I am running a 15/45 on my 86. I replaced a 14/42 and chain with the larger sprockets. Stock is 15/42 on the 80's XT600. This is the perfect gearing for the mountains in Colorado. It is good for running around town too, not too good for long distances, but I don't do that anyway....
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'84 XT600 is now bored to 2nd oversize and new OEM pistons and rings installed. No more smoking.
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