Head and Piston advice for the 80cc Oct 23, 2016 18:38:41 GMT -5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by phatmanxxl on Oct 23, 2016 18:38:41 GMT -5 No blow back, thank god. I'm gonna get a better head gasket set and keep scrubbing the crap off the valves. That was probably the problem.