GY6 150 Big Bore Kit????
 

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? :stupid: Any help will be greatly appreciated...

A good big valve head with bigger ports and stiffer valve springs will be a nice combo with a upgraded camshaft. You can also hand port the manifold a little bit. With the internal reverse you cant put a stroker crankshaft in but can bore it. Anything over 58.5 needs to be bored I believe there is a kit that's 61mm that's drop in but then the jug walls are supper thin your better off getting the case bored for a 61mm bore setup.

I went with the 58.5 as everyone said it was the safest and did not need additional machine work.

Good deal...thank yall

The big bore kit alone won't produce any more power. A performance head ported and polished correctly with a performance cam will wake that thing up.

Any suggestions for a good performance head and cam??

Give me a call 662-301-1563 and I can give you a few different options.

Sure will man, i will try to call you monday if that is ok for ya?

Talk to you on Monday.