Piston Kit | 04-22 Yamaha YFZ450/R
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All pistons are heat-treated with a T-5 hardening and tempering cycle. All pistons skirts are coated with a hi-tech molybdenum bisulphite coating for faster break-in time and increased piston life. Standard pistons and rings are O.E.M. replacements.. Kits include piston, rings, wrist pin and circlips. 2-Stroke piston kits are gravity cast aluminum alloy (not forged) with 18% silicone content, which produces an extremely light, but very strong, piston. 4-Stroke pistons are forged from 2618 aluminum for superior strength and durability. 4-Stroke high-compression pistons improve power and torque across entire RPM range. 4-Stroke big bore pistons increase engine's displacement, torque and peak horsepower.