Just got a 200cc Yamoto today... assembled, tuned it up, and took it out.

One question... while riding, occassionally there is a high pitched metal clinging sound... very fast repetition; almost like a loud high pitched buzzing sound... has anyone had the problem before? Could it be the piston hitting the plug???

 

BUMP

 

If it was the piston hitting the plug, the atv would loose power and stop running pretty quickly. Most likely you have a loose part somewhere that is resonating at a specific rpm. Try looking for loose bolts and see if that clears the noise up.

 

Thanks for the response.... I figured that much, but I just wanted to make sure with these Chinese quads...

Thanks again!