Anybody have any experience with rebuilding a top end on a pw50? I put a wiseco top end kit in my sons bike and it seemed really noisy when I put it back together. Took it back apart three times and everything looked fine. No scratches or anything. Used 2 stroke oil to lube it when I put it together (each time). The crank doesnt have any play and moves smooth. Any ideas? It seems to have way more compression now,( judging by my foot.) Thanks for any input.