4 stroking at higher rpm

Discussion in 'Motorized Bicycle General Discussion' started by TheSignGuy, Jun 8, 2018.

  1. TheSignGuy

    TheSignGuy Member

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    Hey my bike 4 strokes a tiny bit at 60-65 kmh I use stock CDI and exhaust..


    What is the issue?

    I broke 40+ mph enough to make the speeds not keep up
     
  2. Greg58

    Greg58 Well-Known Member

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    Sounds like the main jet is too large, the needle is drawn out of the jet above 3/4 throttle resulting in maximum fuel flow.
     
  3. TheSignGuy

    TheSignGuy Member

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    Logical but here's the thing I don't think it's 4ting I think it's like detonating at higher speeds cause it's like a knawing like sound more associated with knock, cause at 50kmh it makes no sound like either I'm not disposing of some of the exhaust completely BTW I am running Lucas at about 30-32:1 a little below 8 oz per 2 gallons by 0.3 oz short of 8 oz.
     

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