For a  YAMAHA YZ125 2002-2004

Wiseco Piston Part # (797M05600) 56MM 2MM OVER BORE

 Pro-lite pistons feature new forging design for maximum heat transfer. ARMOR-GLIDE COATING, Computer engineered piston skirt profiles stabilize the piston in the cylinder bore providing minimal cylinder wall friction with peak horsepower and maximum torque. All new ring land diameters combined with anti-detonation grooves create a turbulent flow of combustible gases sealing tht compression ring to the cylinder wall eliminating ring blowby and maximizing your engine's performance and power.