All the motors I've seen that someone put a high comp kit in(not XT's) have been pretty happy with them, some have had heat issues( an added oil cooler will be helpful), several didn't last as long as the stock setup, BUT, with that extra power they also beat the motor pretty hard so that's a consideration. Mostly as long as you take care of it, don't run it at 7000rpm "because it sounds cool", and be vigilant with maintenance, it should work out good. I personally would go with something like 10:1 or maybe 10.5:1 and not have to worry about fuel quality/octane as much and make up for it by a good port job and valves. To get the most out of the piston a better set of carbs (CR33's work good I here) will be in order.
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