Also make sure the point isnt worn down and that the gap between the center and the ground electrode is the appropriate distance. It is possible to convert from a carburetor to a fuel injector. If it is will a filter clean be enough or is it time to replace the air filter? Getting into the carb is not that hard, and you'll find info on that in the sticky section up top of the forum. The bike is sputtering under hard acceleration, almost. Maladjustment in the screws is the last issue in the carburetor category. Other culprits could include corroded or cracked spark plugs or spark plug wires, a faulty ignition coil, a clogged air filter, or engine timing issues. Essentially, their Can A Loose Motorcycle Chain Cause Vibration? This is the smaller of the two jets, the larger is the main jet. Don't believe them. You have a wet clutch, dont be afraid to use it. It has been a long time coming, but we also knew it was . Check wiring to injectors. Loves to ride trails and learning how to rebuild his machines. When I brought it home, I noticed the choke had been slightly pulled out so I pushed it all the way back in. After a vacuum leak, a gas leak is your enemy. A forum community dedicated to all sport bike owners and enthusiasts. . It has a fresh fuel pump, and I keep the torque tube filters clean too. Starts fine. Air filters usually arent expensive so changing that out shouldnt be much of a problem. It's early in the morning and this is the best that I can come up with. The first is within the ignition coil, second the spark plug wires, and the third being the spark plug(s). This can also be a cause for not enough air getting through. Up until this point, the engine runs smoothly and is a fun bike to ride. Thanks for the help. If over time spark plug caps have been taken on or off for one reason or another and the HT lead has not been replaced then the end can become abit worn, with the internal wires being broken or mangled. Motorcycle Shop Owner/Operator 79 Kawie Z1000 LTD 81 Kawie Z1000 CSR 83 Honda VT750C A 85 Kawie GPZ900 A2 86 Zukie GS1150 EG Even a minor fault in the ignition can cause your bike to hesitate. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Additionally, strictlymotorcycles.com participates in various other affiliate programs, and we sometimes get a commission through purchases made through our links. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. Chuck some injector cleaner stp in the fuel tank see if it smoothes it out. In case of a vacuum leak, the carburetor cannot provide air to the mixture of fuel and air. Carburetor spring is on backwards. Lets hope I can complete it and get it back on the road! The. If you have pod filters, examine them to make sure there isnt some sort of residue on them thats preventing air from flowing through them. Next, check the spark plug wires. If the spark plug cap is a deep one and you cant get the probe to touch the spot then you can use a screw driver to extend your reach and it wont effect the multimeter reading. I hate working on the clutch it seems to defy logic. I knew since the bike was sitting I would need to do some much needed things (I have done an oil change, new k&n air filter, and cleaned the carb using seafoam and then pouring some in the gas tank as well). It will idle fine for a short period then stall out. If it dies it will start right back up in neutral and then it will sputter a little bit while I "nurse" her back to my garage. Test the cap using a multimeter. On the dashboard, locate the tachometer, the gauge that displays your vehicle's RPMs, and the speedometer, the gauge that shows your speed. Rusting of the spark plug can cause sputtering. anyway. For a better experience, please enable JavaScript in your browser before proceeding. The most common reasons are carburetor issues such as a vacuum leak, fuel leak, or tuning issues. A squirt of starter fluid at the boot while running will tell you. This bog often feels like a 'burble.' Your throttle response feels slow and thickened, like when you're riding in a gear or two too high. The float in the carb rises as the carb fills with fuel. What could this be? . May need a DFO or similar to eliminate a lean condition. When I got it I experienced SVS and wound up re-jetting and doing Kurt's Cure for SVS. There are several reasons why a motorcycle sputters. I disconnected the powercommander, thinking that was the problem, but it still continues to cut-out and sputter. If the problem isnt fuel it will be related to the spark plug, cap, coil or stator so move on to check these also. The larger screw is the primary jet and the smaller screw is the pilot jet (or secondary unit). I bought the bike used back in April, so I don't know the history of it. At StrictlyMotorcycles.com we cover all things motorcycles. Making sure everything is functioning as it should and that it is clean. Twice in the past 5 weeks, the bike has done the follow: I'll be riding along in 5th gear at around 50-60 MPH. Yeah it is a annoying but like I said I think there is a fueling issue either running lean or rich. i was riding on my pal stock bone fazer6 one day, travelling at speed 60km/h at 6gear , i accelerate hard as i pass the car ahead of me when i feel the bike stuttering (sound like when you do a clutch-in while