Piston Crf250R 270 Bb B 23653BPiston Kit Forged Big Bore for 4 StrokeThe 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 Increases engine's displacement, torque and peak horsepower Forged OE stock compression big bore piston Piston kit includes piston, rings, wrist pin and circlips Kit Includes: Piston Ring Set Wrist Pin Circlips