108 big bore for ATC90

[Bigsxy77]

I have a '78 ish atc 90 that I would like to bore out to 108cc. The kit that i found includes the piston, wrist pin and rings. Is there any thing else that I need? Rod? Head? Or anything else?

[motoman1012002]

just a top end gasket kit and sounds like your set

[Bigsxy77]

Thankx and wat do I have to bore the cylinder to?

[motoman1012002]

take it to the machine shop and they will measure the piston and bore from there

[swifty]

if your not adding a bigger carb cam and aftermarket exhaust the big bore will make almost no diffrence alone

[Bigsxy77]

110 carb? What would you suggest for carb, cam, and exhaust

[Xpress]

I have heard good things about Mikuni VM carbs. Might want to try a VM22, and then an exhaust like a Supertrapp or something.