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Message: [QUOTE="Canadian Dave, post: 257553, member: 16102"] " To the point where the ring will not fit in the top groove the whole way like it does the bottom" Sounds to me like the piston ring groove is unevenly worn. If the ring doesn't fit perfectly parallel in the ring groove you need to replace the piston. If the top end is 8 years old I'd certainly treat it to a new piston and rings. You should inspect the crank assm. and crank seals while you're at it. 8 years without top end maintenance is a long time. I think if you check out [URL=http://www.eric-gorr.com/techarticles/twotopweb.html]this[/URL] the rest of you questions will be answered. David [/QUOTE]