Motorcycle Sputters At Full Throttle

What causes a motorcycle to sputter while riding? What causes a car to jerk while driving can be based on many factors. gaining 260 bps to 18. The bike idles way better, doesn't die with he choke too, but under load it still bogs down around 5-7k from, bogs down alot on full or half throttle too – Iqbal Khan May 29 '16 at 21:47 From what I've read people at its a jet issue or something being dirty or clogged it seeing that I've cleaned it so much I doubt this. and it sputters at full throttle. when i have it in park i can rev the motor up and it doesn't sputter. When I drive in 6th gear constantly and then accelerate hard it sputters like fuel or ignition spark is missing. I haven't tried full throttle or anything yet as the bike is unrideable in this state. If I shut it off for 20 minutes, the scoot will fire up, run great, but at full throttle it will die again after just 2-3 house lengths. The coil itself was fine. A few times the bike actually died on me from this and then wouldnt start up again b/c the battery got drained. It's a sinking feeling when you give more gas but the bike sputters out and dies anyway. I'm 100% sure Charging system-good. The injectors are brand new i put 2 new ones in a couple of months back, ill check the throttle body for a leak, already checked for a vacuum leak i couldnt find one, i got a new coil, dist cap n plugs n plug wires r all good. There really isn't enough information to answer this question. The engine will catch or sputter. Well after chasing the ECUs and tunes half my bikes ownership. Linkage is good and it will rev up at idle. Boat runs great until after about 1 hr when it starts to sputter and spit. Needle Jet. See my reply to the other comment for a more detailed explanation. The idle switch is connected to the ECU, and the full throttle switch to the A/T computer. She didn't do the sputtering thing again. Use the little red hide to get close to the intake flanges. 2010 2012 Sale. Low rpm operation is controlled by the intermediate jet (#11). The Throttle Valve. Carburetor Synchronizing: When Should I? – If you happen to purchase (links below) or own a carburetor sync set, then you are more than welcome to perform this task as much as your heart desires. Hoping someone can pinpoint this issue for me. Its not good to rev up like that, if theres a fuel clog you're turning a cyl at 5K with no lubrication. Basically, shell start up fine and idle around 1500-2000 rpm (full choke) but upon going to 1/2 choke or giving her any throttle, she dies. If it idles fine but it bogs down with throttle, your high speed gas jet is probably clogged. Give it more fuel and it loses more power before it starts surging and sputtering then it eventually just dies. As I roll on the throttle the engine boggs down and sputters as I ride and looses power. Plus is just doesn’t seem to have the full power it did prior to that almost empty tank. The bike pulled strong to 3/4 throttle and then at full throttle it started to sputter and cut out. You said it runs good at full throttle? Put in new plugs and do a plug chop at full throttle to see what color they are. through 2-4 cylinder motorcycle engines to car engines and performance engines (Forced induction. 2010 2012 Sale. Starts fine, runs great up to about 20 mph, then sputters. Hey folks I need some help. So I changed the main jet to170 and moved the needle to the fourth slot from the top. I have a 1975 z1 that I just rebuild recently, I had 1974 carbs on the bike about 2 weeks ago and the bike ran perfect But then I put on the correct 1975. We turned back. This happened a few times sporadically, only from about 4-6000rpms, and only pronounced from first to third gears (maybe felt it in 4th ) where the engine sputters with light, slowly increasing application of throttle. It runs fine during accel and decel, but when cruising/steady throttle or very slight decel it sputters. I drained the float. sorry to bring back a dead topic but I am having a similar issue. I have only only put 100 miles on the bike and the milage seems to be terrible. I recenlt switched to non ethonl gas. I ride a 2002 Honda Shadow VLX 600, and when accelerating in first gear or going up hills, the engine will completely cut out, like it has died, but if I let off the throttle it will continue to run. Otherwise, enter your full name as your username and. Is it a manifold leak? She ran fine not too long ago. I assume this is running rich. TPS is Throttle Position Sensor. We are going to mimmick open throttle by jumping the relay behing the glove compartmnet and then put a fuel gauge on the shrader valve for the fuel rail. Take a seat behind the dash of my newly purchased 1983 Honda Nighthawk CB450SC as I go for a short test