Carrillo connecting rod for 2003 - 2009 Yamaha YZ450F For use ONLY with matching CP Project X Platinum series piston. WILL NOT WORK WITH STOCK SPEC PISTONS! Rod is 2.5mm longer than stock. Carrillo rods are far stronger than OEM stock conrods. These rods can be used as a direct replacement for the stock rods and offer improved performance in addition to much greater strength and durability.