I just bought my son a Tao 125cc that was already put together. It starts up great and ideals great but when you start riding and get to going faster the rpms get real high and vibrates like it needs to change gears and or blow the motor. My nephew has a different Chinese quad that’s a 125 cc and it doesn’t have the high rpm sound and sounds normal. My daughter has a 135 taotao that’s older and it sounds good as well. Has anyone ran into this before ? Thanks for the help

 

Did you ever find a solution to this? My daughter's brand new atv is doing the same thing.