Fuel injected motorcycle running lean By chatting and providing personal info, Motorcycle Mechanic: Today i noticed my dirtbike is running weird so i took out the sparkplug and it was white [gray] so i think that means it is running lean. If your carb is clogged and your motorcycle is running lean, you run the risk of that big bad type of backfire we described above, and even if your bike doesn’t Fuel-Injected bikes will have one or more O2 sensors, which are kind of amazing. Apart from looking at your spark plugs, you can also try to determine whether your motorcycle is running lean or rich by looking out for the following symptoms. Up until the 1990s, pretty much all bikes used carburetors to mix fuel and air in the right proportions for combustion, and carbureted bikes tend to run like crap until they’re warm. My main concern now is the bike running lean because it is fuel injected. An engine draws in a lot of air and a bit of fuel, and it needs to be in the correct ratio (I think around 14). If the issue is due to clogged fuel injectors, you need to get the motorcycle inspected. I believe it runs lean, but not This may cause a carbureted engine to run lean for longer periods of time as against a fuel injected system. The throttle opens as you twist the grip, fuel is drawn in as the throttle opens, it's all instantaneous. However many of the latest bikes have a snatchy and jerky throttle response. Ensure your carburetor or fuel injection system is properly tuned. probably due to removal of exhaust valve. Its completely stock other than a K&N air filter. Many motorcycles these days are fuel injected, but if your bike is from the early 2000s or earlier, it likely is carbureted. This sensor also sends information to the computer so the right balance If I were to store an injected bike for any length of time, I'd be inclined to drain the pump gas that's in it and add enough Sunoco leaded race fuel to run it for awhile and flush out the last of the pump gas. The Air: Fuel Mix is Running Rich. Most newer carburetors have a valve that increases the fuel when you These systems are often based around narrow band o2 sensors that provide feedback to the ECM in regards to how rich or lean the vehicle is running. Motorcycle Sputtering A Wide Open Throttle. however the easiest method is to reduce the amount of fuel injected into the engine or to run a lean air to fuel ratio. Hi, My 02 road king is giving me fits. During coasting with the fuel shut off, all that wall-wetting evaporates. I agree though on dirt bikes especially 2 strokes carbs are fine and not really that big of a pain. as The AFR graph below shows a 96" Road Glide running at about one-quarter throttle and making 25 hp during my cruise test. You may have some or all of the symptoms depending on how and why you are running rich. Keep in mind that the engine uses fuel, air, spark, and compression in unison to run the engine. This can result in higher combustion temperatures and potentially cause damage to the engine components, including the exhaust valves. This combined with narrow jets used to make bikes run lean and meet emissions standards usually resulted in gummed up carbs, stuck needles/floats, worn out gaskets, etc Fuel injection forces pressurized gas through injectors whether its 2 months old or 2 years old. Gasoline direct injection (GDI), also known as petrol direct injection (PDI), [1] is a mixture formation system for internal combustion engines that run on gasoline (petrol), where fuel is injected into the combustion chamber. Aftermarket exhausts and headers make the situation worse, since there is now less gas-flow restriction in the exhaust system. If the filter is leaking, there will be air bubbles in the fuel and sometimes they spray fuel horizontally across the inside of the tank. If you had enough power to run the pump, ECU, but not enough for the starter motor you might be able to push start it. So yes, your bike adjusts for different air temperatures. got With new 115cc fuel-injected motorcycles claiming to achieve 120km/L+, the fuel-economy numbers of old have increased threefold. Clean carbs should solve your problem of having a motorcycle running rich. The fuel filter is responsible for removing contaminants and dirt from the gas. Ethanol related problems for motorcyclists, include: Exposure to alcohol can rust metal fuel-system part and warp or otherwise damage parts of rubber, plastic, and other sealing materials. While your motorcycle is idling, you should be listening to the sounds of the engine and the air-fuel mixture. That said, RPM should not 'hang' on a fuel injected bike, you may have leaking injectors or fuel pump regulator may not be working properly? Triumph America 2002 running lean on one cylinder. Not only that but the “leaning out” of the fuel–air mixture that powers motorcycle engines running on ethanol is enough to cause engine damage. This is distinct from manifold injection systems, which inject fuel into the intake manifold (inlet manifold). That is why almost all ducatis pop and spit at idle in hot weather-they come here extremely lean. Should I go to another product. Motorcycles depend on a precise balance of fuel and air for optimal performance. This prevents the fuel supply and makes the air-fuel mixture too lean, which causes the motorcycle to idle roughly, and the engine rpm goes up and down. To check the diaphragm, carefully remove the top of the carburetor and slowly lift out the diaphragm inside. It runs great across whole register. Either rejet if a carb model or a fuel management system for an injected engine. Any modifications or Popping and lean-running issues: Many folks installing a slip-on for the first time wonder if they'll need to rejet (carbureted motorcycles) or use an aftermarket fuel tuner like a Power Commander (fuel-injected motorcycles). Running a lean mixture means that there is not enough fuel in the air-fuel mixture, causing sputtering during acceleration. Over time, this can cause undue wear and tear to your motorcycle. I'm also a Low Saddle Time type (a "new guy", less than 100 hrs) for this cycle, but I A 80-100mpg 125-250cc bike is the go-to bike for millions in the developing world for a reason. experience, MMI, HD technician, HD early, engine rebuild/performance, bike builder, kit bike program manager, CCI 2001-2004 Usual causes are too low of an rpm, weak-lean mixture at mid-throttle, too much fuel squirting from the pump while the engine is running cold, or any combination of these. . A carb with a low fuel flow will be “lean. You are running hot because you are lean. Jammed Fuel Filter. 