So I got a china girl and I "upgraded"from 47mm piston to a 49mm "big bore".

Over did it again

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Jun 5, 2021
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When the Piston travels all the way down to bottom dead center the intake is not completely closed off there is a little bit of Gap at the bottom. Is that okay or is it supposed to completely seal off
 

Greg58

Well-Known Member
May 1, 2011
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Newnan,Georgia U.S.A.
A picture would help, are you saying the piston skirt or window never is fully closed? If you are running reed valves it won't be a problem.