Hey Guys, working on a trail master buggy with the GY6 150, and it has the internal reverse...I'm having to replace the piston and rings, so I thought while I'm doing that might as well put a big bore kit on this bad boy... What name brand do I need to look for, and what size can I get away with, without having to bore my case out?? Found a site that says a 58.5 is the largest you can go without boring ur case, but another site is saying you can put a 61mm on without boring ur case? I don't know? Any other ideas like a different crank, cam, should I have the heads ported? Probally a good idea to replace my timing chain too huh?
Any help will be greatly appreciated...