99-13 YZ250 SINGLE RING PISTON 66.40

Endurance and high rpm Kit includes piston, ring(s), wrist pin and circlips Engineered, forged, and machined in the USA GP Series parts generally have less machining on the outside, which helps seal up the bore for increased compression Each piston is electra-coated on the dome, ring groove, and pin bore, for maximum wear resistance and protection from micro-welding, galling and detonation ArmorGlide® skirt coating reduces friction and noise for more horsepower potential