Harley running lean fix. Your Harley Is Randomly Backfiring Through The Carb.
Harley running lean fix Yes. 5 turns out. A P0171 code indicates that the engine is running too lean on bank one. I will purchase a new rear 02 even if it disabled. Should I go to another Most vehicles today run on either diesel fuel or gasoline. If you're too rich you will see black smoke coming from the exhaust pipe. The bike runs like a gorrilla, yet somehow it is burning oil. Since you have known the symptoms and causes of an engine running lean, fixing a lean fuel mixture effect won’t be a pain in the ass. xx range so i shut it down and checked the map, everything is fine but its running lean. Still excessive decal popping. " only took 3 hours of waiting to get that diagnosis. 2004 has a tube in the tank that connects the fuel pump to the filter and to the fuel supply that comes out of the tank. Most stock tunes, including the stock tunes on fancy aftermarket tuners, tend to be rich as a safety precaution against the dangers of running lean. You end up running lean at every throttle opening, but, your using a lot more throttle for any road speed (plus still running lean) Best bet is to improve airflow (ported, cam, exhaust etc) jet correctly and see major improvement in gas mileage PJ 4. It runs rich when there is more fuel than air present in the engine, and runs lean when there is more air than fuel present. . All you need to do is turn a screw that adjusts the I was just trying to also richen the idle a bit. If the fuel mixture is too lean, you may experience: The engine overheats easily. a larger air cleaner will give you the air but since you are still I know the bike is running lean. I called the dealership I bought it from for them to fix it. If it runs worse, the carb is too lean. How can I increase the lean angle? Is it the stock pipes scraping on the right or the foot controls? Which would be the best bang for the buck: Taller shocks? Rear-set foot controls? Or forward I used to own a 2010 Trike that was so lean from HD the fuel mileage was horrible, 21 mpg on the freeway running 75 mph. This causes the engine to run either rich or lean. I've had it since new. AbueloBill. it all works again, after I did the above fix, it looks like auto-tune is working now too. ) The Mixture really might be lean. 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. 1974 Suzuki Front is running lean. That will help you to identify the problem. 4. If you're too lean, usually you'll find the bike pops on decel. 1974 Suzuki GT750 Lemans (Water Buffalo) Hey guys, So I made a post earlier about the fact that, since I've changed the exhaust on my carbureted 650 Bandit, I've been hearing loud crackles and the bike has holes in acceleration where it'll stutter when I open the throttle more than about 50% and resume accelerating after a few seconds; several people have suggested that the bike is probably running lean. As the gas speed increases the momentum increases which is what allows the gas to continue to flow after the valve closes, if you keep the gas moving while the valve is closed you will increase the scavenge when it opens next. In this article, we’ll cover the basics of sputtering, common causes of sputtering on Harley-Davidson bikes, and tips for troubleshooting and fixing the problem. They are usually jetted very lean from the factory to meet EPA standards. 0. If you get a free flowing air cleaner and jet the carb correctly you will really like the results. Fixing Rich Running Problems In Harley Motorcycles. Either exhaust (new mufflers or pipes) A carb'ed Harley will almost always run a different AFR between front and rear cylinders. 1. Running lean on both cylinders is another indicator for the need to check for this. 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. Running lean, or a bad sensor or it's wiring. They will fix it under warranty. They did an oil change and sent it G' day guys, perplexing problem with the rear cylinder running very rich at start and idle. Fortunately, you can easily fix it by reading the DTC codes and replacing or repairing any faulty component. If your Harley is backfiring on acceleration, it’s likely due to a lean fuel mixture. Post Apr 12, 2018 #1 2018-04-12T18:42+00:00. Here are some common signs to look out for: Signs Your Motorcycle is Running Lean. Changed the plugs the other day and tips had a defined whiteness to them . It makes the engine run hot. There are tons of dyno'd maps for your set-up. I'm sure the bike is fine. That's the cheap fix, anyway. Without a tuner, your Harley may end up running too lean, which means it’s not getting enough fuel for the amount of air it’s taking in. I If it runs better, the carb is too rich. 1995 BMW K75/3, 2005 Harley-Davidson Sportster Roadster, 2015 BMW R1200RT, 2017 Harley-Davidson Road King, 2017 Honda CB1100EX, 2020 Ural Gear Up, Understanding Lean Condition. 1. During such instances, you’ll need to have the carburetor cleaned. What would make this happen? Bike has 38,000 miles on it . 