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Message: [QUOTE="BigRedAF, post: 1261192, member: 58172"] I'm pretty sure that a backwards piston on a 465 would hang a ring in that huge exaust port... If you have little or no compression and your using a stock cast piston I would think that a holed piston isn't out of the question. Those bikes pinged as deliver from Yamaha. Combine that with questionable jetting and deep sand riding and you have a recipe for trouble. It's easy to pull the head off that bike so take a look and see whats up. I had a 1980 YZ250G, great bike. Your 1981 has the same look, I hope you get it going soon. [/QUOTE]