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Message: [QUOTE="marky522, post: 627096, member: 44523"] [i] I'll expand on this, It has good compression, it just isnt able to compress because i believe there is something wrong with the exhaust valve, the bike ran till end of last summer, my friend was riding it down the road and it died, he kicks it over and it kicks real easy, he assumes he blew the rings, i bought it wit hteh intention of replacing rings and was told to look further cause there were other possibilites, i start playing with it today and relize if i cover the exhaust port on the head while kicking it over i have compression. What causes a valve on a bike to just go bad? I pulled the top cover off the engine, the one that goes over the valve train assy, then rolled the engine over and everything is working as it should, i did see a adjust ment that would affect the seating of a valve but wanted to get some advice on what i was doing first. Thanks for any help, MArk[/i] [/QUOTE]