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Message: [QUOTE="ThumperPower, post: 271016, member: 23185"] Sounds like a stuck open valve. He has torn it down 5 times and found nothing? even with the motor out of time he will have compression. There is no decompresion release on this bike if i recall. If there were i would suspect that to be the problem. But anyway i would say his problem is in the head somewhere, all it takes is a small leak. Seeing as he put a new piston and rings in it, did he have the valves recut, or replaced? These are just some thoughts, but i would look at the head to start. [/QUOTE]