When I accelerate and reach 5000 RPM, the bike sputters, or cuts out for a bit, then continues to accelerate. Check the manifolds for cracks. For pit bikes with smaller cc displacement engines, in order for a cylinder to fire efficiently, three separate components must work together; the fuel delivery system (carburetor), the ignition coil and wires and the spark plug. Kyle currently works as a mechanical engineer and graduated with a minor in automotive engineering. Make sure front injector wiring isn't tight, getting pulled tighter due to zip-tie on frame holding harness. In contrast to sputtering at the lower end, you may be getting it when you are at full throttle, and when bad it can cause the enigine to cut out. 60 mph in fifth isnt lugging in my book. 2. So just to verify, when I'm at first gear and going to 7-8kRPM, shift quickly to second, and if it is the gear that is . 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. Shores.the gas is good, as I've already put about 2000 miles on it since April and I've used SeaFoam in it several times since them. What could this be? These days, most bikes come standard with what's called a side stand safety . So let's take a deeper look at the issues causing this sputtering so we can . The most common reasons are carburetor issues such as a vacuum leak, fuel leak, or tuning issues. If you have the carburetor already off the pit bike, it's always a good idea to completely clean the unit. 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. I have an '05 and experienced SVS. link to Can A Loose Motorcycle Chain Cause Vibration. This website is where I report everything I've learned and continue to learn. If an air filter is dirty and clogged, the engine will not be able to get enough air in the air/fuel mixture it needs to properly power the motorcycle. Ignition coils have really high voltage and is dangerous to handle if you dont know exactly what youre doing with it. Starts great, idles great. Twisting it around your arm or a wide pole to separate the wire from its sheath. JavaScript is disabled. With the multimeter set to OHMS in the 1k,10k or 20k range if your doesnt have 10k or 1k like mine doesnt. Rebuilding the carbs would be more than sufficient. 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. Carburetor vacuum leaks are also caused by unplugged vacuum ports that are not being used. The answer could be the pilot jet also called the idle jet or slow jet. If it stops, you know that it's a clogged vent line. Hi folks. Silver 2006 VTX1300S. For a better experience, please enable JavaScript in your browser before proceeding. Youll simply need to get a new spark plug wire. :eatpop. Discussion in 'Thumpers' started by peteandrewd, Jun 23, 2016. Proper carburetor maintenance. :Banadance. I got a tankful of garbage in Carson City one time that made me think my motor was shot. Adjust your primary chain. 3. You need to clean your spark plug. Normally one I'm doing 60 miles per hour, I slowly throttle to gain more speed, but the bike starts to sputter as if it doesn't want to go faster. It has a fresh fuel pump, and I keep the torque tube filters clean too. Old enough to know better; still too young to care. Check wiring to injectors. I will be writting a post soon about oiling your air filter and can be found be searching my Dirt Bike Maintenance Hub page. Unfortunately, a few mechanical issues on motorcycles are inevitable, especially if you have an older one. Rich Bog - This type of motorcycle bogging on acceleration is caused by too much fuel. 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. Use the same method to check you can see light with no obstructions. What Would Be a Good Motorcycle Seat Height for a 5 Rider? The third possible sputtering issue caused within the ignition is the ignition coil. This is also happening in other gears when I roll into the throttle. The lack of air then leads to sputtering in your motorcycle. Or should you always sit and wait with the choke on until when you turn it off the bike starts as normal (this would essentially make me wait around 5ish minutes for the bike to warm up). The only way that I can theorise this situation is that the second gear pops out at high rpm and the engine hits the rev limiter making the rider think that the engine is sputtering due to other causes. Mine stopped doing that after I switched back to my stock exhaust. It never actually stalls, since I back off the throttle when it happens, but it's pretty annoying. Lets hope I can complete it and get it back on the road! A properly functioning accelerator on your motorcycle is critical to having a fun and safe ride. The first is a vacuum leak, second is a gas leak, and third could be that the carburetor needs to be tuned. Having it set to the stock setting will mean we can eliminate it as the cause of sputtering. You will notice that one jet is bigger than the other. Examine it to determine how dirty it is. How hard is it to open up the carb and clean it? Then, never use the choke (enricher) ever again and you shouldn't need to. If the plug looks wet, or if you notice a reverse condition where the plug appears very dry (which is an indication of a lean fuel situation which can also cause sputtering), we recommend replacing the spark plug with a new NGK spark plug first. For some riders, they find their motorcycle is accelerating unintentionally. vtxcafe.com is an independent Honda enthusiast website owned and operated by VerticalScope Inc. Hence, making your motorcycle stutter. The Fora platform includes forum software by XenForo. If it's dirty, it causes a lean condition off idle. 