High Idle When Bike is Hot

Discussion in 'Motorized Bicycle Trouble Shooting' started by Trevor, Aug 12, 2016.

  1. Trevor

    Trevor New Member

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    My bike runs fine and has good power for about 10 minutes but then when I start climbing hills or riding for a long amount of time it starts to lose a lot of power and I have to start pedaling with the motor. When I stop and let it idle it'll start to rev up high but the revs rise and fall a little. Then when I try and hit the kill switch it starts dieseling and refuses to shut off. I've tried adjusting the c-clip in the carb all the way up and down but it still does it.
     
  2. crassius

    crassius Well-Known Member

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    sounds lean - may be foaming fuel a bit and pulling air bubbles from too much vibration, or may get an air leak when something expands as it gets hot
     
  3. Tyler6357

    Tyler6357 Well-Known Member

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    Sounds like an air leak. When it gets hot the metal expands and I suspect that you have an air leak that causes loss of compression. Start it up and get it hot and feel around the head for any air shooting out around the head gasket. Check for leaks around the intake manifold and where the carb connects to the intake.
     
  4. Saddletramp1200

    Saddletramp1200 Custom MB Buiilder

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    What Tyler said. get a spray bottle & spray around the carb & intake with water. If it starts to choke you have found the leak. It would run rough & spit if the head is loose. It is a common problem on 2 strokes. And leak oil there.
     

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