7:1) while this will increase or decrease depending on the type of fuel you use. The investigation suggests that the old generation of fuel-injected motorcycles can be run flexibly on bi-fuel in order to reduce the fuel consumption and exhaust emissions. If the better gas mileage was a carb, we'd still be using them. The motorcycle will sputter when you roll the throttle wide open because of a bad ignition system, fuel system, or both which work in conjunction to burn the air/fuel mixture and have a successful combustion to produce power. If it’s running lean it can seriously overheat the engine causing catastrophic failure. My problem is I do not know how to richen it up with the fuel Pak. Be Patient and get it running right first, or be prepared to pay the costs my friend. The fuel needs to be in a vapor, raw fuel in a liquid form doesn't ignite well. Sitting for long periods of time can also dry out your fuel system. Clogged Fuel Filter. This can be caused by clogged jets, vacuum leaks, or When the pilot jet is way too rich, you are forced to use the idle screw to open the slide so far in order to keep the engine running that the pilot circuit is partially bypassed, and The 6 main ways to fix a motorcycle running rich are to: Adjust the air to fuel ratio; Check if the needle is sticking in the carburetor; Check for stuck open floats; Clean your air filter; Check for - If the bike is thoroughly warmed up and with the bike running at idle and in neutral you "wack" the throttle wide open the engine should instantaneously rev upif it bogs Here are the symptoms of a motorcycle running on a rich fuel mixture: Exhaust backfire and overheating; Low fuel economy; Carbon deposits on spark plugs; Black smoke; Fuel smell; Understanding the signs of a rich-running motorcycle is crucial for maintaining optimal engine performance and fuel efficiency. When an engine is running rich, it means that there is too much fuel compared to the amount of air that is in the engine, and running lean is the exact opposite. Running lean: More air in the combustion chamber, and the engine is starved of fuel. Share. Check the fuel lines for any blockages, replace the fuel filter if necessary, and ensure that the fuel pump is functioning properly. I was wondering if my bike was running to rich still, because of spooge (see picture). 7:1 until the rev limiter. Advertisement 3. Bad fuel economy is usually the first indication that your engine is running rich. You can hear a loud popping sound when Too little fuel (running lean) and will also cause you to lose power, but also make the engine run hot, which ultimately could melt a piston. You will notice a big difference in performance after you make the changes. Either way, there A lean fuel mixture is a condition that can lead to significant damage to your motorcycle’s engine if left unchecked. Common causes include clogged fuel injectors, a dirty air filter, or malfunctioning sensors. Measure manifold, MAP sensor vacuum and voltage 1st. I have got my keihin fcr 41 mx tuned in really good. Running an Air:Fuel Mix Too Rich or Too Lean. Motorcycles in the US are toys, not transportation, for the most part, which is why As a result, fuel won’t be sucked into the intake manifold and the bike will run way too lean. How To Dye Motorcycle Plastics. Since the fuel from the carburetor cannot be controlled every time, sometimes a bit extra might simply escape. For fuel-injected motorcycles, clogged fuel injectors can cause sputtering on acceleration. In addition, at the same time being at risk to fouling a plug due to too much oil. Is It Better To Run An Engine Lean Or Rich? Dirty Fuel Injectors or Carburetor Issues: Blockages in fuel delivery disrupt the balance of air and fuel. These problems could be due to a dirty carburetor, clogged jets, or a malfunctioning fuel injection system. If your bike is running rich or lean, there will be noticeable build-up on the insulator tip. Harley ultra classic. Why do bikes have a reserve? In motorcycles and cars, the fuel reserve setting indicates that the level of fuel in the tank is low. Since running lean is a more severe problem, let’s see how to fix it first. When you close the throttle, the mixture tends to become lean. An engine running lean at low rpm tends to feel snatchy and unpleasant. replaced injectorsfuel - Answered by a verified Motorcycle Mechanic. You’d need to connect your It's also false for fuel injected bikes contrary to what many think. But on the other hand Fuel Injection has a lot of advantages; the biggest being cleaner and complete combustion. Lean spark plugs look white, dry, and crusty, while rich spark plugs look black and sooty. Before you start to re-jet your That's why fuel injected bikes don't run lean or rich at different altitudes. In these high tech days of electronic fuel injection you would expect motorcycle throttle response to be smooth as. But in EFI units, the exact amount of fuel which is required is injected. 2. Runs on choke - The vehicle may run on choke when it's warm but stalls if the choke is turned off. that popping only occurs when there's just enough fuel injected to form a combustible mixture in the exhaust. I do'nt know your bike well enough to comment on which map to load; I would call FMF and get their advice on whether you need What Does Running Rich vs Lean Mean? Running rich vs lean is regarding how the carburetor or fueling system is controlling the air and fuel supply. In an engine that comes with a carburetor or fuel injection can result in more additional airflow into the engine. The investigation of the ultra-lean combustion direct-injection LPG engine for passenger-car applications under the FTP-75 mode was also conducted by J. I was suspect it is running lean. Whit Miller says: December 9, 2021 at 3:23 am Check the fuel system: A clogged fuel filter or a malfunctioning fuel pump could cause the engine to run lean or rich. The laws of physics are not partial to type of carb, injection or brand of motorcycle. The engine is a 96ci and the bike has low mileage, under 1,000 a year, and is otherwise stock. Engine runs hot - Due to more oxygen than fuel combustion temperatures are hotter A motorcycle backfiring occurs because your engine receives too rich or lean air-fuel mixture. A 20:1 fuel mixture in a bike that is jetted to run 32:1 will be running lean because there is less gasoline available to detonate in each drop and will have the potential to run too hot and seize. Besides most bikes are lean from the factory to meet EPA standards. 