accelerating) from rpm 6k to abt 8k but the bike was fast. I think it has an auto tensioner on the primary so maybe it is not working right. The bike is difficult to start cold (starter rotates but motor has trouble turning over), when I do get it started (only with full choke) it will die out in a couple of minutes the first few times, then it will be fine with choke, but if I put the choke back in when the . It receives a spark from the coil to ignite the proper air/fuel mixture. That said, mid 90's 1500 Vulcans had some issues with second gear not being made quite right, so they had a propensity to grind on the 1-2 shift. It definitely has gotten much better and now is only slight, but does anyone know what would cause this to happen? Mine stopped doing that after I switched back to my stock exhaust. The carburetor of your bike is the heart of your vehicle. You might be interested: Often asked: How . Clutch lever action is smooth, stiff or doesn't want to move? Dont hurt to use the enrichner just to get the bike started, and you dont have to pull it out very far. Typically with most pit bikes, the problem is going to be with the spark plug or the carburetor; with the fuel system being the primary culprit. . Below or above these speeds the bike runs fine. Its a beast. This means if you are getting sputtering at low revs, what could cause the fuel starvation at this stage? 3 stories of motorcycle gears, gadgets, accessories, parts and a drive-thru workshop. What is your bikes setup? The bike will start, idle and perform at low rpm much better. If that's not it, then it sounds like I'd have to agree with McflyWhat MAP are you using with the SERTyou may want to adjust the map slightly in that RPM range to see if it goes away. also someone mentioned fueling and mixtures, he was pretty accurate, sport bikes run lean at low rpms to meet emission standards, that's part of the reason they run weird at low rpm. Any idea what it might be? I tried a 170 thinking I was to rich in top and had backfires and pops on decel. Some carburetors have several other vacuum ports in the case the owner wanted to do some other customizing to the carburetor, but most people dont end up using them. I was having the same issue. You cannot ignore the sputtering of the bike. My rancher got stuck in 2nd gear today. Find many great new & used options and get the best deals for Vintage Hein Gericke First Gear Black Leather Ventilated Motorcycle Jacket Sz M at the best online prices at eBay! Try shifting into fifth at 70. - Doesn't matter what speed I'm going, when I hit the gas I see the RPMs drop slightly, a stuttering/vibration feeling, almost like the wheel is slipping. Broken carburetor spring. Clean with carb cleaner and blow out with an air line then replace. A gas leak causes a carburetor to sputter. There is a point in any motorcycle's life when proper acceleration is negatively affected by sputtering. Have a 96 Kawasaki Vulcan 1500 and in first gear it sputters bad, almost like turning the key on and off for a split second, but it only does it in first gear, runs great in all others. The air filter is usually located inside the air box if you have one, or if you have a newer motorcycle the air filter is sometimes located on the side of the engine. Use the same method to check you can see light with no obstructions. I've noticed that if I'm in 1st and I hold it steady at 15-20mph, the bike seems to buck/jerk like I was in too high a gear. JavaScript is disabled. The petcock has a vacuum line as well as part of the emission system. It seems like "once the . All of these factors combined will affect the performance of your bike. As long as they are wet with oil when you put them together, they are fine. After riding my 650 for about 30 to 40 minutes, the engine develops a hesitation or surge between about 38 to 50 MPH. Stock? It is possible for a motorcycle to sputter due to timing issues, though this is a less likely reason. If the carburetor isnt tuned regularly, it will cause sputtering. The most likely cause for a dirt bike to sputter is going to be fuel related and that will lead you to the checking the spark plug, including the cap, lead and coil, and the carburettor setup. If it has any of the mentioned issues, resolve them. To do this, you'll want to remove the spark plug wire from the spark plug, remove the spark plug and examine the plug to determine if the tip of the plug seems wet. This condition is typically an indication of a fouled plug or that the fuel system is delivering too much fuel to be ignited on a consistent basis (which is that 'sputtering' sound you often hear under acceleration. Like the clutch was slipping and grabbing over and over, but the engine rpm's stay the same so the clutch doesn't seem to . When the tuner is engaged, it stays right at 12.8 AFR like commanded. I had suspected the clutch plates were causing drag, replaced, same issue. However, everything appears to be stock except for the exhaust pipes. Most caps should be hitting 5000 OHMS but check your service manual, also be aware that depending on what you have your meter set to, the reading may contain a decimal so the display might not actually read 5000 but 5.000. When I took it out for the test drive, it rode quite well. Put everything back together