Piston Kit 73.00mm .040 in for Yamaha Wave Runner 500 1989-1991 1993

Piston Kit for Yamaha Wave Runner 500

This .040" oversize piston kit (73.00mm) is a replacement piston assembly for Yamaha Wave Runner 500 watercraft, built to restore compression and top-end performance on worn or rebuilt engines.

Overview

This .040" piston kit for Yamaha Wave Runner 500 models delivers the oversized bore fit needed after cylinder wear or honing. Each kit is intended for riders and mechanics rebuilding a 500cc Wave Runner powerplant. A 73.00mm piston kit keeps a personal watercraft on the water with fresh compression and reliable ring seal.

Built For Performance

• .040" oversize bore for refreshed cylinder walls
• 73.00mm piston diameter for correct fitment
• Ring kit matched to the oversized piston
• Piston pin and circlips included for assembly
• Built to withstand sustained marine engine heat

Fits These Machines

• for Yamaha Wave Runner 500, 1989-1991
• for Yamaha Wave Runner 500, 1993

On-The-Job Use

• Top-end rebuild on a worn 500cc engine
• Cylinder rebore and hone projects
• Restoring lost compression in a personal watercraft
• Preventive replacement during engine refresh

Specs At A Glance

Good To Know

Q: Do I need to machine my cylinder for this piston? A: Yes, a .040" oversize piston requires the cylinder to be bored and honed to the matching 73.00mm clearance.

Q: Can I install this piston kit myself? A: Installation is possible with the right tools and a service manual, though precision measuring of piston-to-cylinder clearance is essential for a reliable result.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.