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Message: [QUOTE="Maverik, post: 885318, member: 59279"] You wouldnt notice the piston slap noise at higher RPMS, it would blend with all the other noise. At least thats been my experience. I had a 91 KX 250 that slapped, it wasnt bad but i knew it would need some attention in the near future. As far as seeing the marks, check around the exhaust ports in the front of the cylinder and on the front and back side towards the bottom of the piston, Im sure there are normal wear marks in those 2 areas. Mic front to back where the wear marks are, then mic front to back a little further up the piston, those 2 measurements should be pretty close. You really wouldnt see any distinctive slap marks, since the piston is in motion it would just slide. You would only hear that initial contact. I know what you mean about saving a few bucks where you can, Im with ya on that, just not on a select few parts. Im merely speaking from experience, so please dont take my word as the gospel. IM sure there are peeps on this forum that have much more knowledge that I do about this issue. I just wanted to chime in and try to help and share some experience. I didnt think about it before, but is there some sort of timing positioning on the older KIPS powervalve? This could also be an issue. [/QUOTE]