Pistons Kit .010 over .25mm for Yamaha Wave Runner 500 1989-1993

.010" Over Pistons Kit for Yamaha Wave Runner 500

This .010" over pistons kit (.25mm) is a top-end rebuild set for Yamaha Wave Runner 500 watercraft, giving worn or scored engines a fresh bore size for renewed compression and power.

Overview

This pistons kit is built for the Yamaha Wave Runner 500 and supplies the oversized pistons needed when cylinders are honed or bored during a top-end rebuild. The .010" over size, equal to .25mm, restores proper piston-to-wall clearance on a worn engine. It is aimed at riders and mechanics bringing a 1989 through 1993 Wave Runner 500 back into service.

Built For Performance

• .010" (.25mm) oversize pistons for rebored or honed cylinders
• Designed to restore compression on worn Wave Runner 500 top ends
• Oversize sizing corrects cylinder wear from hours of use
• Suits a complete top-end rebuild when stock pistons no longer seal
• Direct fitment for the Yamaha Wave Runner 500 platform

Fits These Machines

• for Yamaha Wave Runner 500, 1989-1993

On-The-Job Use

• Top-end rebuilds after cylinder scoring or compression loss
• Boring or honing service on a worn 500 engine
• Restoring a classic Wave Runner 500 for recreational riding

Specs At A Glance

Good To Know

Q: Do I need to machine my cylinders for these pistons? A: Yes, .010" over pistons require the cylinders to be bored or honed to match the oversize, so measure clearance before assembly.

Q: Is this kit for one piston or the full engine? A: Confirm the quantity listed in the title against your engine's cylinder count, since some listings cover a single piston and others a complete set.

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