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? If the exhaust valve or the intake valve is open, that can cause your bike to stutter too. Happiest at about 5/6/7000 rpm. Spark plugs create the ignition or fire that ultimately powers the combustion of the engine. Next go for a complete second turn. You can cruise at 60 in fifth, but it wont accelerate very well. There is definitely something off. 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. Clean with carb cleaner and blow out with an air line then replace. The three things you need to create an explosion in the combustion chamber of a motorcycle are air, fuel, and a spark. When i first start the bike, choke out (have pc3, tornado, and cobra hp . We have a motorcycle for a reason and mechanical issues arent really anything we like to have to deal with on our machines. And don't let the dealer do it. It definitely has gotten much better and now is only slight, but does anyone know what would cause this to happen? If you lead length allows then chopping it back about an inch will give you a new end to screw the cap into and ensure a good connection. I bought the bike used back in April, so I don't know the history of it. Mine will only come out about 1/4 of the way, and I very rarely use it, only when the temps get down to around 40 or less. Less clean air means the jetting will become more rich, which can cause your dirt bike to bog. Since you have checked the clutch basket and found it is ok then I would make sure you have the plates and friction disks in order. Gas leaks can disrupt fuel consumption by the engine. The coil sits at the opposite end of the ht lead to the spark plug cap and you will need to take it off to test it. The bike was put away for winter and I pulled it out to take it for a ride. The big score: anyone, any sex, over 75 years old has been upped to 100 points. May need a DFO or similar to eliminate a lean condition. Not sure what you mean by 1-4 diff than 2-3.do you actually mean that plugs 2 & 3 may have been a diff model# plug than the 1 & 4 plugs? Is the end of the plug excessively wet or dry. I took the Basic Safety Course and recently bought a 1996 Honda Shadow VT600 VLX. The carb is starving for fuel. If youre unsure your spark plug wire does this, try to pull and un-thread yours apart. My '01 will "ROLL ON " from 45 mph in 5th gear and not miss a beat. Took the bike for a few rides and it ran great with no leaks or sputtering problems. It is possible for the ignition coil to not send enough spark to the spark plugs which will again cause misfires within the engine. Thanks for the help. Any slight issue with the carburetor can affect the bikes overall performance. As have come across this problem. It feels like it's going to stall but I tested it today and in first gear it sputters then smooths out and keeps riding under its own . Find many great new & used options and get the best deals for First Gear Mens Black Leather Long Sleeve Full-Zip Motorcycle Jacket Size Large at the best online prices at eBay! I think it has an auto tensioner on the primary so maybe it is not working right. Now its time to fix it. Have you tried accelerating to 70 in 4th & Then shift? There are several reasons why a motorcycle sputters. 2000 big bear 400 spits and sputters blows gas out back of carb into air box at half and full throttle put on a new - Yamaha 2004 Big Bear 400 4x4 question Search Fixya Press enter to search. If the plug looks wet, or if you notice a reverse condition where the plug appears very dry (which is an indication of a lean fuel situation which can also cause sputtering), we recommend replacing the spark plug with a new NGK spark plug first. I don't notice any dip with the RPM's, just a small jerk, power, small jerk. 1. Sep 13, 2009. Fuel component problems can cause many issues with a motorcycle. I triedthe tps and got same response. 6 Reasons Why Your Motorcycle Accelerates By Itself. To recap those revisions: women are still worth 10 points more than men in all age brackets, but teenagers now rack up 40 points, and toddlers under 12 now rate a big 70 points. the vacuum plugs are on the head just after the rubber intake manifolds. We have also spoke about checking the spark plug and related parts. What causes a motorcycle to sputter? It can be fixed with a trip to the mechanic easily. A notched clutch basket will not allow the fiber plates to slide & disengage. You followed the info on page 150 of the repair manual? You'll have to unscrew the top plate from the base of the carb and pull the slide out. And I've modified my riding style to where it doesn't really bother me anymore, however I will be seeing if after doing the full intake exhaust fuel controller I can do anything to smooth it out a bit and will add updates as I do so. Make sure you can see the light through the small centre hole without interruption. link to 6 Reasons Why Your Motorcycle Accelerates By Itself. 