1978 Strokershovel Lowrider 100 inches I suspect that my bike is running to lean. Thanks everbody for all the ideas! Here are answers to your questions so far: Fourcats - I'm running Stage 2 with a Dyno tuned PC. Plugs are white, smells like fuel, decel pop every time I let of the throttle, and it's running stupid hot. The ECM will only post codes for a map sensor that is Open or Shorted, Not for a sensor that has non-linear output. Spark plugs may also show soot. So bike is new 2014 Slim with SE Shotgun Slipons and SE S1 breather and I'm getting quite a bit of popping on deceleration. 1,076 55. And most people here are correct that running rich is better than running lean. I want to know if this is true. A good, professional dyno tune will lean out that rich, for a more aggressive tune. My dealer knew nothing about it, and had to call Harley. The Harley Davidson CV (Constant Velocity) carburetor is a pivotal component in a motorcycle’s engine, ensuring that the correct mix of air and I have posted before about Having alot of decel popping and what I thought to be the bike running lean. 1974 Suzuki GT750 Lemans (Water Buffalo) Thanks Guys! I really appreciate your responses. Even if the rich mixture produces higher RPMs. Older carbureted twin cams, Evo's, Sportsters, Shovels, and Pans run (when tuned using an O2 sensor) run as rich as 10. Come join the Cleaned carb - Now running lean. My mech says that the electronic ignition does not need/use the VOES (however, it is connected with the carb). it runs real good as long as I have new plugs in it and after about 40 miles they get smoke up like. You want to be optimal, or just slightly rich (does keep engine temperatures a little lower). In older bikes with a carburetor, fixing the problem is easy. If you run it too long with the enricher on when it's cold, it will foul the spark plugs. Guess i will figure it out soon. 50'. Ok. If that doesn't fix the problem I guess I will 3) My last Harley I bought was a brand new shovel in 1977 and the engine was hard mounted and it seemed smoother than these new isolated computer wonderssigh The oil is synthetic and was just changed at 10,000 but I will check it out. Problem is, not every engine runs the same, so some end up lean in this range, resulting in the symptoms you describe. I'm running an H-D Keihin 40mm CV which came with a 45/195 and was running lean, so I went to a 48/195/N65C Sporster needle summed 0. 2 when cruising. Lean means it gets less fuel. I'm a DA and have EFI on my bike 2004 Dyna Lowrider Harley Heavy Breather,Stage 1,Screaming Eagle mufflers. Bulletin No. Troubleshooting sputtering issues on your Harley can be a complex process, but with the right knowledge and tools, you can get your bike running smoothly again. Performance improves with the choke on. Thanks for the help. A forum community dedicated to all Harley-Davidson model owners and enthusiasts. 4. listen to the engine builders on this blog and get one that works for you. If you hav If the bike was running great one day, and now runs lean despite changes with the DFO, then you could have a faulty DFO, or a few other issues. need fix ASAP! Discussion in 'Road Warriors' started by 775, May 2, 2015. to night i plugged my lap top into the PCV and started looking at the map and noticed while running afr1 is real fat 1. Now that you know what it means for an engine to run lean, lets delve into how you can spot the early symptoms of this problem. A few things to consider: 1. A lean running condition means the air-fuel ratio is is getting to much air for the amount of gas. The orifices in the pilot or idle jet are so small that it's likely you can't clean it without a soak in carb cleaner. If that threshold is not maintained, the bike will run lean. While Harleys run lean as it is so to make it even more lean is a concern. Harley has not issued a service bulletin as of yet but if you call customer service they will tell you about it if you ask. A motorcycle running on a rich fuel mixture is inherently bad for motorcycle performance. Page 1 of 3 1 2 3 Next > SilverRhino, Apr 4, 2012 #1. Random backfires through the carb are often a sign of an overly lean fuel A carb'ed Harley will almost always run a different AFR between front and rear cylinders. NOT! Went back & politely raised a little hell--they fixed it, said the tuner had adjustments to lean out only during decal, etc. It is a liquid cooled four-cycle engine POSSIBLY running lean, not an air cooled two-cycle running lean Identifying lean or rich conditions is the first step. What are some signs of running too rich or too lean? What will running like this for a period of time do to the machine? A forum community dedicated to Harley Davidson V-Rod Motorcycle owners and enthusiasts. I figured out I was not releasing the throttle fully when shifting. Running too lean is more dangerous than rich, but running too rich can cause problems like washing the oil off the cylinders. At first my thought was that the mapping was running lean, but after getting everything reset at the 1K service, my mileage is averaging low 30s (have no clue where this falls in the range, but I feel that it may be bit rich). 