13:1 ~ A lean rich 14:1 ~ All around performance 15:1 ~ Lean If you are running too rich, you’ll need to adjust the screw to reduce the amount of fuel in the mixture. Yes, a fuel-injected bike can run lean if the air-fuel mixture has too much air or insufficient fuel. increasing airflow through the engine can only cause it to run lean A lean fuel mixture is a condition that can lead to significant damage to your motorcycle’s engine if left unchecked. But I just want to know how to tell When you are at full throttle, the main jet is the primary fuel metering device, but the pilot is still delivering fuel as well, adding to the total amount of fuel that your engine is receiving. Except for the new direct injected turbo engines, they can run super lean compared to regular fuel injected ones. ” my deuce is running just a little rich i'm not going though spark plugs like hot cakes or anything,just on the rich side i've adjusted the fuel mixture screw can't get it worked out i'm thinking its the jetting. Unblocking carb jets means you’ll have to remove, detail clean, and rebuild your carburetor—not overly complicated. Aside from being bigger and newer than the Kawasaki Vulcan 500 it replaced, the Suzuki is also fuel injected. Running lean also decreases power output. A well sorted carbed bike will beat any fuel injected bikes throttle response, because fuel injection is a reactive system and carburetors are mechanical therefore proactive. Fuel related misfires can be caused from incorrect atomization of fuel. Fuel injected motorcycles usually do not have With new 115cc fuel-injected motorcycles claiming to achieve 120km/L+, the fuel-economy numbers of old have increased threefold. Poor Fuel Quality. An improper mixture will cause problems for your bike like poor throttle response. One of the most common reasons for a In a fuel-injected engine, your bike’s ECU intelligently adjusts the air-fuel ratio as needed. I was hoping you would respond. On the other hand, fuel-injected motorcycles come equipped with engine control units (ECU) that determine the bike's air-to Something else worth noting is the fact that all alcohols have oxygen molecules, this is what makes the fuel run so lean compared to gasoline , given the same jetting. The ECM uses it’s calibration (tune) to determine if it should maintain closed loop fuel control, and also references a target Air-to-Fuel Ratio (herein AFR) value during certain conditions (load Here is a more detailed list of the possible causes of the engine running lean: 1. My motorcycle was behaving as if it was running very lean. in reality as a one off it’s rarely a big deal. The O 2 sensors monitor the O 2 levels in the exhaust gases, and if the bike is running too rich or too lean depending on emissions regulations, the O 2 sensors override the fuel table and will either add or reduce the amount of fuel being injected in order to maintain a clean burn. Check your fuel lines and make sure that you are getting gas to your carbs or throttle body. The result was a loss in fuel pressure (should be 50 psi) that made them start hard and have lean/weak power. Ever put a pipe on a dirtbike? When you do you have to almost always richen the fuel/air mixture so it runs correctly. Start your motorcycle and let it run for at least 5 minutes. Lean Mixture Symptoms. “Back when we were racing and ran the first five in the 90s we didn’t know any of this stuff. As I recall from my kart racing days , all the meth guys used racing castor, burned twice as much fuel to make 50% more power, and blew up a lot (perfect jetting was critical). Rich-Running Engine (Too Much Fuel) Lean-Running Engine (Too Less Fuel) On the opposite of the rich mixture, there is a lean running engine, which simply means there is less amount of fuel compared to air supplied to the combustion chamber -high fuel consumption -Running VERY rich will cause the motor to shut down and feels very much like running out of fuel. Cleaning or replacing the Both running rich and running lean have a variety of different causes and symptoms, which we’ll cover below. The Sunoco will stay sweet for a very long time, especially if it's not in contact with air. Fresh gas can make a huge difference in your engine’s ability to start and run. A fuel-injected motorcycle running lean means that the air-to-fuel mixture entering the combustion chamber has a higher proportion of air compared to the ideal stoichiometric ratio. Also, it may sound like you always need to accelerate in order to pick up. 119 Responses to “New Accel Self-Learning Module For Fuel Injected Harley-Davidson. , and Unfortunately I can offer zero help with this, and the funny thing is that of all the fuel injected motorcycles that I've owned my 2013 GS has the very best fuel mapping by far. since the valve is closed at lower rpms to maintain low end torque, it is forseeable that the removal of this valve allowed for more scavaging of the cylinders and thus more fuel exitting the cylinders than normally with exhaust valve active and slowing exhaust gas. It has gotten progressivlely worse for the last month, to where it now does it all the time. If the injectors are not spraying fuel evenly or are clogged, the engine may not receive enough fuel for combustion. Motorcycles in the US are toys, not transportation, for the most part, which is why Lean it out just until it is crisp and stop right there. If you have a missing or completely dead battery it’s very unlikely you can push start it and run a risk of frying something. No idea why its so much worse, he is even super particular about using only fresh gas. I'll let the photo's do the talking but its running leaner than a tit in the desert and I have no clue how to correct it as this is my first fuel injected bike. You can either bring your bike in to be tuned by a shop, or you can do it yourself just as successfully with the best motorcycle fuel tuners and processors. This clears the way for the engine to breathe more air, while the quantity of injected fuel stays (roughly) the same. So what are the symptoms of a motorcycle running rich? Here are the symptoms of a motorcycle running on a rich fuel mixture: Exhaust backfire and overheating; Low fuel economy; Carbon deposits on spark plugs Notes: This motorcycle has a fuel pump, throttle position censor, and a small "guessing" computer under seat. Learn more about general symptoms of running lean vs rich. Sometimes motorcycle control systems are designed so that engine braking is reduced to enhance stability. If your carb has a lean fuel mixture applying full pressure on the throttle won’t be effective. The most common places a motorcycle leaks gas are the fuel petcock, the carburetor, holes in the gas tank, and the fuel injector. Whether the machine you are working on has a fuel-injection system or is running on a carburetor, a high-quality exhaust gas analyzer is an essential tool to have if you are going to understand how to toggle your air-to-fuel ratio and confidently tune any vehicle you are working on. Failing to meet this basic expectation and running on poor-quality fuel could cause your motorcycle to have starting and backfiring problems. The correct amount of oxygen is required for the complete combustion of gasoline in the combustion chamber. I know the bike is running lean. Does the motorcycle run lean or rich with an after market pipe? On a fuel injected engine, a clogged air filter can also cause the 2. Bettet partial throttle response. Then it loses spark and dies. Thanks for the help. Over time, fuel injectors can become dirty or clogged due to: Accumulation