Engine running slower when warmed up

seanbbolson7878

New Member
Aug 21, 2019
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I have a China girl 80cc and had lots of issues with it 4 stroking. I went ahead and bought a bike berry HP carb and it runs way better but there is still some 4 stroking at WOT. It runs almost perfect around 1/2 - 3/4 throttle then 4 strokes. I have sealed all of the gaskets with some more high temp gasket maker so I know it's not an air leak. Also the bike seems to run a little slower when its warmed up compared if I ride it when its warming up. Running 24:1 and have probably ran 1 tank of gas through it. Maybe it's just 4 stroking during the break in period?
 

Greg58

Well-Known Member
May 1, 2011
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Newnan,Georgia U.S.A.
I would run a least another tank of fuel then go to 32/1 and then work on jetting. It sounds like the jet is too big, at wide open the needle is completely out off the jet so good mid range makes sense.