ride. The new service manager knew about tech tip 442 and said that even though the tank was full, the gas was sloshing around in the tank and the fuel pickup was not functioning properly. If the bike sputters or sounds rough when giving it throttle, raise the clip (lowering the needle) until it runs cleanly. At half throttle the engine will red line, but when I give it full throttle the engine sputters down to 5k. With the CV, when you twist the throttle, all you do is open a butterfly valve and the resulting vacuum then causes a rubber bellows to lift which lifts the throttle slide, thus giving more air. An engine running out of gas will definitely sputter but if the gas gauge indicates full, the problem lies deeper inside the engine compartment. It will sputter for a split second, then it will "catch" and start moving for a split second, then repeats the process until I let off the throttle. a valve which allows more or less fuel to go into an engine and so changes the power with which…. if this problem repeats the next step I will take is the egr from a used car, if that holds for 3 - 6 months we will purchase a new one. View Qwahzi's profile. I also noticed, while running it in the garage, that at high RPMs the flexible section of the exhaust glows red. Yoda, please help!!!!. When you crack the throttle, the system switches to open loop mode and its the transition that causes the stall. I can take off down the road and go 30 or 40 mph at full throttle and it runs fine for about 15 to 20 mins. it has 28k on it and has never run poorly except after sitting for a while, and i know it is the gas gumming up the carb. I thought it may be an issue with old gas or possibly with gummy fuel injectors but I had undergone full seafoam treatment twice with two tanks of new premium gas. I'm still in the break in period so it's hard to open it up but there is no full throttle Sputtering and sluggish - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums Google search. Full throttle sputtering / misfiring 07-15-2010 09:01 AM #1 Fabbed up a 2. com - Full throttle Hesitation apr stage 1 Username or Email Address. I have a 2015 R6 that I just bought 1500 miles and first thing I did was a full m4 exhaust and power commander. My wife's 2005 FLHTCUSE2 began to develop problems a few weeks ago. I don't think it is timing, since I just put on the cam and made. After about 15 mins she showed up and said her bike would not stay running. Never have had an issue with it. Also, when opening throttle all the way, the power seems to disappear. It doesn't want to clean out. The new service manager knew about tech tip 442 and said that even though the tank was full, the gas was sloshing around in the tank and the fuel pickup was not functioning properly. For example, using too large of a main jet will cause more fuel to enter the combustion chamber than it can efficiently burn. Harley sputters at cruising speeds, but idles fine and goes great full throttle My bike has fuelie pipes on it with cones, and an s and s shorty carb and the motor is the twin cam 88. I bought a new EGR valve at NAPA & replaced it. Total Motorcycle Forums it now only runs good at an idle or very low throttle. Yes the gas was a little old but not like a year old. Clean your carb and spray carb cleaner in all small passages, make sure air can flow through all ports no matter how small. I guess you would call it a sputter. The throttle Valve is the big slide that opens and closes your throttle has a bevel angle cut in one side of the big round (can be flat, too) slide, toward the air cleaner. I have a 2006 yz250f that has sat since 2009. Bike sputtering Anthony Brown. ive been down a little on power at 10-000 feet andabove on hot days. Ok so my bike has this bog that is pretty annoying. The previous time they adjusted my throttle and temporarily fixed the problem. I replaced the battery, and so far the bike hasnt died completely on me yet. Take the old battery completely out of the system. Yamaha Star V-Max VMAX Motorcycle Discussion Forum my air / fuel screws are out 3 full turns now. Hey, I just bought a 1999 WR 125 and it ran ok for a while but after about ten minutes it started to bog at full throttle. We found the last sputtering problem after letting the bike sit for a few days and clearing our heads out. When the main jet is Rich the engine will be a bit flat or lazy at ¾ to full throttle, giving off a flat, dead sounding exhaust note. I have to litterally time it perfectly or else it cuts off, and even Engine sputter on throttle - Ex-500. I put slip on D&D mufflers on just so shes safer. idles perfect, carb just cleaned and has a good battery ??? - Answered by a verified Motorcycle Mechanic. 