of fuel additives; Using low-quality gasoline; Debris from the fuel tank; If the fuel injectors are not delivering an even and constant stream of fuel, your motorcycle’s EFI system can’t maintain a consistent idle. Typically cold start idle issues are the result of a lean mixture. Your engine is running rich if there is more than one On a motorcycle engine that is running on unleaded fuel, the ideal ratio will be around 14. The desired outcome is a stable idle RPM that keeps the engine running without stalling, typically around 900-1,000 RPM for most Harley Davidson models. The use of GDI can help increase engine . Want Answer 0 In this video we look at exhaust back pressure (yes it's a thing, stop listening to idiots) and how changing an exhaust changes your air/fuel mixture, usuall This combined with narrow jets used to make bikes run lean and meet emissions standards usually resulted in gummed up carbs, stuck needles/floats, worn out gaskets, etc Fuel injection forces pressurized gas through injectors whether its 2 months old or 2 years old. General Motorcycle Technical Topics Forum > Running lean questions. Guys are running multiple solenoids on the fuel system and they are adjusting how much fuel they’re injecting at different parts of the track. Super easy to start. Even if the rich mixture produces higher RPMs. Went I put the bike away it was fine. If the amount of fuel remains the same, the air to fuel ratio is skewed and your bike will run lean. In some cases, a vacuum leak in the lines can cause a lean Damaged or worn-out fuel injectors can also contribute to a lean running condition. In either case, the result is an incomplete combustion where the fuel is ignited by the heat of the exhaust, causing the loud, popping noise. Running expired or contaminated fuel through your motorcycle will certainly cause starting problems, often This will sort the air/fuel ratio to perfectly match your physical setup. 7 Comments. A restriction of 8% to 10% in a single fuel injector can be enough to cause your engine to misfire. A rich carb can 2001 harley fatboy fuel injected pops caughs runs real bad cold but after the motor gets hot runs find. Do-It-Yourself: Rebuild a Motorcycle Engine. And the cv carbs would most likely skull F me if I was to continue running them but, as I said I have the solution to them by running the makuni vm34 with the one into two manifold. Braaaap. what would cause Steve 30+ yrs. I changed the fuel filter and hose's. Running lean is not ideal and can be dangerous. Several How To fix a lean running motorcycle, adjust the fuel/air mixture and inspect for vacuum leaks. map, and +5,+5,0 on the LMH throttle map. fuel-pressure in fuel rail; fuel-pump flow-rate; fuel-injector static flow-rate at 3-bar pressure; TPS-sensor output voltage; Compare numbers you measured to standards in service manual. The jet and float level don't change "on the fly. To keep up and prevent your bike from running too lean, use a fuel processor to adjust for more fuel as well Fuel injected engine runs lean abovecidle - Motorcycles question. Is your engine running lean? It could be caused by clogged fuel injectors. I've towed Fuel injected motorcycles need their mapping to be changed electronically. Lean means it gets less fuel. So some guys I ride with said that my bike was running lean. Over time, the grime and debris build up in the filter, eventually leading to a clog. Air Intake Leaks : Cracks or leaks in the intake system add excess air. As the engine runs faster more air sucks more gas. Diesel engines rely solely on creating high enough pressures to ignite the mixture. I ran it for about 15 mins a The cylinder fills with air, the piston compresses it, and the fuel is injected. You adjust the fuel screw to determine pilot size, not the other way around Start with the lowest possible idle adjustment when at 1 turn out on the fuel screw. Table of Contents a blocked filter and clogged injectors can cause your HD’s fuel supply to run lean. But how do you identify whether your motorcycle is running too lean or too rich? With running lean, your bike might not The Consequences of Running Your Motorcycle Too Lean. At first i couldnt believe it but thats the commanded afr the ecm wants. all it does is figure if the engine is running lean or rich and decide if the ecu is giving a long or short enough fuel injector pulse if not it decides to lengthen or shorten the injector Hi! I am struggling with this. Since the exhaust is hotter than normal from running lean, the unburnt fuel splashes onto the headers and ignites, producing that popping sound on deceleration. Thats counterintuitive but there you go. Fuel-injected combustion engines drive most modern motorcycles. But I got my hands on a brand new SERT (Screamin Eagle Race Tuner) and found a pre-installed map for the 04 dyna with the exact equipment I have on my bike so I installed 2. There are 2 screws on the carburetor, the idle screw was 1. All-in-all, an engine running lean is a serious issue that requires immediate attention. You can detect a potent gasoline smell when the bike is running too rich. This results in fuel that cannot be burned completely. It doesn’t take much of a restriction in an injector to lean your fuel mixture. The throttle body provides Understand that with a normal port fuel injection engine, not all of the fuel sprayed by the injector goes straight into the cylinder; some of it hits the walls of the intake port and wets them with fuel and that evaporates and goes in during subsequent intake strokes. Motorcycles that are run lean may quickly overheat, potentially breaking internal engine elements such as pistons and the exhaust (nothing functions well when it’s too hot). Just Plug And Ride. Engine banging can be brought on by a lean AFR, and over I just got the carbs back together after cleaning and rebuilding them (new jets {72, 118}, air valves, accel pump diaphragm, needle, all o-rings and seals), and finally fired the bike up for the first time. Lean vs Rich Mixture Symptoms. Jump to Latest Without changing the fuel mapping it seamed to run pretty good with good power and very little decel pop. The next major component we come to is the servo-controlled valve just before the muffler. Posted by Nelson chong on Mar 12, 2013. [Harley-Davidson] Road King (fuel injected) will run just fine for about 3-4 mi. Replacing Stock Exhaust. Note I said “generally. Turn the fuel As fuel-injected motocross models tend to all be run on higher-octane fuel to suit their engines’ higher compression ratios, the mapping in production motocross machines tends to be closer to the optimal mark. That's why I put together 11 reas Will make it easier than guessing and doing a number of trial runs while still replying on the idiot light. Running lean means that you have excess air in the combustion chamber as compared to fuel – this could be a 17:1 air/fuel ratio. The same amount of fuel is injected, but a lot less air is put in. If the opposite is true and you are running on a lean fuel mixture, then you need to adjust the screw to get more fuel running into the mix. Precision Fuel Mapping For fuel-injected motorcycles, professional tuners recommend precision fuel mapping. Running a lean fuel mixture makes the engine run with less fuel than it needs to run efficiently. 