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Oh thanks, I didn't realize there was a new forum for non-china bikes. Cool.
Actually I did the rebuild. But I do admit this was my first one. I had a machine shop bore the cylinder 1mm over. I gave them the new piston so they could match it perfectly. I did it by the book and also had some help from an experienced guy too. The end gaps and position of the rings were perfectly in spec. I did wipe oil in the bored cylinder too. However, I didn't know that a new top end would cause hot running and poor fuel mileage though. 20 mpg's seems pretty bad to me. Do you think that's a little too low for a 600?
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