67hat34c I talked to service dept on saturday at Orlando HD and they verified dyno test showed bike running lean. Come join the discussion about modifications, troubleshooting, maintenance, performance, classifieds, and more! If the bike was running great one day, and now runs lean despite changes with the DFO, then you could have a faulty DFO, or a few other issues. By my calculations my bike has used/ burnt about a quart of oil in 800 miles Which, is not good. I have Vance & Hines exhaust, Screaming eagle Air Cleaner, stg 1 download from the dealership. 775 Adventurer. may also need front catalytic converter. What causes the P0171 code? The most common causes of the P0171 code are vacuum or intake leaks, low fuel pressure, a faulty PCV valve, or a faulty MAF sensor. All engines require a proper mixture of air and fuel for combustion; the strange device known as the carburetor controls the ratio of the fuel/air mixture entering the engine. However, by understanding the root causes and knowing how to diagnose and fix these issues, you can keep your Harley running smoothly and safely. Compression in front cylinder was 40lbs after rebuild and before valves were seated, but has now dropped to 32 lbs. The factory How Do I Fix My Running Rich or Running Lean Bike? Firstly, if your motorcycle has a diagnostic tool, check the air-fuel ratio. 7 parts air to 1 parts gas or 14. It's an 02 Wide Glide with a CV carb Check me pleaseremember. -m Can you damage your engine by running things too lean? What actually causes the damage, lack of fuel or knock?Come along to our next free lesson to learn mor - When you close the throttle after a high rpm run and the bike is decelerating under engine braking. One more thing to check: bad crimp to an injector connector, or an inside the insulation wire break. This means there isn’t enough fuel in the air-fuel mixture. A knocking sound in a Harley Davidson engine is not something to take lightly. Regular checking of fuel pressure is essential, as this will highlight inconsistencies or faults in 2004 Dyna Lowrider Harley Heavy Breather,Stage 1,Screaming Eagle mufflers. That said, fixing an engine running lean requires fixing the actual cause of the problem. A car running lean can be frustrating, particularly if the problem has progressed to the worst-case scenario. I said that I have read that in forums. Late model twin cam fuel injection are set up to run really lean - almost at 17. Learn about Harley carburetor troubleshooting when faced with issues like feeling a stumble at speed by Fix My Hog. Because of this, every once in a while one will be just too lean. there are a world of tuners out there and everyone here has an opinion on 'em. Cracks or disconnections can significantly impact performance and trigger a lean condition. Acceleration is poor or stumbling. Seek professional help from a trusted mechanic or your nearest Harley service center. , etc. Thanks Tom, I do have a replacement front 02. Joined: Apr 2, 2012 My bet is that will fix it. Engine Running Lean Symptoms. Step 8: Gently use a wooden stick to remove stuck dirt from the air filter. if it "pops" on the way down this is a symptom of lean (on the pilot or air screw) - When you close the throttle after a high rpm run and pull in the clutch yet the engine seems to "hang" at a higher rpm, rather than quickly coming back to idle this is a symptom of Contrary to 'common sense', running lean destroys gas mileage. In this article, we will discuss the causes of a lean running condition, the tools needed for fixing it, He’s half right, they do run lean from factory but not in the dangerous level. Wrapping Up. However they could not tell me why. Like almost 400 degrees sort of hot. My 2002 ultra is cutting out and running very lean. It seems to be running too lean! I've really tightened the intake manifold and checked for leaks around the carb. Decreased power and acceleration. How much does it cost to fix a Still, remember that Harley Davidson sputtering issues can be frustrating and potentially dangerous. When the engine is running lean, it’ll mean there is too much air in the carburetor and not enough fuel. The Stock Harley jetting is very lean from just off idle to about ¼-throttle. Once the engine is warm the backfiring[and what a backfire people are diving for cover] dissappears and the plugs read a lot cleaner but let the bike idle for a minute or two the rear plug fouls. with and adjustable main jet. If your engine runs lean, it will perform poorly and burn more fuel, meaning you’re overworking your engine and damaging it. 2004 has a tube in the tank that Learn how to diagnose, understand, and fix your motorcycle when it is running rich or lean. A lean mixture