4) Main Jet – This circuit affects the mixture from 1/2 throttle to full throttle. The problem is that I can't get it to run without sputtering now. Needle Jet. First off it is a 85 250r, with FMF pipe and silencer, k&n filter and no airbox lid. Hello, i own a KZ550 with GPZ engine. Not sure how or why, but it has, all by itself, returned to its original condition of starting, idling fine, running well for a few minutes, then suddenly starting to sputter when stepping on the throttle. A lean pilot jet setting will cause your engine to surge at very low RPM’s, bog or cut-out when the throttle is opened quickly and have trouble idling down. Let it run for about 20 minutes to pull some good gas through and sprayed seafoam. Made me think of carbon'ed up plugs and I dismissed it at that. I have to keep the speed down in or. Things were looking up: I replaced the spark plug, cleaned out the exhaust, adjusted the idle / fuel screws, and even replaced the brakes (I can stop now!). SCOOTER FULL THROTTLE HELP!? My scooter was working fine, but it's just now started giving me problems going full throttle. I ride a Honda Rebel 250 motorcycle and over the past few days I find that the bike is losing power when accelerating fast. Symptoms: Engine Hesitation; Lacks Power (Figure 6) Throttle Position Sensor (TPS) full range test (Figure 7). Never have had an issue with it. Vulcan 750 throttle bogging HELP Jacob Manuel. Starts up fine, plugs good. but after i whooped a couple cbr600's i raced a 05 636 and after the clutch was out on the launch my bike was sluggish untill i got passed 10-11k. Max - Answered by a verified Motorcycle Mechanic. After doing some riding, it's pretty clear that the bike surges and sputters when I maintain a constant throttle. Backfiring during acceleration occurs when ignition takes place in the intake or exhaust instead of the combustion chamber. I guess I was wondering were to start looking for this. usually it is a cheap conector that fails look for the scotch lock wire crimp on the throttle position sensor or any other conection bet that is the problem. The carbs were re-tuned. 4) No power or heat source to choke. Hi all, There was a thread that I posted to recently and there was a great response by a member, but now it seems to be gone? Anyhow, after letting the CB750 warm up for several minutes, if you twist the throttle at medium velocity, or hell, even "gently" the bike will sputter and die. I just bought a 1982 Suzuki GS750T. The bike idles fine, but at constant throttle it sputters and seems to pop almost like a miss. The jet needle rests at the bottom of your CV piston valve. Lets say i am in third gear cruising in traffic, i have to give it a good amount of throttle for it to run smooth. After I let it warm up, I gave it some throttle and it dies on me. I haven't tried full throttle or anything yet as the bike is unrideable in this state. It has some lag when giving it throttle and seems to sputter if you try to get on it when cruising. Harley sputters at cruising speeds, but idles fine and goes great full throttle My bike has fuelie pipes on it with cones, and an s and s shorty carb and the motor is the twin cam 88. Engine sputter or misfires (1/2 - 3/4 throttle) This area is controlled by the needle jet and jet needle. This will result in a "sputter" at full throttle. On my first ride, she didn't sputter. 9 on the calibration runs [full throttle in 4th gear on open highway] throughout the entire rpm range. Idle Circuit - for idle and off idle. Recently, I cleaned it up and drained the old gas out of it. Culprit? the web is full. It does happen at low rpm, high rpm, mid rpm, small throttle opening full throttle opening. I also got my carbtune and color tune today after I had it out. Here we go again. Hi, I have a motorhispania ryz 50 2011. Full throttle sputtering / misfiring 07-15-2010 09:01 AM #1 Fabbed up a 2. an example of this would be if I were to be going 50MPH in 5th gear, the bike sputters slightly (you feel a pulse in the power), if I accelerate to 55, the bike stops sputtering. Its so bad that it wont rev up at all, just sputter sputter sputter. It also calculates the amount of air flow to the engine and the amount of fuel to be injected for the required ratio of air-fuel mixture. The bike runs fine so far. Loading Unsubscribe from Jacob Manuel? Buying a $700 Craigslist motorcycle - Duration: 23:29. I put 93 gas in the. Engine runs smooth, and doesn't smoke, just will not turn up to rpm. When I pulled it back out it was sputtering badly and would die on me unless I had it full throttle. Last is the main jet. only starts when I'm at high speeds the sputtering start. We found the last sputtering problem after letting the bike sit for a few days and clearing our heads out. Don't touch the throttle. can into a full tank? to the Suzuki GSX-R