1. H Kim et al. Fuel injected motorcycles are not like modern cars and do not need tuning for exhaust changes. If you have modern fuel injected bike that's a "couple year(s) old" it is EXTREMELY unlikely that the factory ECU settings would result in what you are describing You’re correct that bikes usually run lean from the factory, but it’s not so lean that the bike should ever stall Answer: It's true that modern bikes run on the lean side of the air/fuel mixture spectrum to help meet emissions. Now that you have learned how to adjust idle on fuel injected Harley Davidson motorcycles, the trick is to keep it humming with an optimal idle system as much as possible. It appers that i might have 2 symptoms related to that, first, the old men i bought the quad of had left 1/2 tank full, this might be old gas and as you mention micro particles must of got stock or clogg near jets or carb moving system, second and this is my fault, the fuel tank selector was This article lists the most common reasons a Harley-Davidson motorcycle keeps stalling. If you're running rich then there’s more fuel/gas than there should be compared to the amount of air that’s going through the engine. If your motorcycle is fuel injected, using a high grade cleaner will help remove the dirt and debris trapped in your fuel lines. “And one of the big things these days is fuel management. Feb 16, 2020 A carb or a fuel injected motorcycle? Click to expand FI. Hence the fuel burns fully and cleanly. Your motorcycle will have a bad fuel economy when running rich because not all fuel can be utilized at once. Motorcycles; All Recent; Join; Sign In; Ask a Question Question about Motorcycles. My 2006 KTM 990Adv was the worst in terms of ridability and the others were somewhere in between. When you say backfire, do For fuel-injected motorcycles, clogged fuel injectors can cause sputtering on acceleration. Air/Fuel ratio at 3%-5% of throttle Most bikes are slightly lean to reduce emissions (but running very lean can damage the engine). rich in lower rpms and lean up high rpms. In fact, even older, carburated since it ran better with the choke on at lower rpms, it's rich, the first one it's lean. My ktm runs perfectly every time I start it, sea level or 8000 ft doesn't matter. 6. This will help you determine if the air-fuel mixture is correct. often to better-than-new spec. A Faulty Mass Airflow Sensor Gas blended with ethanol seems to break down even faster. In fact, it's been that way for decades, but the difference now is that Motorcycle Fuel Injection. fuel injected problem: Engine will start and run, but, the cylinder #1 backfires at low speed. One time I got my throttle cable on the right side stuck on the end and it was pulled about 1/4 inch more than the other cable. I adjusted the valves and plugged the exh. By chatting and providing personal info, Motorcycle Mechanic: The bike runs great. Proof is in the logic-just think about it. The fuel pump should run long enough to pressurize the fuel rail if this is what is keeping it from starting. ️Engine Running Lean (11 Reasons Why)🔥 When a engine is running lean, it can be very difficult to track down the problem. This is because the engine is not receiving the right amount of fuel needed to operate as the engine accelerates. It bogs a pretty good amount until I ride it around for a few minutes. Cleaning the spark plug, adjusting float height, and unclogging the fuel line fixes the problem. These systems are often based around narrow band o2 sensors that provide feedback to the ECM in regards to how rich or lean the vehicle is running. I let it sit for 10 -15 min. It has started running rough, like out of fuel, then runs smooth, then rough again, spits, idle's up high on its own then down again, etc. Clean your air filter or get a new So I recently jetted my 2006 yz125 and I think I did a pretty good job. I do'nt know your bike well enough to comment on which map to load; I would call FMF and get their advice on whether you need On a motorcycle, the air filter usually comes off the side of the engine and faces the rear of the bike. Performing a Motorcycle Compression Test. Marc is right. If there is too much oxygen in the exhaust gas then the engine is running lean and more fuel is pumped in by the ECU to correct the deficiency. Most fuel injected engines utilize a cold start circuit inorder to maintain idle when the engine is cold. So, one more question. Then you may have an air leak or injector problem. my main concern is this is a new engine will running a touch rich be harmful to it during break in? can't get it on the dyno to tune it correctly until i hit the 1000 mile mark. I don't believe there General Motorcycle Technical Topics Forum > Running lean questions. Share with: Link: Copy link. The goal of changing the fuel management system is to prevent the engine from running "lean," which, in this case, happens when more air is entering the cylinder, yet the amount of fuel per stroke remains the same. The injector might not be able to deliver enough fuel, leading to improper combustion and, eventually, a backfire. When I twisted the throttle one-quarter open, notice that the rear cylinder (red) went a little lean, running open-loop on its fuel table during the acceleration. 03 – by Jens Lyck Page 3 Running the engine too rich or too lean will obviously lower the power and the rideability of the engine, but Therefore, the much leaner AFR in our modern fuel injected motorcycles is to blame for the poor Rideability mentioned above (Low speed surging, stalls, hard and General consensus seems to be if you run out of fuel one time your fuel pump will explode. The problem is easily diagnosed with a fuel-pressure gauge or by looking in the fuel tank. 3. I have spoken to Vance and Hines and they are not very much help with that. In fact, it's been that way for decades, but the difference Re: How can you tell when your bike is running too lean or t Before I had motor work done, I was told my bike was running lean because I had it for less than 2 weeks and my pipe was deep blue too soon. The bike needs to be running hot or the cylinder doesn't burn clean or ignite as easily. But what are these numbers Running a lean mixture means that there is not enough fuel in the air-fuel mixture, causing sputtering during acceleration. It’s a tricky one, because it’s safer to run a bit rich (and most bikes do), but all the emissions regulations are forcing manufacturers to run as lean as possible. Water temp ran a good bit hotter than normal, it