The Sparks Racing 480cc Big Bore Cylinder Kit is the most cost effective way to get more power out of your YFZ engine. With the rising cost of OE pistons and cylinders, you can upgrade to this kit for few more dollars, and get substantially more power than stock. The enlarged aftermarket cylinder is designed to alleviate all the common problem associated with boring and re-plating the stock cylinder.
Each kit includes:
98mm Cylinder
98mm 12:1 Piston Kit
Head gasket and base gasket
Application: 98mm Pump Gas Big Bore Kit, Yamaha 2004-> YFZ 450