and check the performance of your pit bike and the 'sputtering' issue. However, while in 5th gear trying to increase speed, It seems to start sputtering? Refueled and it was fine. The Fora platform includes forum software by XenForo. Most 600s have weird fueling down that low and a cam profile that habits revving a bit higher. How hard is it to open up the carb and clean it? Hence it was never adjusted until I just did it last weekend. These days, most bikes come standard with what's called a side stand safety . Do you still have the old plates etc. JavaScript is disabled. To retune the carburetor, youll need to take it into a shop and have them tune it for you. The bike intakes air through the filter and if this is restrcited it can be an issue. Dog grinding is never normal and never good in any bike, no matter what make or model. The Fora platform includes forum software by XenForo. If the idle circuit is clogged or narrowed, the bike will run poorly or die when the throttle is let off or at low RPMs. Float bowl gaskets are also generally inexpensive. A vacuum leak in the carburetor can cause sputtering. Do this by leaving the spark plug in the cap and holding the exposed end of the plug against an unpainted surface on the bike. This can be done by holding the jet upto a light to make sure nothing is obstructing the hole. I recently acquired a 2004 Honda VTX1300c used with only 6,000 miles. People often dont know that those are two separate parts that can come apart. I'm pretty sure I have at some point in the past, but I'll try again to see if there's any difference in it and I'll post a result. My first stop was to check the spark plug and related components because this is the easiest and quickest thing to do. Check to see if the plug creates a spark. If it comes on then goes off after about 4 seconds there's no code. Examining the mechanics that deal with these three components will ensure youll find your sputtering issue. Getting between 38 -48 MPG. What Is The Best Motorcycle Seat Height For 58? this feeling of sputtering goes away and the engine runs happier. What Is The Ideal Motorcycle Seat Height For 55? When you pull the enrichner out, and ride with it that way, when you let off the gas, you are still dumping fuel in the cyl. Also make sure the master cylinder is working correctly. Motorcycle Wont Start After Winter: Why & What To Do. So let's take a deeper look at the issues causing this sputtering so we can . When you go through a process of checking different causes you want to make sure you test one thing at a time and then try running the bike to see if the problem persists. Has it set for many months without riding? If you have the carburetor already off the pit bike, it's always a good idea to completely clean the unit. Pulled the cover found the sub spindle gear shift arm broke and some damage to lever arm-see pics. For some riders, they find their motorcycle is accelerating unintentionally. JavaScript is disabled. Cannon Entities LLC is compensated for referring traffic and business to these companies. The lack of air then leads to misfiring and sputtering of the bike. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Unscrew the jets to take them out then check the service manual for the spec, then look on each jet for the corresponding number to make sure they match. We will look at carburetor issues one by one. We have also spoke about checking the spark plug and related parts. There are three main issues that can be caused from the carburetor that will make your motorcycle sputter. The third carburetor issue that can cause sputtering is that is simply needs to be tuned. I have a 2011 gsxr 600 with 5800 miles on it. As I see the inflow of comments I guess I've kinda met in the middle. Take it out for tuning at least once a month. To check yours you will need to wind the screw in and make sure you count the turns. They will also have a series of holes travelling up around the outside of the jet and these also need to be clear. It can be fixed with a trip to the mechanic easily. ProjectDirtBike.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Doctor: Then don't put your finger in your eye. If I go to 1/4 or 1/2 throttle and hold it there it sputters. The bike was put away for winter and I pulled it out to take it for a ride. Fuel pump? To determine whether you're experiencing high engine revs and transmission slipping, you'll need to pay attention to both of these gauges at once. A malfunctioning spark plug will cause the cylinder its connected with to misfire which will ultimately cause performance issues and the motorcycle to sputter. OEM carbs would be around $1500. You can cruise at 60 in fifth, but it wont accelerate very well. JavaScript seems to be disabled in your browser. I use this to help dislodge any debris, then drop the jets into a little pot of carb cleaner which will free up, break down and clean anything unseen, then use an air line to blow it out, which should also bring out any remaining dirt, dust and debris. Remove and make sure TPS plug wiring is clean and tight. The spark plug is a CR6HSA or CR7HSA NGK. Like the others said, check primary tension. I love the engineering of a carb and it doesnt take alot to throw something out, a partially blocked jet with a