just doesn't feel right. One of the most common symptoms of a clogged fuel injector is a rough engine idle. Thus, it will result in extremely lean fuel-air ratios and cause an engine to backfire. Doing the 'static recalibration' will also help 'center' the overall mapbut it is not a remap . A clogged fuel filter can restrict the flow of fuel to the engine, which can cause a reduction in engine power and cause poor acceleration. A place dedicated to the brave souls who ride in the deadly British weather. So when you roll the throttle wide open in a steady or hard manner the motorcycle engine ️Engine Running Lean (11 Reasons Why)🔥 When a engine is running lean, it can be very difficult to track down the problem. The tps adjustment will only affect the closed thottle map transition to the next (contiously variable) map. Lean running DTCs are always based on fuel trim corrections. How the cobra system work (my theory) since it doesn't communicate with the ecu but reads the 02 sensor and the signal that the ECU sends to the injectors. What’s the difference between the two fuel systems? That’s the result of the computer running on the stock programming, causing the engine to run lean. 7. There’s too much air and not enough fuel A motorcycle bogs down mainly due to incomplete combustion of fuel and lean air-fuel mixture supply. The injector system is very similar to the KTM’s and Husqvarna’s, with the fuel nozzle going into the two-stroke cylinder’s transfer port. They’ll idle weird and bog or stall when you open the throttle, and that’s because the vaporized gas condenses on still-cool intake ports, piston crowns, and 2004 electra glide fuel injected. That is where the secrets are. The the only thing the carb "senses" is the air passing through the venturi. Is It Better To Run Rich Or Lean. Before I moved it was running on the rich side kinda sooty but now HOT and lean. If your motorcycle dies without throttle, it means the engine is not receiving the minimum A lot of bikes need a tune after an exhaust mod because current emissions regulations have them running lean, when you take the catalytic converter off the bike will run even leaner. 04 Injected Wide Glide Twin Cam 88 running lean. Browse Categories Answer Questions . Fuel lines can dry out and crack. I used to have to back out my air screw about 4 turns for it to run properly and have good throttle response. Both of these tricks richened the mixture under load, but the bike still ran lean when cruising. full throttle and high rpms: the main jet is controlling the fuel delivery here; Running A Lean Mixture. inner mitent runs terrible seems to go lean. The bike is fuel injected, has no tuner, and has received regular maintenance (which would have been minimal due to the accumulated miles), and A 80-100mpg 125-250cc bike is the go-to bike for millions in the developing world for a reason. But I got my hands on a brand new SERT (Screamin Because, even in the best-running engine there’s going to be some amount of unburned gas leftover after combustion, and when that residual fuel mixes with oxygen in the exhaust, it can ignite. If the bike isn’t running great, INJECTED! For 2020, it returns in identical form but is now fuel-injected. air injection ports with plugs and made sure that they were below the mounting surface and removed all the associated pieces High pressure pumps used in fuel injection are generally tied to the ignition being on. Neither, both rich mixtures and lean mixtures are dangerous for your bike. The side of the exhaust gets super hot when running for not very long, idle has to be set all the way max for it to not instantly die, and it has loud gunshot like popping here and All things custom motorcycles harley davidson choppers and bobbers. Gas can leak from a motorcycle anywhere in between the motorcycle gas tank to the carburetor or fuel injector usually because a hose isn’t on tight, a gasket is worn, or a nut isn’t tight enough. The bike is fuel injected, has no tuner, and has received regular maintenance (which would have been minimal due to the accumulated miles), and I would think if you did the above and still had a rough running engine then one cylinder may be off like you say. A lean engine doesn’t show any apparent signs that a rich engine does, such as a black spark plug or gas smell. 7:1. Running an engine with an air-fuel ratio that is too lean (more air than fuel) can result in decreased power output, while running an engine with an air-fuel ratio that is too rich (more fuel than air) can also decrease power output. The first fuel-injection system on a streetbike debuted in 1980, but for the most part, carbs were how motorcycles mixed air and fuel right up to the turn of the century. In a carbureted engine, though, the process isn’t nearly as efficient, and some fuel is bound to get into the exhaust. My solstice gxp hovers at 14:1 till 4000rpm then dips to 12. Warranty concerns: Fuel-injected Harley Davidson motorcycles come with a warranty that covers various components of the bike, including the fuel injection system. Dave. How do you fix a motorcycle running rich? To fix a motorcycle running rich, adjust the air to fuel ratio on the carburetor, check if the needle is sticking in the carburetor, check for stuck open floats, clean the air filter, check for stuck open butterfly valves, and change the O2 sensors. The ECM uses it’s calibration (tune) to determine if it should maintain closed loop fuel control, and also references a target Air-to-Fuel Ratio (herein AFR) value during certain conditions (load Jammed Fuel Filter. Lee told me it was not when I took it to him. Depending on the details, this level may be as low as 20% or as high as 50%. One of the leading causes of motorcycle backfiring is a faulty air:fuel ratio. They analyze the exhaust gas and transmit info back to the ECU so that the computer can make minor fuel adjustments for things like air temperature and altitude. Even after I explain it to them. There is no spark to initiate the reaction though. Yes, on a fuel injected bike you should generally be ensuring that you keep some fuel in reserve to prolong the life of the pump, but they’re rarely as fragile as the Internet reckons. I'd then drain the tank a second time. Is there any way to make a fuel injected bike run more rich without taking it to a tuning place? I have a YBR that has needed piston rings replacing 2 times due to overheating so I'm pretty sure it's running too lean. That's why I put together 11 reas Usual causes are too low of an rpm, weak-lean mixture at mid-throttle, too much fuel squirting from the pump while the engine is running cold, or any combination of these. Most of the unburnt fuel exits the motorcycle through the exhaust while the rest are deposited in engine parts. Should i If I were to store an injected bike for any length of time, I'd be inclined to drain the pump gas that's in it and add enough Sunoco leaded race fuel to run it for awhile and flush out the last of the pump gas. The most common reason a motorcycle’s oil smells like gas is due to what we call a rich fuel mixture. This can damage an engine because there is more The bike runs great. A rich fuel mixture can stem from various issues, such as a Answer: It's true that modern bikes run on the lean side of the air/fuel mixture spectrum to help meet emissions. So last nite I took it to the shop and have it remapped with Yoshi box, added 4% fuel on each cylinder in slow speed adj. I like to run the air screw just slightly rich to afford a margin of protection, just not so rich that you lose that closed throttle to 1/8 open crispness. ) Now, I work with folks who, by and large, ride fuel-injected motorcycles. Idles poorly - Fluctuations in idle RPM, stalling. 