I have an 01 Blaster and need to get it bored. The only piston had busted and scratched my cylinder wall, not huge scars, just tiny scratches. I need to get a new piston kit for it, we measured it and it came up 66.7mm and we found 2 pistons. 1 being 66.00, the other being 65.5. Which would be best, bore it over, or just buying a new piston? If I should bore it, what size should I go, if I should buy a new piston, what size should I get? Sorry, not too smart with this stuff right now