4 stroking at high revs

GoldenMotor.com

Goat Herder

Gutter Rider
Apr 28, 2008
6,237
20
38
N.M.
lightly spray mist carb cleaner around the engine if the idle goes different anywhere than directly at the carb thats an air leak. A better exhaust pipe is what I think makes these motors go better. Along with port matching. Check your plug Its needs to be a chocolate brown or slightly golden . I go for the darker side don not like suprizes. If you are just running a new engine meaning not broke in go 16 to one for break in then 20-24 to one after it takes about 3 to 4 tanks burned before break in You will feel a slite bit more power after break-in.
 
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Bikeguy Joe

Godfather of Motorized Bicycles
Jan 8, 2008
11,837
252
63
up north now
Four stroking is caused by an overly rich mixture. Move your needle clip up a notch and it should be better. You could also have too large of a jet.
 

NEAT TIMES

New Member
May 28, 2008
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PENSACOLA, FL
Good Morning Joe. That Is What I Think Also. When Adjusting Chain Saws, I Run It Full Throttle And Open The High Speed Needle Till It 4 Cycles And Then Turn It In Till It Sounds Rite. That Way You Avoid A Lean Situation. Ron