My 86 xt with 10000 miles showed about 170 lbs with a new compression tester. Manual says 128 minimum, 156 nominal, and 170 maximum. Your readings of 180 can be a gauge that is not calibrated exactly. There is NOTHING that will make too much compression so be happy it is a high reading and greater than nominal.
I have just rebuilt a top end on another bike with new rings and a honed cylinder. I am anxious to check it once the rings are seated, I have not checked it yet but have had it running.
Steve
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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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