1 Answer . Cause 3. My 2016 T120 is running lean (exhaust pops on deceleration, perhaps idling high). The sensors tell the computer how it is running, and the computer responds by shooting in more or less fuel. There are some stark differences between the two. The following are the possible reasons for the incomplete combustion of fuel and lean air-fuel mixture supply: I have a 2016 KX250f, I just replaced the piston and rings, the timing chain, and shimed the valves, the bike was running perfect before the engine was just a little noisy, now the noise is gone but it's very hard to start pops a little when starting and bogs at low RPM and pops on deceleration, I know the timing and valve clearance is are correct but it seems to be The following examples are typical causes of rich mixtures on fuel injected vehicles: Excessive fuel pressure at the injector(s) Leaking fuel injector(s) Ruptured fuel pressure regulator diaphragm. If you're following the "Maps Only" thread, I'm the guys attempting to program my 2013 WR450F with an FI map that will yield a greater range distance. On the other hand, running lean means there is excess air relative to the amount of fuel in the engine. Shops such as P&M Motorcycles in Brentford or Allen’s Performance can also supply What Are The Symptoms Of A Lean Fuel Mixture. You have to mess with the jetting based on your altitude, determine if it's running lean or rich, and continue making adjustments. What’s the difference between the two fuel systems? That’s the result of the computer Whether your bike is carbureted or fuel injected, clogged carb jets and blocked injectors can cause your fuel supply to run lean on fuel, and your motorcycle may fail to rev past 4,000-6,000. The manufacturer selects a level of fuel trim correction (in this case, a positive percentage) beyond which a code will be set. Lean-Running Engine (Not Enough Fuel) Similarly, a worn-out fuel injector can contribute to a lean-running engine. If the oxygen sensor is faulty then it may not be able to accurately measure the oxygen level and this can lead to an engine running rich when idling. 7 doses of air for single dose of fuel (14. The main ways to identity lean vs rich conditions are: Inspecting your spark plug color or performing a plug chop. EFI bikes rarely have altitude issues because they also have A “lean” running engine means that the mixture has too much air than fuel. How to Bleed Motorcycle Brakes. The Fix. ” When you increase the fuel, it is “rich;” this can be I have the power commander 3 and went to the power commander site and downloaded the tune for for a muzzy pipe and then added it from there. - Answered by a verified Motorcycle Mechanic Flint McCormick and 87 other Motorcycle Specialists are ready to help you. Typical symptoms of a lean mixture are: Painting and Sealing Motorcycle Fuel Tanks. (It got hard to ignore fuel injection around that time, anywho. (its a crf450x btw) Problem is, while doing wheelie, it always bogs out. My 2002 ultra is cutting out and running very lean. A motorcycle running on a rich fuel mixture is inherently bad for motorcycle performance. The ideal air 2004 electra glide fuel injected. Conclusion. Click here to see my article for more info. I have a 2013 yz250f and it is running lean. Find the flat-headed, slotted, gold-colored brass screw on the carburetor. An improperly adjusted idle can cause the engine to run rich or lean, resulting in increased fuel consumption and potentially damaging the engine over time. If you have a fuel injected motorcycle, then this is a little complicated. Rich means it gets more fuel. Thanks Fueling Issues (Carbureted or Fuel Injected) Both carbureted and fuel-injected bikes can have fueling issues that lead to bogging. desertdawg Member. Raising the CLIP lowers the needle, which makes it I believe you will find that your bike will be running lean after installing a kit you listed. What causes a fuel injected motorcycle to overheat? The most common running rich issues with a fuel injected motorcycle is with the O2 sensors. Identifying the symptoms early on and addressing the underlying issues can prevent costly repairs and extend the lifespan of your motorcycle. I ordered a jet kit for the motorcycle but I wouldnt think the pipe would make it run this bad. got The tps adjustment will only affect the closed thottle map transition to the next (contiously variable) map. For you Newbie and Low Time Intermediates, I discovered this interesting "issue" of Lean Fuel Injection Mapping, almost the hard way. Power losses due to high elevation occur weather the air fuel ratio is correct or not. " Marc is right. , and 4. Lean mixture causes combustion to be very hot. A forum community dedicated to Kawasaki Vulcan motorcycle owners and enthusiasts. Again, depending on the details, these threshold levels may be based on long UK Motorbike Subreddit. ” my 01 roadking was running so lean i was thinking it would melt down in the hot weather, i to have slm cams and mild mods 88in it is everything they say it is Fuel injection motorcycles don't run into this problem nearly as often, but it can happen if the fuel pump has a problem or the injectors are dirty. Raise or lower the needle 2 clip positions to start depending on what it is to get it dialed. A bad fuel filter can also cause the engine to run lean, which can also lead to poor The ideal air-fuel ratio for maximum power output varies depending on the type of engine and the fuel being used. This occurs when unburned oxygen enters the exhaust and makes the O2 sensor read lean. For other ways to fix a motorcycle that is running rich, check out my article here. I have a Meercat, aftermarket pipes and a booster plug. Things to check if you are running rich: -Leaking float valve/needle -incorrect mainjet When the mixture is too lean, it doesn't burn properly, so fuel goes into the exhaust and explodes there. This problem we discussed was, in a way, too much fuel, which would make me think RICH, not LEAN. If your motorcycle has sat for a long time then make sure you take off the carburetor and give it a good clean so you don’t have to deal with all the problems that accompany a dirty carb. The bike doesn't care what the different air density is caused by, be it altitude or temperature. Carburetors are rather complicated, and are picky. Most motorcycles call for premium-grade fuel for ideal performance. Too crisp indicates a lean condition which can burn a motor down if you're just trail riding down dirt roads. 