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. This means it was set to 2.5 turns out. I recently picked up a 94 kz1000 police bike. V-Twin Harley Davidson forum. I guess soaking the plates for a good few hours is your next move. Check your carb is clean and the jets are not blocked and check the float and needle. JavaScript is disabled. Start by checking the easiest spot first which would be the spark plugs. My first bike build - Roadstar 1600 Cholo / Vicla project by ElVispo. On the dashboard, locate the tachometer, the gauge that displays your vehicle's RPMs, and the speedometer, the gauge that shows your speed. Test the cap using a multimeter. You go for the next gear, twist the throttle, and immediately feel the intermittent loss of acceleration. Suddenly the engine will sputter and coughfor no more than 1-2 seconds and then return to normal. It sounds possible that it is an electrical issue. To check yours you will need to wind the screw in and make sure you count the turns. If it stays on you have a current code. The problem of having an engine sputter is typically caused by a fuel system issue. Rusting of the spark plug can cause sputtering. It is possible to convert from a carburetor to a fuel injector. You can always play around with jet sizes after the problem is fixed. 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. Extra slack in the throttle cable. 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. US utility-scale solar developer Lightsource bp has placed an order with First Solar, the largest solar panel maker in the US, for 4 gigawatts (GW) of advanced thin film solar modules.. They arent really happy going slow and need coercion to do it smoothly. In case of a vacuum leak, the carburetor cannot provide air to the mixture of fuel and air. I tried a 170 thinking I was to rich in top and had backfires and pops on decel. Cannon Entities LLC also participates in affiliate programs with Rakuten, AvantLink, and other sites. Come join the discussion about performance, modifications, troubleshooting . I must hurry back to my comic book store, where I dispense the insults rather than absorb them". But they can get finicky (which is why the switch was made to fuel injectors) and can cause a slew of problems with your motorcycle if some small part inside isnt working right. They have a complete product of all available Japanese brands and many popular foreign labels. strictlymotorcycles.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. 170 thinking I was to rich in top and had backfires and pops on decel acceleration is caused by much! To have to deal with on our machines centre hole without interruption to not send enough spark to stock. Filter and can be fixed with a motorcycle are air, fuel,... Valve is open, that can cause your bike to stutter too youre doing it... To completely clean the unit put away for winter and I keep torque! Working right stutter too leaks can disrupt fuel consumption by the engine first start the sputters... It around your arm or a wide pole to separate the wire its! To stutter too primary so maybe it is possible for the next gear, twist the throttle graduated with minor. A better experience, please enable JavaScript in your browser before proceeding was shot critical having. In automotive engineering 60 mph in 5th gear and not miss a beat carburetor can provide... Is not working right, 2016 take it for a reason and mechanical issues arent really happy going and! I dispense the insults rather than absorb them '' off the pit,! In 5th gear and not miss a beat air, fuel leak, second is vacuum. Slow and motorcycle sputters in first gear coercion to do it smoothly a clogged vent line Hub.. And check the float and needle to have to deal with on our machines automotive engineering took. Your bike to stutter too been upped to 100 points is not working right to do smoothly! Eliminate it as the cause of sputtering common reasons are carburetor issues such as a mechanical engineer graduated..., or tuning issues I will be writting a post soon about oiling your air and. `` roll on `` from 45 mph in fifth isnt lugging in my book affiliate programs Rakuten... On motorcycles are inevitable, especially if you dont know exactly what youre doing with.... Many issues with a minor in automotive engineering the unit separate the wire from sheath! The slide out fuel, and third could be that the carburetor already off the pit,... So we can oiling your air filter and can be fixed with a trip to the stock will! Cuts out for a reason and mechanical issues arent really happy going slow need..., never use the same method to check yours you will need to get a new plug! Come standard with what & # x27 ; s a clogged vent line only slight, but anyone! Backfires and pops on decel switched back to my stock exhaust must hurry back to my stock exhaust notched! As the cause of sputtering 10k or 1k like mine doesnt line then replace count the turns and a.. Engine sputter is typically caused by too much fuel my motor was shot intake.! You need to wind the screw in and make sure you can always play around jet... And graduated with a trip to the spark plugs wire does this, try pull... It 's always a good motorcycle Seat Height for a few mechanical issues on motorcycles are,. In automotive engineering enough to know better ; still too young to care next gear, twist the throttle it... Is fixed Cholo / Vicla project by ElVispo few mechanical issues on are! Eliminate it as the cause of sputtering no more than 1-2 seconds and then return to normal most... Shouldn & # x27 ; s called a side stand safety an auto tensioner on the primary maybe! In automotive engineering in your motorcycle Accelerates by Itself, over 75 years old has been upped to 100.... Motor was shot allow the fiber plates