These pistons have been designed to incorporate a domed piston deck, resulting in a high compression profile and offsetting any change in volume caused by valve dishes. While maintaining compression through piston shape, we*ve minimized moving mass in our stainless steel valvetrain conversion by lightening our steel valves. The conversion to Black Diamond* Stainless Steel Valves offers up to double the life over stock Titanium valves without a loss in performance.
Features:

• Designed specifically for the performance demands of popular racing MX Bikes and Quads
• Pistons designed to maintain the stock compression after the effects of the dished stainless valves
• 2618 Alloy Fully CNC Machined Piston with performance skirt coating
• Black Diamond* Stainless Steel conversion system significantly increases valve durability
• Lightweight Racing Spring Kit compatible with high performance cams
• All of the gaskets, rings, pins and seals required for a top end rebuild
• Includes Piston, Rings, Clips and Pin
• Includes Top End Gasket Kit by Cometic
• Includes KPMI? S.S. Black Diamond* Valves, Stock Head Dia.
• Includes Dual Spring Titanium Retainer Spring Kit, Which Allows for 0.440* In. and Ex. Valve Lift

Fitment
Yamaha YFZ450 2004
Yamaha YFZ450 2005
Yamaha YFZ450 2006
Yamaha YFZ450 2007
Yamaha YFZ450 2008
Yamaha YFZ450 2009