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YZ 465 loss of compression = death?
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[QUOTE="rmc_olderthandirt, post: 1260035, member: 68872"] Riding in soft sand can put a pretty big load on the engine. I would have advised breaking the engine in a little more gently. Did you check the end gap on the piston rings before you installed them? You do this by inserting the ring into the cylinder by itself and then using a feeler gauge to measure the gap. There needs to be some, and the proper amount would be found in the repair manual or perhaps in the papers that came with the new rings. If you didn't check the end gap then there is a high probability that it was too tight. My experience is that the rings are supplied a bit large so that you can make them fit: you can make a big ring smaller by filing the ends but you can't make a small ring bigger. Like the others said, it sounds like it siezed on you. I would say that it is about 50/50 if a "sieze" actually locks the piston. Half the time it just ruins the rings and you lose compression without it locking up. Take the head off, look inside. Rod [/QUOTE]
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YZ 465 loss of compression = death?
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