VERTEX Piston Kit - 66.35 mm - Yamaha YZ250/X 22584B

Piston Kit - 66.35 mm - Yamaha YZ250/X
Piston is heat treated with a T-5 hardening and tempering cycle, Piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life, Gravity-cast aluminum alloy (not forged) with 18% silicone content, Cast OE replacement piston, Kit includes piston, rings, wrist pin and circlips