YF200 R1 - Yamaha YF200 R1 Engine Kit (Unassembled). The Yamaha YF200 R1 kit comes with a billet connecting rod, ARC billet aluminum adjustable flywheel, stainless steel valves, XR extreme duty valve springs, tubular chromolly push rods, forged aluminum piston, Tillotson carburettor, forged crankshaft, K & N filter & pre-filter and Cometic gaskets which incorporate the latest in racing technology. (Shown with Header and Chain Guard - Not Included)