has too much air. It's my dad's truck, but he always asks me to do his mechanic work for him. The latter presumably was a Harley SE one, all the additions to the bike appear to be Harley parts. The His rear cylinder is running lean and his front is running rich. SilverRhino Adventurer. Adjusting the fuel-injection system can often correct the imbalance by ensuring the correct amount of fuel enters the combustion chamber. It Dynos 150hp to the rear wheel, not bad for about a 700lb bike. So just after 1 day of ownership of the bike, she started to 04 Softail Standard , no modifications ,stock intake and exhaust . In this guide, I’ll review the diagnostic process to help you fix I believe HD has these things set up from the factory to run leanest at partial throttle in this (2500 - 4000 rpm) range to improve fuel mileage and emissions control. You may notice a hesitation when accelerating. AFR request is 14. They absolutely look like it's running rich. EFI running lean. but I'm still running lean. ↳ The Harley-Davidson Combination Straightening and Aligning Table (Service Dept. It's done thousands of miles after the fix, and it's all been due to a corroded o-ring in the multi-sensor. When this occurs, it can lead to various issues. The correct mount is part# 50096-09 this is the part number that is in the parts book. Grab some second-hand XiEDs - they tweak the signal from the o2 sensors and fool the bike into running richer. The engine has been running extremely lean and hot Stock recently rebuilt Harley 45 flathead. I don't know much about your particular bike, but I can say for sure that a white spark plug tip indicates lean running and is something you need to fix, because it can be dangerous for the engine. Absolutely no intake leaks. if it's running, it's lean! only way to adjust is with a tuner. There needs to be the correct amount of air and fuel added to the engine for the vehicle to work properly and motorcycles are no exception to this rule. The engine is a 96ci and the bike has low mileage, under 1,000 a year, and is otherwise stock. Go. It was running lean at off idle to 3/4. They said under normal riding conditions the engine wont make it past 5K miles. 1978 Strokershovel Lowrider 100 inches. If the bike is fuel injected, the dealer will have to change that as it's not owner servicable. "Recommend RAR Catalytic Converter due to leaking exhaust and all 4 o2 sensors due to running lean. Both cylinders were running fine but front recently started running lean. when you open up exhaust you need more air to maintain proper mixture. Yamaha has been building great motors as of late. I put a whole bottle of seafoam in the its 1981 harley sportser 1000cc, drag pipes, and new s and s air cleaning, and 40 mm bendix carb. Also, so "dielectric grease" on the connectors always helps prevent corrosion. Remember, regular maintenance and preemptive care are your best defenses against these problems. and its go around 15 grand miles. One way to spot a lean running engine is a decrease in The carburetor is probably the most misunderstood mechanical part on a motorcycle and many small engine machines. Sportster Models . 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 Lean AFR Low dollar fix ? They basically fool the ECU into thinking the engine is running leaner by adding a resistor inline with the O2 sensor wiring, which reduces the Ohm readings to the ECU and the ECU feeds the injectors more fuel. got Looking at an Iron 883 or Nightster, but would like to be able to ride a bit more aggressively and lean further than the stated 29* right, 30* left. bleh. Your Harley Is Randomly Backfiring Through The Carb. They quickly said I needed to hurry up cause the engine comes from factory running real lean. This tool can provide more insight into other potential issues affecting your vehicle’s performance. Fuel acts as sort of a coolant, with more air and the same amount of fuel, you will be increasing engine temp which can cause big problems if you push it. 1996 FXDS-CONV S&S E. Any It's runnplugsing like dogshit. 6. So, yes, they did fix it and their "fix" lasted maybe 2 days then back to excessive decal popping. To fix the P0171 code, you need to check and repair vacuum leaks, repair low fuel pressure, or replace any faulty sensor that can cause a lean mixture on bank 1. Running lean questions. Made it a whole new very quick machine. The spark plugs looks like lean running plugs; One of the exhaust pipe has started to become yellow\blue; When engine warm and I open (edit: closed) choke while riding If you're too rich you will see black smoke coming from the exhaust pipe. com. All this follows after a 95 big bore, 203 cam and a stage 2 download on my 2004 RK[efi] 2004 Dyna Lowrider Harley Heavy Breather,Stage 1,Screaming Eagle mufflers. new intake and exhaust gaskets installed, stock EVO with Keihin 190, 48 with 1. It’s now running a S&S 124 with headwork and a 6 spd trans. I'm thinking that I was running rich in the beginning, and from the main issue the sensors for covered in carbon and now can't read anything which could be why I'm running lean. This will result in popping sounds being produced in the intake. 