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.

Regular Kit Includes:

• 98mm Cylinder

• 98mm 12:1 Piston Kit

• Head gasket and base gasket

High Compression Kit Includes:

• 98mm Cylinder

• 98mm 13.8:1 Piston Kit

• Head gasket and base gasket

***This high comp kit will work on all model years of the YFZ 450, but to run this kit on the 2004-2005 YFZ, you must use a 2006- newer crankshaft***