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Message: [QUOTE="shockdoc, post: 272125, member: 23028"] Jer I know what your saying as I'm really not a fan of putting aftermarket pistons in. I would rather put bodies on these shocks but have had decent luck using a 8mm piston band piston. When I first started seeing this prob. ('99) it was on a KX 250. After several tear downs installing new piston rings, different oils and such would still start seizing after it started warming up. Leave it sit for 10 minutes and it frees up. Talked to Ross Enzo, Steve Sercy and tryed everything. I ordered a new shaft assy from Kaw & without grinding nut off installed it. Still same thing. Put a new body on & it worked great with (both) shafts. I might add...none of these shocks have shown any wear/scoring inside the body. I had several bodies checked with a digital bore guage by a very competent machinist here in Jax & according to him they were final honed wrong. You could see the shape of the body as it got smaller in the middle. No way it was worn that way he said. Then I started seeing Pro-Circuit shocks & FC shocks that customers had sent to them for same reasons. They all had 8mm piston ring pistons. I'm no big fan of PA as you might think but thats also what they were doing on shocks seizing up. I'm not using their piston anyway. As a matter of fact I just did another 00 KX250 tonight. Now I will tell you that I 100% don't know what is causing this but have seen approx 50 - 75 of these in the last cpl years which have been fixed this way. As much as you do I am surprised that you haven't come across this. I would also welcome any other ideas you might have as we can all always learn more. I still can't figure out why some shocks work for awhile before they have this problem and I've also seen a new 01YZ250 do this with less than an hour on it. The dealer ordered new body & fixed it. Like I said these might not be the answers but I do know what I've done & what has worked & what hasn't. I'm not closed mine & I'm open to suggestions. doc [/QUOTE]

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