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Message: [QUOTE="danjerman, post: 566242, member: 19517"] I have been trying to find out what make my piston was for some time, and now that I know, it's brought on a whole other slew of questions. Just today I found out what make my piston was for those of you following the thread in the Maintinence forum, it's a Wiseco. I was told you can tell by the "W" stamp in the underside of the piston. Anyways, after I found this out, I called wiseco to order some new rings and circlips to complete the top end. They had a little trouble finding the correct size rings for that piston, because according to them they didn't make a 73.95 MM piston for a 91' KX250. Finally after being redirected to LA Sleeve, I asked them if they made an overbore for a 91' KX250, no such luck. But they did find the piston I have, turns out its for a KXT250, a q-u-a-d made in the mid to late 80's! Now I haven't had this bike for too long, so this is very suprising to me to find out that I had a 300cc Monster this whole time, especially since the piston is for a KXT250! How could someone figure out this piston could work in this cylinder, especialy this big of a piston? Also, since no other mfg to my knowledge makes pistons this big for my dirt bike, is it safe to have this big piston in there? I haven't had any problems so far after about 45 hours of slow riding on the top end, should I expect any? Thanks [/QUOTE]