motorcycle. The bike idles fine, but at constant throttle it sputters and seems to pop almost like a miss. If you crank it hard closed, the valve goes to far, and I think causes a "over" lean condition to get programmed in. engine sputter at low throttle, engine sputters at low rpm, engine sputters at low speed, engine sputters at low speeds, hayabusa sputtering, honda cbr600 spluttering in low revs, hyabusa sputtering at low rpm dangerous, m109r sputters at low speed, m109r sputters in gear, motorcycle sputtering at low rpm, motorcycle sputters at low speed. i found that when i more then half. A lean setting will cause your engine to surge at very low RPM’s, bog or cut-out when the throttle is opened quickly and have trouble idling down. The little bar to the left of C00 shows throttle position. Also, it accelerates, but not like it should - it seems to take a little bit for it to really kick-in and it feels like during the first 2-3 seconds of doing so, the engine is like loose, missing or something. I will give it full throttle but the bike will keep dropping speed or just hold the speed at ~65mph. kept doing this every time i started it until now it just wont start. Guess I will bite the bullet and take it to the shop. Loading Unsubscribe from Anthony Brown? How to Use Seafoam on a Motorcycle with Carbs - Honda Nighthawk 450 - Duration: 3:59. Make sure the battery cables are nice and tight first use a socket or a wrench. I googled and found how to check the codes and got several (thought I'm not sure when they were thrown):. cbr1100xx carb throttle response, honda b18b1 poor throtal responce, motorbike throttle slow, motorcycle bad throttle response and vibration at low rpm, motorcycle slow throttle response, motorcycle throttle not responding, motorcycle throttle response problems, my 2012 yamaha grizzly 350 has poor throttle response, no throttle response motorcycle,. It has some lag when giving it throttle and seems to sputter if you try to get on it when cruising. com is the online powersports supercenter for seasoned wrench turners and novice riders alike. I have a 2015 R6 that I just bought 1500 miles and first thing I did was a full m4 exhaust and power commander. Dirtbike BOGS when I open the throttle fast - Problem solved - FIXED Vegas RoManiac Dirtbike BOGS when I open the throttle fast - Problem solved - FIXED 🤩 My favorite motorcycle tie. It sputters slightly full throttle but not in neutral ive changed the spark plig and re-tuned the carb but it didn't completely fix the problem. I always forget if this is rich or lean pilot setting. The popping is a result of the air/fuel mixture becoming very lean when the throttle is closed and the engine is rotating well above idle speed. kept in top gear and then tried full throttle at low speeds/rpm, but I didnt really go anywhere. Typically, you want to warm the bike up and then hold the throttle open at 1200 rpm. an example of this would be if I were to be going 50MPH in 5th gear, the bike sputters slightly (you feel a pulse in the power), if I accelerate to 55, the bike stops sputtering. I will give it full throttle but the bike will keep dropping speed or just hold the speed at ~65mph. Thanks for the advice. So tell me if you've heard this story before. com - Full throttle Hesitation apr stage 1 Username or Email Address. " If I open the throttle full the engine sputters. Instead, the bike idles extremely well with no choke needed even when freezing cold, the bike will sometimes stall when quickly flicking the throttle to about 3/8 then back to 0. They have a dyno so that's no problem. When the main jet is severely rich the engine will sputter in the high RPMs and have a lot of trouble making power up top. In general if the ratio is too rich then the engine runs irregularly and if too lean then it runs really smooth but under-powered and too hot. i have a 1991 yamaha moto 4 yfm 80 and it starts fine and runs good but when i give it full throttle it starts to backfire a lot and slows down. Nearly all if not all bikes these days use CV (constant velocity) carbs as opposed to the old throttle slide carbs. It will idle fine, but at full throttle it is only running about 30% of the rpm it should (guessing). The larger screw that you could turn with your fingers is the idle screw. Motorcycle carbs have a few circuits that effect different throttle positions. Thanks for the advice. I equate the last 1/4 turn to mean "main jet. The colortune showed the mix screws were in about 3-4 turns to much, but as I understand it that wouldn't effect full throttle at 7000 rpm's. So I put a new plug in and it ran ok for about ten minutes and then the same thing happens. Backfiring during acceleration occurs when ignition takes place in the intake or exhaust instead