talked to a buddie of mine that owns a chopper shop and he said that if you bore out the sleeve with out changing it, your gonna run into over heating problems. he would recommend just upgrading the pistion or put in a set of hot cams. he said those would be the best bang for the buck without any cooling issues.
i read the issue and they said they didnt have any problems with it over heating, but i live in LA the "capital of humidity" and i beat the crap out of my bike. how they tested their test bike, i dont know. but i'm pretty sure it wasnt how i drive mine, or at the same altitude, with the same humidity.
just food for thought !!!!