BIG BORE GASKETS (TOP END)

Oversized (Big Bore) Top End Gasket Kits available for your MX Rebuild. A big-bore engine (one with a larger cylinder diameter relative to its stroke) is designed primarily for higher horsepower and quicker acceleration at high RPMs. By increasing the bore, you increase the surf...  show more

Oversized (Big Bore) Top End Gasket Kits available for your MX Rebuild.

A big-bore engine (one with a larger cylinder diameter relative to its stroke) is designed primarily for higher horsepower and quicker acceleration at high RPMs. By increasing the bore, you increase the surface area for combustion pressure to act on, allowing for greater power output