4 stroking at high revs

[fellafoe]

can a air leak cause this at high revs?

 

[Cabinfever1977]

i dont know,but you should check your bike for airleaks and seal them with gasket maker.

 

[Goat Herder]

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.

 

[Bikeguy Joe]

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]

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

 

[Bikeguy Joe]

I learned the two cycle/four cycle thing from model airplanes.

 

[mark880088]

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.

Where does one get different sized jets?

 

[Bikeguy Joe]

You can solder it closed then re-drill it... I would try the C clip first.