0 (new). Mechanic's Assistant: Are you fixing your bike yourself? What have you tried so far? Yes I changed the fuel filter and hose's if it's running, it's lean! only way to adjust is with a tuner. 08vrscdxa w/ v&h comp indy, pcv w/ autotune. 5:1 rear , 13. I dunno. This can be caused by a number of issues, including a clogged air filter, incorrect carburetor settings, or a faulty fuel pump. The wires to the O2 sensor is kind of delicate, and can easily break if you're not careful, such as removing/reinstalling sensor, etc. A rich mixture has excess fuel. Woe unto you that -P We've gone from using big hammers and greasy wrenches to needing computers and Ouija boards in order to fix our rigs. You really should bump that pilot jet up a number or two to really fix that lean problem. Regular maintenance and using the right oil and fuel can also go a long way in preventing engine knocking. However I could be wrong. the plugs will tell what it's doing, but won't do squat to fix it. will be able to inspect once exhaust is remove and can be able to visibly see inside. Diagnosing a Lean Running Motorcycle. While cold, the insulation could be stiff enough to keep the connection lined up. If the the O2 sensor is too cool ( from a too rich mixture) the NBs won't Don’t overlook vacuum hoses either. Rich means it gets more fuel. 1 of 2 Go to page. Joined: These bikes are set up at the factory to run a very lean mixture. However, that's not the full story here, and I doubt it's actually running rich. Bike was running lean after installing the Supertrapp 2-in-1. We did also convert it to fuel injection a couple years later after running a Super G for a a while. Now I am a little worried. If it hasn't been tuned to run that rich, and the only mod has been pipes, than the carbon fouling is likely not an indication of Hey y'all I'm new to this forum and just got my first Harley! 2019 StreetBob with 10,000 miles I just had a few questions about my brand new used bike and I'm hoping y'all could help me out with it. A motorcycle that is running lean will exhibit several symptoms indicative of the condition. The second could be possible. Running rich means that too much fuel is going inside the cylinders, which can lead to serious engine damage and carbon buildup. It causes a rough idle and black smoke. I wouldn't have any concerns about the exhaust having damaged something. eg 14. I have NO intake manifold or head gasket leaks, I have repeatedly tested with pressure. A lean mixture forces the engine to work harder, generating excess heat. This can lead to engine damage over time, which is a costly and inconvenient fix. Credit: catalog. Stock recently rebuilt Harley 45 flathead. Step 9: Shake off any excess water from the air filter and let it air dry completely. Got a friend bringing a triler to take it home and check it out. 8 thru 13. 3. Page 1 of 2 1 2 Next > 775, May 2, 2015 #1. Running too Lean?? Thread starter 67hat34c; Start date Mar 8, 2010; 1; 2; Next. That said, my bike runs fine with rapid Harley problem. 5:1 front Exhaust reversion with short pipes can make it worse . Famos791 - The independent sprayed starter fluid to check for a leak and decided that wasn't the problem. If all else fails, using an OBD-II scanner is helpful for deeper diagnostics. I will check for intake leaks and fix. 87) ↳ Winter windshield kit; ↳ WLA uncrating assembly instructions; ↳ 1935 Rider's Hand Book; ↳ 1929 Rider's Hand Book; What you need to look at is gas speed, the faster you can keep the gas moving the lower your pressure will be at the port. Discussion in 'Thumpers' started by SilverRhino, Apr 4, 2012. This range is where most riding is done. Removing the air filter increases the air flow into the engine, so if the motor is lean, it already has too much air for the fuel cylinder and it’s going to run worse. 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 stuck open butterfly valves; Change your O2 sensors if your motorcycle has them; Front header pipe RED HOT stationary run > 7 inches Noticably hotter than rear 74 ci 2004 Dyna Lowrider Harley Heavy Breather,Stage 1,Screaming Eagle mufflers. Check out the EFI section. After everything was installed the decel popping started. nl . Identifying a rich running condition in Harley motorcycles is pivotal for optimal performance. Lean symptoms: Engine overheats, poor acceleration, popping sounds. 