4 stroking and studdering

[Frohawk337]

Ok so I bought a tdpro I think it's the standard Chinese 80cc 2 stroke when I'm riding it after I get over 1/2 throttle or so and I am at cruising speed with really no drag on the motor it starts shuddering and 4stroking it is still all stock except I put a banana exhaust on it any help would be great thanks in advance

 

[Tyler6357]

Welcome!
If it's 4 stroking that usually means that you are running too rich. Often times the 4 stroking will stop after the engine has been broken in. Put the clip on the leanest setting. If it doesn't go away you will probably need to go with a smaller carb jet.

 

[crassius]

agree, try the clip first then wait for it to break in before trying a jet (these go leaner as they run in)