4 stroking and studdering

Frohawk337

New Member
Aug 8, 2018
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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

Well-Known Member
Mar 15, 2012
1,115
162
63
Santa Barbara, CA
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

Well-Known Member
Sep 30, 2012
4,032
154
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USA
agree, try the clip first then wait for it to break in before trying a jet (these go leaner as they run in)