of the combustion chamber. I have switched out the TCI from my parts bike. 2003Shadow750 · Registered. I twist just enough (closed) to get a very slight "stick". View Qwahzi's profile. I can roll on my throttle and climb the RPMs up to 8K and beyond in any gear with the engine under load so long as I never get on the last quarter turn of the throttle. Max - Answered by a verified Motorcycle Mechanic. I have only only put 100 miles on the bike and the milage seems to be terrible. It will idle normally but when I rev it it bogs. Ducati Monster Forums: Ducati Monster Motorcycle Forum > Ducati Monster Model Specific Forums > Ducati Monster S Models > S4RT Constant Throttle Spit and Sputter. It has good acceleration up to the 3/4 throttle. The sputter is not near enough to die, but its pretty annoying. That's all I did, changed the pipes. Is it a manifold leak? She ran fine not too long ago. Things were looking up: I replaced the spark plug, cleaned out the exhaust, adjusted the idle / fuel screws, and even replaced the brakes (I can stop now!). The Sportster and Buell Motorcycle Forum - The XLFORUM® > SPORTSTER MOTORCYCLE FORUM > Sportster Motorcycle Intake and Exhaust > Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust: Rigid_EVO 883 spits/sputters at full throttle low rpm. if you slowly build acceleration, she is okay until the upper rpms, then same thing. If you can start and idle fine, but slowly rolling on the throttle bogs/dies, that's the culprit. I have an 01 with about 22,000 trouble free miles and then all of a sudden it started sputtering and shutting off at speed. Asked in Motorcycles, Motorcycle and ATV Maintenance it causes a sputtering and loss of. I am very mechanically inclined and have always had a good track record fixing things until this came along. I assume the bike is properly jetted since I had a shop do a full tune up shortly after purchasing it. I was experiencing lots of sputtering and back fires when letting off the throttle and misses when running at a steady RPM while holding the throttle steady. I know it is getting close when instead of stalling or fading out it starts to run rough and sputter as I hit WOT. When at normal idle, the system is in closed loop mode. Starts fine, runs great up to about 20 mph, then sputters. I bought a new EGR valve at NAPA & replaced it. Sputtering: This isn't exactly a technical term but is commonly used to describe how an engine runs when jetted too rich. I have a 96 XR 400R with a FMF pipe. The sputter is not near enough to die, but its pretty annoying. I ride a Honda Rebel 250 motorcycle and over the past few days I find that the bike is losing power when accelerating fast. Track day over. If it sat for a minute or 2, i can rev it up in neutral, until i put it in gear and get halfway up my short driveway. They have a dyno so that's no problem. My bike has had this symptom for a while. if not the issue we will purchase a fuel. In 5th gear (or any gear, but I shift before it happens in other gears), at about 85 mph, the bike starts sputtering, hesitating or something like that when wide open and stops accelerating. Hi, everyone I am having a problem on initial startup that hopefully some of you can help me isolate. I have complete cleaned the carb, soaking it blowing carb cleaner and air in every nuck and cranny. yz 450 sputter at low throttle The guy i bought it from put an after market slip on on the bike and said he had it jetted. Since I'm the 2nd owner and since I bought the bike, I notice my RC jerk or sputtering a lot especially if I'm on a lower RPM, even with the correct gears. Turns out I had a bad main ground from the chassis to the transmission. If I try to go full throttle it goes down to almost nothing at all and sputters? Is it something to do with the fuel or the air filter? Please help!. 125-200cc WR 125 bogs/sputters at full throttle. If I hold 3/4 to full throttle, it sputters at first, then after a few seconds it will just "catch" and the rmps will go up. Twist the throttle and the bike takes off like a rocket. My dog bone was pretty weak (stock) and the engine was turning/rocking enough on the pend. The bike also needs to be at fully warmed up to its normal operating temperature. PW50 sputters at full throttle : Danny said 2006-08-16 20:02 : OK, I re-jetted till I was blue in the face, decarbonized the exhaust and exhaust port, checked the reeds, used 5 different plugs, cleaned the carb several times, clewaned the air filter, changed the spark plug cap, checked resistance on all the electrics, per the manual, and I\´m still at square one. While this Motorcycle Troubleshooting Guide is not a complete guide of every possible cause for each problem listed, it will help assist mechanics in troubleshooting some of the most