4 stroking at higher rpm

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TheSignGuy

Member
Nov 24, 2014
459
9
18
seattle, wa
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
 

Greg58

Well-Known Member
May 1, 2011
5,353
2,575
113
65
Newnan,Georgia
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.
 

TheSignGuy

Member
Nov 24, 2014
459
9
18
seattle, wa
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.
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.