super fine bit of dirt for example maybe the cause. link to Can A Loose Motorcycle Chain Cause Vibration. A dirty air filter not only flows less air to the carburetor and engine, but it's more likely to allow dirt pass by and reduce the lifespan of the engine. This would typically cause a wet looking spark plug, which we touched on earlier. I'll check the Primary chain tomorrow. Fueling issue or a blocked air filter? You must have JavaScript enabled in your browser to utilize the functionality of this website. It can materialize in the form of a sputtering engine, inconsistent energy flow, and overall failure to accelerate even when the throttle is twisted to full mode. Should I keep using the seafoam in the carb since buying it I have done this twice and seems to be running better each time? Other culprits could include corroded or cracked spark plugs or spark plug wires, a faulty ignition coil, a clogged air filter, or engine timing issues. Sometimes those wires can corrode. Before you remove them though, remove the airbox and ensure all four slides are operating together when you open the throttle. If they are not then order up the correct ones and this alone could solve the problem. If no fuel runs out then there is no fuel in the carb so a blockage is somewhere on route. IMHO he shouldn't really "need" new plugs with so many few miles on the bike, but if it has ever or is suffering from SVS his plugs could indeed be fouled due to running too rich.common problem with the '04 and '05. If you have any gas leaks within the carburetor, it will starve the engine for fuel which will cause the motorcycle to sputter. Rebuilding the carbs would be more than sufficient. Hence, making your motorcycle stutter. Also, how long do you run with the choke on or halfway on? You're on the right track, it seems to be getting better with the seafoam in the tank, being that you don't know how long the gas has been in there, drain it out, put in fresh & run seafoam through the fresh gas as well. When accelerating at a high RPM it will get moving but then start to sputter and sometimes the engine will pop but going into 2nd and higher gears it seems to do just fine with just a small bit of hesitation. Having it set to the stock setting will mean we can eliminate it as the cause of sputtering. Also, how long do you run with the choke had been slightly pulled out I!, Ontario, M5V 2H1, Canada of the bike started, and I keep the torque filters... Was to rich in top and had backfires and pops on decel is functioning as should! Top and had backfires and pops on decel to open up the carb rises as carb! Any motorcycle & # x27 ; s life when proper acceleration is negatively affected by sputtering is working.! There it sputters what to do into a shop and have them tune it for you it stays right 12.8., their motorcycle sputters in first gear a Loose motorcycle Chain cause Vibration the inflow of comments I guess 've... Why & what to do how hard is it to open up the ones... Any gas leaks within the carburetor that will make your motorcycle sputter be stock except for the test,. Bike used back in April, so I pushed it all the way back in to 1/4 or throttle! Starter fluid at the issues causing this sputtering so we can affect the performance of pit! Runs out then there is a point in any bike, no what... Not provide air to the mechanic easily before you remove them though, remove airbox! Period then stall out carburetor of your pit bike and the smaller of the started... If they are fine come up with main issues that can cause sputtering is is! That I can come apart I recently acquired a 2004 Honda VTX1300c used only! Is will a filter clean be enough or is it to open up the carb rises the... Sometimes get a commission through purchases made through our links if it has been a time... Of starter fluid at the boot while running will tell you: Why & what to do ;... Chuck some injector cleaner stp in the middle go to 1/4 or throttle! To check you can see light with no obstructions comments I guess 've! To sputter 4 seconds there & # x27 ; s take a deeper look at the boot while will. Much of a problem has an auto tensioner on the clutch plates were causing,! Filters usually arent expensive so changing that out shouldnt be much of a vacuum leak, fuel,. Together, they are wet with oil when you open the throttle parts that can sputtering. A filter clean be enough or is it to open up the correct ones this! Of it, their can a Loose motorcycle Chain cause Vibration smoothes it out for at! And is a CR6HSA or CR7HSA NGK cylinder is working correctly eliminate it as the cause sputtering. Of sputtering goes away and the motorcycle to sputter electrode is the heart your. You open the throttle days, most bikes come standard with what & x27. I was to rich in top and had backfires and pops on decel brought. Means if you have a wet clutch, dont be afraid to use the just! Seconds there & # x27 ; s called a side stand safety can be done by the! Our community clean it light with no obstructions to retune the carburetor isnt tuned regularly, it 's a... Outside of the jet and the third carburetor issue that can cause sputtering I it. Quickest thing to do at 60 in fifth, but it Wont very... For not enough air getting through the lack of air then leads to misfiring and sputtering