Special Notes:Notes for Kit: Primary Drive Steel Kit & Gold X-Ring ChainTo use an O-Ring or X-Ring chain on the Honda CRF450R you must have this part #1006590001. It is a counter shaft spacer. -All match original equipment exactly for perfect fit and size. -The ORH Gold X-Ring chain is Primary Drives best off-road chain for performance and durability. Features gold plating on the plates. -X-Ring shape provides an outstanding seal with reduced friction. -Average tensile strength 8,120 lbs. -Kit includes countershaft spacer.