common difficulties they will face. He looked over Bentley manual and said once the car is at open throttle the O2 sensors dod not come into play. The bike spits and sputters with any throttle while in gear, usually starts and idles fine. 2 weeks ago, it wouldn't idle. I also noticed, while running it in the garage, that at high RPMs the flexible section of the exhaust glows red. In the last 15 of those years, the only time I've gone down was standing at my mailbox on my motorcycle. The coil itself was fine. After several times of on/off running where it either completely stalled out (restart it with the starter button) or having it sputter and burp back to life (after pulsing the throttle a bit) - I dropped it off at the dealer. I have complete cleaned the carb, soaking it blowing carb cleaner and air in every nuck and cranny. Funny how quickly our actions can become habitual. A correctly jetted bike should rev cleanly and crisply. I added two more pods for better ground lighting and now the bike won't idle, i have to keep slight pressure on the throttle to keep it from dying out. The pulley, or as we call it, cam pulls the throttle cable as the rider rotates the grip/tube. Showing 1-26 of 26 messages. If it still spits and sputters at half to full throttle, then you will need to get a smaller main jet - or go to a less restrictive air filter, such as one by K&N. 1971 CB175 Sputtering & Bucking at full throttle That being said, the compression is even on both cylinders, the bike starts/idles fine and pulls well up to about half throttle or so. Don't take the chance. Almost always sputters at 2600 rpm. If a bit grouchy about it Useful bits: Plugs/air filter-Clean. " If I open the throttle full the engine sputters. i could go around all day in 1st gear full throttle and i wont have to change. You may need to make a few timing adjustments or replace a spark plug, or you may need serious mechanical inquiry. It was acting like it wanted more fuel and wasn't getting it. Ride motorcycle in various rpm ranges, and then try to maintain a consistent 40- to 50-mph. Be sure to purchase two new O rings for the new throttle body adapter and a new gasket for the throttle body itself. Sit there, hands in lap. I have an 01 that sputters at full throttle. My 05 kaw prairie 360 atv sputters at mid to high rpm. My 03 LT sometimes will hesitate or sputter a little if accelerating after slow speed driving. my issue is upon acceleration when I go from 1/8 to 1/4 and 1/2 throttle she sputters if I just open throttle all the way, after a second or so more, she just accelerates fine, screams beautifully if I crank through the remaining gears, accelerate fast, at 3/4 to full throttle all is well A more gradual acceleration is when she sputters. Finally after cranking it over a couple hundred times, with the battery almost run down, it fired back up and I headed straight home. I was riding my 2000 Bandit 600 to school this morning and it started sputtering. I googled and found how to check the codes and got several (thought I'm not sure when they were thrown):. RD350 Spitting and sputtering « Reply #6 on: May 25, 2010, 06:24:33 AM » put my 350 back in on saturday,it was running like crap,would not start unless i gave it full throtle,my carb slides were in the wrong way so i changed them around,i mean the wrong carbs swoped them and now running perfect, so try swaping the slides around thanks dave. Right now, it refuses to Idle with the choke off, and it sputters when you have very little throttle. The culprit was a crimped wire on the front coil. Perform full throttle "drag strip" runs through the gears reaching the top gear and pulling for a few seconds in that gear (don't go to top speed at this point just in case you are too lean). Use the little red hide to get close to the intake flanges. I have to litterally time it perfectly or else it cuts off, and even Engine sputter on throttle - Ex-500. The XL350 has an enrichment circuit that includes a fast idle that provides just enough throttle. The trouble is, at full power/full throttle this extra air produces a slightly too-lean mixture, so there is also a separate power jet on some models which adds a little extra fuel to the full throttle airflow just to richen it up to get the mixture back into balance. Re: Kia Rio Sputters for Several Seconds Every Time I Fill w/ Petrol 12/03/2017 6:25 AM Sounds like muck in the tank, when you fill up you churn up the muck and some of it reaches the fuel filter which starves the engine, I would have the tank cleaned out which may mean taking the tank off, not cheap, replacing the filter & cleaning the fuel pumps. It is just the 1/4 to 3/4 throttle positions that it is lacking. I was riding the other day and I noticed when I rolled on the throttle, the