YFZ 450 and YFZR 450 Engine Kits
- 500cc Engine Kit - 100mm Cylinder Kit and 14:1 Piston, Head Studs, Head Porting w/+1mm Valves, HD Valve Springs, Web Cams, Top and Bottom Gasket Kits
- 525cc Engine Kit (Carb Model Only) - 100mm Cylinder Kit and 14:1 Piston, Head Studs, Head Porting w/+1mm Valves, HD Valve Springs, Web Cams, +3mm stroker Crank Trued/Welded, Top and Bottom Gasket Kits
- 540cc Engine Kit - 100mm Cylinder Kit and 14:1 Piston, Head Studs, Head Porting w/+1mm Valves, HD Valve Springs, Web Cams, +5mm Custom Stroker Crank, Top and Bottom Gasket Kits (carb models require a cylinder spacer, long cam chain, and oil line spacers)
