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Why is my pit bike running slow

Drives fine no splutter just slower than usual

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: not running smooth when damp

one day when i washed my bike, i had tha same problum. it took a while to figure out, and it ended up being water down in the spark plug holes. i took a shop vac to get the water out.then it was like new again.

Posted on May 04, 2009

wd4ity
  • 4565 Answers

SOURCE: hi mt pit bike is spluttering under acceleration i

Your bike may be jetted too lean. A common problem in these days of overzealous EPA regulations. You can tell if when you've cranked your throttle wide open and it splutters, if you back off on the throttle about 1/8 to 1/4 turn, it clears up. This is indicating that it is jetted too lean. When you close the throttle slightly, the fuel is being metered by the main jet and by backing off on the throttle a bit, you're cutting back on the air, thereby bringing the mixture closer to what the engine needs. Try rejetting the carb, Go up one or two sizes on the main jet, one step at the time.

Now, it could be too rich as well. If it splutters and blows black smoke out the exhaust, it either jetted too rich or the float level in the carb is set wrong.

Take care of the simple stuff first before rejetting the carb. Make sure your spark plugs are the correct ones and they are not fouled from overusage of the choke or enricher. If you allow the bike to "warm up" with the enricher on, plug fouling is common with this practice. I get the bike started and as soon as it will run without the enricher or choke on, I turn it off and keep the bike running with the throttle. Don't foul as many plugs that way.

Posted on Nov 10, 2009

  • 9 Answers

SOURCE: when ridden hard bike will splutter or miss but

Fuel supply running out. Usually clogged filter. that allows enough gas through to run at lower rpms but not at high demand. Could be filter in tank, there is a mesh screen on the inlet to the fuel petcock. You would have to have some serious issues with rust in the tank or a batch of extremely bad gas for this to happen. I would look to see if you have an inline filter, I have no knowledge of that particular bike.

Posted on Mar 07, 2010

  • 314 Answers

SOURCE: while accelerateing through 40-50 mph, the bike

Check spark plugs or carb jets .could be fuel or electrical problem

Posted on Mar 16, 2010

miket756
  • 2702 Answers

SOURCE: rrx model bike runs fine

sounds like the carb has blocked slow running jets in it

Posted on Aug 12, 2010

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1 Answer

163FML (CG200) bogging at low rev


Hi, Marcus and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on blue links below. Good luck and have a wonderful day.
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09 TM EN 300,after the bike is warm and ridden for around an hour or so,it splutters and misses under quarter throttle intermittantly..Clean carby jetted well..Electrical issue im thinking?Anyone...


Check the gap on the points and check to see if they're pitted or burnt. You might just need to clean them with some emery cloth or something similar. If they're pitted or burnt, they need to be replaced

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1 Answer

When ridden hard bike will splutter or miss but runs fine on low revs


Fuel supply running out. Usually clogged filter. that allows enough gas through to run at lower rpms but not at high demand. Could be filter in tank, there is a mesh screen on the inlet to the fuel petcock. You would have to have some serious issues with rust in the tank or a batch of extremely bad gas for this to happen. I would look to see if you have an inline filter, I have no knowledge of that particular bike.

Mar 07, 2010 | 2005 Triumph Speed triple

2 Answers

Hi mt pit bike is spluttering under acceleration i have tryed to adjust air screw with slight difference but it is still not smooth under power. bike is fk1 125 dont know if valve clearence would be the...


Your bike may be jetted too lean. A common problem in these days of overzealous EPA regulations. You can tell if when you've cranked your throttle wide open and it splutters, if you back off on the throttle about 1/8 to 1/4 turn, it clears up. This is indicating that it is jetted too lean. When you close the throttle slightly, the fuel is being metered by the main jet and by backing off on the throttle a bit, you're cutting back on the air, thereby bringing the mixture closer to what the engine needs. Try rejetting the carb, Go up one or two sizes on the main jet, one step at the time.

Now, it could be too rich as well. If it splutters and blows black smoke out the exhaust, it either jetted too rich or the float level in the carb is set wrong.

Take care of the simple stuff first before rejetting the carb. Make sure your spark plugs are the correct ones and they are not fouled from overusage of the choke or enricher. If you allow the bike to "warm up" with the enricher on, plug fouling is common with this practice. I get the bike started and as soon as it will run without the enricher or choke on, I turn it off and keep the bike running with the throttle. Don't foul as many plugs that way.

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I just got a 110 ssr pit bike. is the back brake


It should be below. Not to sound rude, but I think you could have figured this one out yourself. You sound like a smart guy.

Thanks for using FixYa.

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if you turn a motorbike tank into reserve..
the patrol wont go to a little filter.. soo.. thats the splutter and so..

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Black is usually a sign that the motor is running rich. A carb adjustment would be in order.

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check the 4 stroke oil if it starts to splutter at half throttle

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