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i have bored out .25 over and i dont know if it was the clutch kit of the engin but i could pull the front tires off the ground when i bored it and put a clutch kit in it, the most u can go is 1.00m it goes like this ( .25, .50, .75, and then 1.00 over and that is what i am waiting on from honda a 1.00 piston it should be here tuesday. and i will let yall know how it does!!
ooohh and i dont really makes that much in a cc change and not much horsepower i think mabey like 1-2 more hp but u got to think that these bikes only have like 16hp stock but im not very sure on the hp!