Top End Piston Kit - 47.45 mm - Yamaha YZ85
The piston is heat treated with a T-5 hardening and tempering cycle
The 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
Top end kit includes piston, rings, pins, circlips, top end gaskets, and wrist pin bearing