This kit is currently not available for purchase online. To order, please contact DRI at 619-258-6306 and speak with one of our sales representatives who will assist you by collecting the required specifications and placing your order. 

MODEL: '04-'09 Yamaha YFZ 450

CORES REQUIRED: None

OPTIONAL UPGRADES: Crankshaft Balance $275

DISPLACMENT: 500.8 cc (98x66.4 )

COMPRESSION: 13-1

KIT COMPONENTS: 98mm 13-1 Forged Piston kit, Headgasket, Nikasil Coated Big Bore Cylinder, 66.4 mm Stroker Crankshaft

NOTES: Kit bolts in, No machining required. Engine must be completly torn down and re-assembled by a trained competent mechanic. DRI will install kit in your engine for $595.00 + kit and any additional parts (gaskets, seals etc)
CAUTION; 2004-05 Model YFZ must install an upgraded oiler kit (price $429) see link for more details

*THIS KIT MAINTAINS THE USE OF NIKASIL COATING ON THE CYLINDER. **A STEEL BIG BORE SLEEVE IS NOT USED IN THIS KIT, ***NIKASIL COATED ALUMINUM CYLINDERS OFFER SUPERIOR PERFORMANCE AND RELIABILITY OVER CYLINDER WITH STEEL SLEEVES

ADDITIONAL PERFORMANCE RECOMENDATIONS:
THE FOLLOWING MODIFICATIONS ARE STRONGLY RECOMMENDED TO COMPLETE THE PERFORMANCE PACKAGE FOR YOUR ENGINE. Fat Boy 4 Complete Exhaust System HP4 Valve Train Kit Vortex X10 CDI