The Sparks Racing 480cc High Compression Big Bore Cylinder Kit is the perfect add-on for anyone looking to maximize the performance of their YFZ 450R/X engine. This kit is a simple bolt-on option for anyone looking to increase the performance of their YFZ-R/X while retaining durability. The enlarged aftermarket cylinder is designed to alleviate all the common problem associated with boring and re-plating the stock cylinder.

***Note: Anytime drastic changes in engine size are made on EFI bikes, revised tuning is required. We do offer fuel maps for the Dynatek Fusion and Dynojet Power Commander V, but you must have all the components we tune for in order for our maps to work

Each Kit Includes:

• 98mm Cylinder

• 98mm 13.8:1 Piston Kit

• Head gasket and base gasket