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Message: [QUOTE="Micahdawg, post: 885310, member: 21668"] I assume I would see piston slap as some scored markes on the cylinder and piston? When i got the bike, i wasn't sure it could be salvaged as it needed the cases split, new top end, subframe, fork rebuild, tires, bars, controls, seat, etc.... you get the picture. So a $16 good used piston definitely helped out in the rebuild. I typically wouldn't do this, but I got a lot of parts for very cheap and did all the work myself and still have almost $1400 in a friggen 89 KX. Once the bike was done I put about 15 hours on it before the KIPS subport valve broke. So I did a compression test before yanking the jug (it pulled 155) and decided that I would not be redoing the top end. The cylinder looked just as it did previously. Aside from some decent carbon build up on the piston dome it looked fine as well. Would piston slap be audible at all rpms or just low rpms? Micah [/QUOTE]