All Balls Racing Group is pleased to offer the new YZ250 Big Bore Cylinder Kit from Cylinder Works. This Kit increases displacement on your bike with top-quality parts all in one package. Sized to fit your stock engine without machine work or modification, our big bore cylinders are aluminum cast with a nickel silicon carbide cylinder sleeve. And, to reduce the guesswork, time, and overall costs our kits include the correctly sized piston, rings, wristpin, power valves and gaskets.
