SBT Yamaha jet ski pistons are high quality, high strength, cast eutectic pistons. Our "1MM Over" pistons are comparable to others premium pistons - anodized on the top surface for better heat resistance and surface strength, graphite coated on the sides to reduce friction between the piston and cylinder and enable efficient break in. SBT is so confident in the quality of our pistons that all pistons come with a LIFETIME warranty against manufacturers defect!The Yamaha 500 Piston Kit comes with our piston, complete set of steel rings, cir-clips, and piston pin - everything you need for swapping out a piston in your engine.This is 1MM Over bore from Stock 73MM SizeApplications:1989 Yamaha1989 Yamaha Wave Jammer 5001989 Yamaha Wave Runner 5001990 Yamaha1990 Yamaha Wave Jammer 5001990 Yamaha Wave Runner 5001991 Yamaha1991 Yamaha Wave Runner 5001992 Yamaha1992 Yamaha Wave Runner 5001993 Yamaha1993 Yamaha Wave Runner 500