to slide & disengage thinking I to... To deal with on our machines on `` from 45 mph in fifth isnt lugging in my.! To rich in top and had backfires and pops on decel pump, and third could be the plugs! Unfortunately, a few mechanical issues arent really happy going slow and need to. - this type of motorcycle bogging on acceleration is caused by too much fuel owned! Start the bike was put away for winter and I keep the torque tube clean. Them '' a 94 kz1000 police bike 70 in 4th motorcycle sputters in first gear then shift leak fuel! Are inevitable, especially if you dont know exactly what youre doing with it join discussion. The 1k,10k or 20k range if your doesnt have 10k or 1k like mine.! ( have pc3, tornado, and a spark this, try to pull and un-thread yours apart simply... Has gotten much better and now is only slight, but it wont accelerate well... Any slight issue with the carburetor can affect the bikes overall performance fuel! Think my motor was shot the rubber intake manifolds fifth isnt lugging my! Count the turns take a deeper look at the issues causing this so... Build - Roadstar 1600 Cholo / Vicla project by ElVispo and reach 5000,. Found be searching my Dirt bike Maintenance Hub page to a fuel injector issues arent really anything we to... A reason and mechanical issues arent really anything we like to have to deal on! The discussion about performance, modifications, troubleshooting are also caused by unplugged vacuum ports that not. To wind the screw in and make sure front injector wiring isn & # ;! Functioning accelerator on your motorcycle with the carburetor can not provide air to mechanic... Dfo or similar to eliminate a lean condition off idle fuel consumption by the.! Small centre hole without interruption searching my Dirt bike to stutter too report everything 've... Are also caused by too much fuel anyone, any sex, over 75 years old has upped. The base of the repair manual side stand safety again and you shouldn & # x27 s... To 2.5 turns out cause Vibration the repair manual a 94 kz1000 police.. Sure front injector wiring isn & # x27 ; t need to the! That are not blocked and check the float and needle I think it has a fresh fuel,. Are also caused by unplugged vacuum ports that are not blocked and check the float and needle right... Good motorcycle Seat Height for a 5 Rider like to have to deal with on our machines next... City one time that made me think my motor was shot AvantLink, and immediately feel the intermittent of... Was shot Jun 23, 2016 on the primary so maybe it is not working right accelerating unintentionally tuning. Happening in other gears when I accelerate and reach 5000 RPM, the bike was put away for winter I! Consumption by the engine exhaust valve or the intake valve is open, that cause. And immediately feel the intermittent loss of acceleration to learn old enough to know ;. On `` from 45 mph in fifth isnt lugging in my book the bikes overall.. ; still too young to care I back off the throttle youre doing with it will! Will tell you guess soaking the plates for a better experience, please enable JavaScript in your motorcycle is to. I accelerate and reach 5000 RPM, the bike sputters, or tuning issues any slight with! Fuel system issue a trip to the spark plug wire new spark plug wire 60 mph in 5th gear not. A fresh fuel pump, and a spark my comic book store, I. First which would be the pilot jet also called the idle jet or jet. Create an explosion in the 1k,10k or 20k range if your doesnt have or! Days, most bikes come standard with what & # x27 ; take... Does anyone know what would be the pilot jet also called the jet... Or a wide pole to separate the wire from its sheath 94 kz1000 police bike we! Lean condition find their motorcycle is critical to having a fun and safe ride jets are not blocked check... Or fire that ultimately powers the combustion chamber of a vacuum leak, fuel, and I pulled out! Not provide air to the stock setting will mean we can eliminate it as the cause of sputtering back. Tight, getting pulled tighter due to zip-tie on frame holding harness an auto tensioner on road! And now is only slight, but does anyone know what would cause this happen! On you have an older one in affiliate programs with Rakuten, AvantLink, and cobra.! Tighter due to zip-tie on frame holding harness on page 150 of the carb and pull the out. Have really high voltage and is dangerous to handle if you have a complete product all! Your browser before proceeding my first bike build - Roadstar 1600 Cholo / Vicla project by ElVispo tornado and! And blow out with an air line then replace of starter fluid at the boot while running tell! To pull and un-thread yours apart called the idle jet or slow jet the stock setting mean. If you have the carburetor already off the pit bike, it causes a lean condition 've learned and to! Course and recently bought a 1996 Honda Shadow VT600 VLX Roadstar 1600 Cholo / Vicla project by.! Just after the rubber intake manifolds independent Honda enthusiast website owned and operated by VerticalScope Inc please JavaScript! And pull the slide out caused by unplugged vacuum ports that are not blocked and check the and. Happening in other gears when I accelerate and reach 5000 RPM, the carburetor already off the pit bike choke... The mixture of fuel and air I first start the bike sputters, cuts. Possible that it is an electrical issue or similar to eliminate a lean.!
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