Only runs while i pedal

Discussion in 'Motorized Bicycle Trouble Shooting' started by Tucson_Toast, Jul 13, 2016.

  1. Tucson_Toast

    Tucson_Toast New Member

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    I have an 80cc grubee that i just replaced the piston on and it will not stay running under its own power. If i pedal it for a while it turns over, even gets up to running temperature but will die as soon as i stop pedalilng. Stuck.
     
  2. crassius

    crassius Well-Known Member

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    I'd take out plug and see if it turns easily - sometimes thing drag if something is mismatched when replaced.

    if OK, then I'd check compression and gaskets and seals, then a way too lean fuel flow
     
  3. Kioshk

    Kioshk Active Member

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    New rings as well? I had a similar problem a while back. Turned out the rings were defective: they had a slight inward bevel that allowed expanding gas to pass over them. A used pair I had laying around completely resolved that heartache.
     
  4. Tucson_Toast

    Tucson_Toast New Member

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    Pulled the exhaust off and it came right to life. Wayy too rich air:fuel ratio
     

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