YZ450f +23 500cc Big Bore with Head Porting and +1mm Valve Package

This is a complete kit for the +23 Yamaha YZ450f engine which includes our Geisick Performance 102mm big bore cylinder kit (comes with brand new 102mm cylinder, piston and gaskets) Geisick Performance +1mm Ti valves, +1mm valve job, and head porting on customers head.

This is the ultimate high performance power package to build a fire breathing YZ450f. This package works extremely well for snowbikes and outlaw carts looking for the maximum power output.