6, and Spark Advance tables are retarded by 4° during Autotune basic, but the actual AFR coming out the exhaust is determined by what is happening inside the combustion chamber, which is influenced by the VE tables, engine temp, injector pulse width, injector flow, etc. All this follows after a 95 big bore, 203 cam and a stage 2 download on my 2004 RK[efi] I don't think it's running massively lean but because it's an air cooled 125 it's often running at high revs so if it's even a bit too lean it will get hot. Screaming Eagle ignition,V&H Short shots. EFI Sporties run lean from the factory. I grabbed a set about a year ago and my Iron's ran much smoother since then. How Do I Fix My Running Rich or Running Lean Bike? it's air fuel mixture pure and simple. Engine running hot. Engine doesn’t respond when the throttle is snapped open. A lean running engine receives excessive air relative to fuel. It's an HD certified bike and I've done nothing to it since I got it. You can run it for awhile without a tune but if you push it too far you can cause damage. - Hey everyone, I'm new to the site, but my family has owned a 2003 Harley Davidson edition since it was new. I know the pilot jet is for slow speed (less than 3/4 throttle) and the main takes over from 3/4 and up. 2. I'm the proud owner of a 2004 GTO, and heard about this site from LS1GTO. Told them about it again and they said they fixed it. I think many may disagree with him since most postings/dealers say to increase the slow jet with pipes and air filter upgrade. 2 (new) an up to firmware versions: 0. You can see over a 1 point difference . Most bikes are slightly lean to reduce emissions (but running very lean can damage the engine). Cost of SOURCE: random/multiple cylinder misfire detected Bank 1 Hi it sounds like the EGR valve is either dirty or has failed, do you lose any power at all, if not then thats a good sign, remove the EGR and clean with carb clneaer only, leave to dry naturally and dont try to dry it or touch it yourself, they often do get dirty as the job they do is similar to that of a turbo with So is there a fix for this or do you just learn to live with it? According to "Doc Harley" there is a 10% variance allowed in the base fuel injection map to allow for either the Screamin Eagle exhaust or air filter . One of the potential problems is damage to your catalytic converter. You won't notice any problems with a too small main jet when riding around normally, only at full throttle in the last 1/4 of the rev range. Intake leak most likely Step 7: Thoroughly clean both sides of the air filter with cold water. 3. Slipped it a cam and tune which perked up the power and helped the mileage up to 28 - 30 on the freeway running 75 mph, not half bad for a 1,200 lb aerodynamic brick. (make sure you ask) The first makes no sense, as that's what you do when you accelerate unto the highway. Understanding the causes is crucial for resolving Maintenance Shop - 2003 Harley, lean codes+no start. Popping or backfiring sound from the exhaust. It is running lean. zodiac. Much better running. Symptoms of Running Lean. Introduction To Harley Davidson Cv Carburetor. If you’re not sure whether your powersports vehicle engine is running rich or lean, find an open, clean space where debris won’t get in the motor, then remove the air filter and run the engine. The older second job powdercoat / FORUM HARLEY MEMBERS G' day guys, perplexing problem with the rear cylinder running very rich at start and idle. 1 AFR and hot. Identifying the signs of a lean running motorcycle is the first step in diagnosing the problem. I will drop the money right now to fix the problem. 7:1. Rough idling, hesitation, and poor acceleration are all signs of a lean running engine. Let’s get something straight; engine running lean is a problem and a symptom of another problem. 1 under WOT and generally around 12. He said that would fix the lean engine, I don't trust them. These symptoms can lead to higher engine temperatures and potential engine damage. Step If the bike was running great one day, and now runs lean despite changes with the DFO, then you could have a faulty DFO, or a few other issues. The only thing is you can only do 1 of 2 mods WITHOUT a pcm flash/tune. And put torque inserts in the exhaust to fix the You have all the classic signs of a bad MAP sensor. Related: Harley Oil Sumping Fix: A Comprehensive Repair Guide. My problem is I do not know how to richen it up with the fuel Pak. Among the common signs are an erratic idle, backfiring on deceleration, and a noticeable lack of power. If the Understanding why your motorcycle is running lean and knowing how to fix it is crucial for maintaining optimal performance. This is causing me some sleepless nights. Mechanic's Assistant: What is the make/model of your '02 bike? Harley ultra classic. I think timing is also a Harley Davidson Motorcycles. I've also notice the sutty stuff around the carb. Next Last. The main cause of a motorcycle backfire is a malfunction in the emission system of the engine, which results in leakage in the exhaust. While i was waiting i plugged up to the PCV (w/autotune) and started it and the front cylinder was running in the 33. The perfect ratio of gas to air that a motorcycle should be receiving is 14. czpkvbjvldazdtffktwlfuregbmeafntcpvqhmmvttlcnkjufdeprarseqpbeztbjpogvcuacrunyggphht