That sounds like good information however I do it differently. If it's a 30cc I check to be sure that the piston ring pins are on either side of the intake port between the transfer passages. The 25cc without pins I put together the same way even though I know that the ring is capable of turning freely. It just seems like a good place to start. As far as the needle bearings go, I have found them to be either way. Any way that's another two cents worth..........