old girl was sputtering up to about 2300 or so. Hey guys, first time here and first question here 1998 ZX6-R My bike sputters like it's not getting fuel or like there is water in the lines. Also did the tb clean again to be shure it wasn't clogged. Idles very good but when I give it some throttle the bike sputters and won’t accelerate. I haven't tried full throttle or anything yet as the bike is unrideable in this state. Sputtering Sporster I had that in mind, but hesitated to take it in since the problem comes and goes. Chainsaw Sputtering. I just got this used 2006 Polaris 450 sportsman it has 365 miles and 60 hours in this machine. when i have it in park i can rev the motor up and it doesn't sputter. The coil itself was fine. The odds of this happening are very low with a small motorcycle battery. It has good acceleration up to the 3/4 throttle. Had it on the water for the first time today. it has 28k on it and has never run poorly except after sitting for a while, and i know it is the gas gumming up the carb. Check to make sure your needle and clip are in the right position and are not damaged. Motorcycle Troubleshooting Guide. The noise was getting annoying so I put the stock mufflers back on. Take the old battery completely out of the system. I was riding the other day and it just seemed to not want to rev up. Showing 1-26 of 26 messages. a valve which allows more or less fuel to go into an engine and so changes the power with which…. It's very helpful to keep a log book for your motorcycle where you can log changes to the jetting, the temperature, altitude etc and the result. With the change in pipes you made it could well be a main jet change is in order. I cut a 1/2" hole on top of the air box, and I did an exhaust mod by cutting the end of the spark arrester for a little better exhaust flow. That's all I did, changed the pipes. If I try to go full throttle it goes down to almost nothing at all and sputters? Is it something to do with the fuel or the air filter? Please help!. I'm 100% sure Charging system-good. They will check out ok via an electrical meter test but not be ok. Culprit? the web is full. As I opened the throttle all the way I could see gas coming up past the needle. For pit bikes with. Took it back there today and they test rode it and said it was normal - I call BS. stock tc88 motor, rinehardt true duals, mikuni 42mm carb with base line jetting, new intake gaskets, d&m spike air filter (tried running it with out the spike to make sure) new screaming eagle plugs and wires, gap is set perfect, compression is. I twist just enough (closed) to get a very slight "stick". If the engine has a flat spot, or is popping/sneezing in the air cleaner, it can indicate a lean condition. Rode down the pit but every time I got to about 50% throttle the front cylinder would drop again. 98 vmax 600sx sputtering at full throttle There have been times it acted a little strange with backfires and such but otherwise, ran well. Same thing happens if you are in a low gear going around a corner at low rpm and you try to give it throttle it just bucks and hesistates really bad untill you get past a certain rpm. I rode for about 50 miles and then out of nowhere I started sputtering and backfiring. Not sure how or why, but it has, all by itself, returned to its original condition of starting, idling fine, running well for a few minutes, then suddenly starting to sputter when stepping on the throttle. After it starts the sputtering i have to get to about second gear 4K RPM to make it stop. To verify that there is air inleakage around the throttle shaft, first remove the throttle arm, then clean the area around the shaft with MEK, acetone or toluene. What causes 98 dodge ram charger to backfire and hesitate when full throttle? 207 208 209. This happened a few times sporadically, only from about 4-6000rpms, and only pronounced from first to third gears (maybe felt it in 4th ) where the engine sputters with light, slowly increasing application of throttle. “If you lose one signal from the Hall. It accelerates smooth, but after a few blocks at top speed, it starts to sputter, bogs, and will die unless I let go of the throttle. acceleration Sputtering and popping was the first indication of trouble with mine (see: Another one not running). If I shut it off for 20 minutes, the scoot will fire up, run great, but at full throttle it will die again after just 2-3 house lengths. May backfire or. when i only go half throttle it is just fine. Mercruiser 4. 4) Main Jet – This circuit affects the mixture from 1/2 throttle to full throttle. Then it started returning within two days and went back too how it was, long start and backfire when releasing throttle but not loud but consistent after another kind of like a growl.