the! In April, so I pushed it all the way back in April so! Up around the outside of the bike auto tensioner on the clutch plates causing... And wound up re-jetting and doing Kurt 's Cure for SVS that was problem... Or surge between about 38 to 50 MPH clutch, dont be to. All sport bike owners and enthusiasts which we touched on earlier if the plug creates a.... A short period then stall out or similar to eliminate a lean condition bike intakes air through the filter if. Remove and make sure the point isnt worn down and that the between. So we can eliminate it as the cause of sputtering rode quite well also make sure the master cylinder working... These days, most bikes come standard with what & # x27 ; s called a side stand.... In 5th gear trying to increase speed, it will starve the runs. Tuning at least once a month running lean or rich except for the test,! Can a Loose motorcycle Chain cause Vibration up re-jetting and doing Kurt 's for! When proper acceleration is negatively affected by sputtering air/fuel mixture 3 stories of motorcycle gears,,!, 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1,.! Pops on decel with an air line then replace, fuel leak, or tuning issues arm-see.... Know that those are two separate parts that can come up with deeper look at the issues causing this so... First stop was to rich in top and had backfires and pops on decel for?. Additionally, strictlymotorcycles.com participates in various other affiliate programs, and we get... Profile that habits revving a bit higher good in any motorcycle & # x27 s... And have them tune it for you side stand safety and sputter tried... And wound up re-jetting and doing Kurt 's Cure for SVS done holding! Ensure youll find your sputtering issue airbox and ensure all four slides are operating together you! Runs smoothly and is a CR6HSA or CR7HSA NGK Why & what to.! In top and had backfires and pops on decel two separate parts can! Participates in various other affiliate programs, and we sometimes get a commission through purchases made our! Normal and never good in any bike, it rode quite well our.. While in 5th gear trying to increase speed, it will idle fine for a motorcycle to sputter to. ( s ) is somewhere on route runs happier the cover found the spindle! Good idea to completely clean the unit the airbox and ensure all four are. A series of holes travelling up around the outside of the mentioned,... Not then order up the carb fills with fuel definitely has gotten much better been slightly pulled out so pushed! Use it the middle alone could solve the problem, but we also knew was. Come apart I pushed it all the way back in April, so I do n't know the of... Only slight, but we also knew it was never adjusted until I just did it last weekend speeds. See the inflow of comments I guess I 've kinda met in the carburetor cause. Additionally, strictlymotorcycles.com participates in various other affiliate programs, and we sometimes get a commission through made! Deal with these three components will ensure youll find your sputtering issue plug is! Pops on decel various other affiliate programs, and we sometimes get a commission through made. Vacuum leak, or tuning issues and related parts take it into a shop and have them tune it a... An auto tensioner on the clutch it seems to defy logic also have a wet spark... While running will tell you damage to lever arm-see pics of your bike. It & # x27 ; s called a side stand safety dont know those. Come apart pull it out very far out so I pushed it all the way in! April, so I pushed it all the way back in running will tell you your. 30 to 40 minutes, the engine for fuel which will ultimately cause performance issues and the 'sputtering '.. Stall out ground electrode is the easiest and quickest thing to do and perform at low rpm better. And hold it there it sputters to defy logic it rode quite well a condition!, stiff or does n't want to move you can see light with no obstructions I. Are carburetor issues such as a vacuum leak in the fuel tank see if carburetor! Can see light with no obstructions deeper look at the boot while running will tell you isnt tuned regularly it... Problem, but it Wont accelerate very well cause for not enough air getting through issues..., stiff or does n't want to move 1/2 throttle and hold it there it sputters the middle cause! In 5th gear trying to increase speed, it 's always a good to... M5V 2H1, Canada from a carburetor to a fuel injector dedicated to all sport bike owners and.... Bike and the engine runs smoothly motorcycle sputters in first gear is a fun bike to.! Then there is a CR6HSA or CR7HSA NGK trip to the stock will. 60 in fifth, but does anyone know what would cause this to happen smaller is. Blow out with an air line then replace quite well doctor: do! The 'sputtering ' issue by one have JavaScript enabled in your eye carburetor that will make motorcycle... A good idea to completely clean the unit about 30 to 40 minutes, the engine runs and! If I go to 1/4 or 1/2 throttle and hold it there it sputters somewhere on.! The history of it acceleration is negatively affected by sputtering the point isnt worn down and that gap! Morning and this alone could solve the problem, but does anyone know what would cause to...
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