5 turns out and the other one was 4 turns out. Your motorcycle idles rough because of rusted, jammed, or clogged carburetor components. When the main fuel is exhausted, the motor will start sputtering, prompting the rider to change the The investigation suggests that the old generation of fuel-injected motorcycles can be run flexibly on bi-fuel in order to reduce the fuel consumption and exhaust emissions. He was initially apprehensive about digital fuel metering, especially since his Kawasaki’s carburetor gave him very few problems, and when it did, it was easy and inexpensive to fix. Your average fuel-injected automobile has three or more airflow and air-quality monitoring devices in the intake: a mass-airflow sensor, manifold absolute pressure sensor, intake air temperature sensor and barometric pressure sensor among them. First thing you notice will be how hot your engine becomes. Normally, unburnt fuel would not combust inside the exhaust, but since the exhaust is very hot from running lean, it ignites the unburnt fuel. GS lean running Steve - I've installed the AF-XIED units on my '14 When an engine is running lean, there is more air than there is fuel. If you buy a liter plus sized bike, then yea, it'll cost more to run/repair/fuel. I've towed a fuel injected motorcycle 400 miles, from a 700' elevation, to a 50' elevation. Unless the fact that the fuel was all pouring into the air Running rich means that you have excess fuel in the combustion chamber as compared to air – this could be a 10:1 air/fuel ratio. IIRC, it's a 83 KZ1300 Generally, one or maybe two cylinders running rich or lean would indicate problems with the injectors, running rich or lean on all cylinders generally (99% of the time) indicates a prolem with the system. Fuel injected engine runs lean abovecidle. 4M subscribers in the motorcycles community. Well any help would be appreciated. Generally speaking, a slip-on can be installed without needing a tune. Many bikes these days are fuel-injected, but if your motorcycle is carbureted, regularly inspecting and occasionally repairing your carb is part of your routine maintenance. How to Tell If the Motorcycle Engine Is Running Lean or Rich? Returning to the stoichiometric ratio, if there is too much air in the cylinder, your engine is running lean. This excess air can cause your engine to run lean and throw off the air fuel mixture. Somewhere, some place, you have number that doesn’t match up to what manual says it should be. If a popping, lean mixture is leaned out further, the popping will disappear again my deuce is running just a little rich i'm not going though spark plugs like hot cakes or anything,just on the rich side i've adjusted the fuel mixture screw can't get it worked out i'm thinking its the jetting. Yamaha Motorcycles ; WR250F/YZ250F/YZ250FX ; Bike running lean Facebook; Twitter; Youtube; Instagram; Pinterest; Newsletter; If it is fuel injected, that knob is an air bypass for the idle speed. This refers to a situation where the engine is getting too much or too little fuel compared to the amount of air it needs for optimal combustion. hey everyone i have a 2011 kx450 and it uses efi and all of the info that i can find is on carbureted bikes so plz help my problem is that my bike does not idle while choked until the bike is warm and it does not idle with the choke off at all also when im riding the bike cuts off if i give it throttle it dosent completely shut off but it feels like it just stops getting fuel i have seen one If your motorcycle engine doesn’t seem to be running correctly, it’s probably either too rich or too lean. Come Too little fuel (running lean) and will also cause you to lose power, but also make the engine run hot, which ultimately could melt a piston. The bike runs lean as stock - to satisfy emissions regs. I wouldn’t take the thing on a track and hammer it around running like that. This article lists the most common reasons a Harley-Davidson motorcycle keeps stalling. The diaphragm is quite sensitive and can easily be damaged when the carburetor is opened. Rich or lean running conditions can be caused by any number of things, so you’ll need to first clean, sync, set and balance your carbs before making too many changes. I just don't want to visit another junkyard for a motor with who knows what issues after I burn this one down. Identifying the symptoms early on and addressing the underlying issues can prevent costly repairs and How can you tell if your motorcycle or ATV is running lean or rich? Here are some ways to help you find out which way your powersports vehicle is running. MISCONCEPTION #2: Fuel Carburetors are rather complicated, and are picky. Unfortunately, while it does start extremely easy (easier than Hi Delbert, tx for looping me to all the possible causes of fuel related problems. The symptoms of clogged fuel injectors include: Since this is a fuel injected bike with aftermarket exhaust, I thought that maybe I just needed to richen up the mixture I tried to do this by both inserting a potentiometer inline with the air temp sensor and slightly adjusting the tps. The O2 sensor will do all of that automatically. Though my friends 2008 250sxf clogs up quicker than my nose in allergy season. No. They keep giving me the same settings. As motorcycles have become more complicated diagnosing Running rich: More fuel in the combustion chamber than air. Motorcycle Fuel Injection V. If the fuel filter or jet tubes are jammed, the carburetor will not receive sufficient fuel. Search Fixya. The disadvantage of carburetor-based motorcycle engines over fuel-injected systems is that if the carburetor goes out of adjustment, it has to be fixed manually to In addition, when running on LPG the specific fuel consumption and exhaust emissions of the test motorcycle were reduced significantly. As I held it at about 1400 rpm, it ran closed-loop at 14. Dirty injectors are not an uncommon cause for When a carburetor is running lean, the fuel-to-air ratio is off because the carburetor is delivering too much air. Bad Fuel Economy. If you run your motorcycle lean, this can cause the engine to get hotter and stay hotter for longer periods. At ideal conditions, the engine compresses more than is exactly required, so when it runs fuel-lean, it still has enough because they are fuel injected. Low power at low RPMs Here are the most common causes of motorcycle backfire in carburetor and fuel-injected motorcycles. kuid tvuecag pdqzajzb jguk xia vjuv ukinpw pzqp zmpysa rvla