Namura Top End Repair for Yamaha 1998-2005 800 PWC .020 Over Bore 80.5mm

Top End Repair for Namura

This top end repair kit is designed for Yamaha 800 PWC models from 1998-2005, featuring a .020 over bore and 80.5mm diameter. It includes a piston, rings, and gasket set to restore engine compression and performance. Designed for rebuilding personal watercraft engines, this top end repair ensures a precise fit.

Overview

The top end repair kit for Yamaha 800 PWC is a complete solution for refreshing worn cylinders. It provides .020 over bore sizing and 80.5mm piston diameter to match a variety of rebuild requirements. This top end repair kit is ideal for DIY mechanics and marine enthusiasts looking to extend engine life.

Built For Performance

• .020 over bore provides a fresh sealing surface
• 80.5mm piston manufactured to tight tolerances
• Includes premium rings for optimal compression
• Complete gasket set prevents leaks
• Directly replaces worn top end components

Fits These Machines

• for Yamaha 800 PWC (1998-2005)

On-The-Job Use

• Rebuilding Yamaha WaveRunner and other 800 PWC engines
• Restoring compression after high hours or wear
• Performing a top end overhaul in marine repair shops
• Installing an oversized piston for increased displacement

Specs At A Glance

Good To Know

Q: Is the piston cast or forged? A: This top end repair kit uses a high-quality cast piston with durable rings for reliable performance.

Q: Do I need to bore the cylinder to .020 over? A: Yes, the kit is meant for a cylinder that has been bored .020 oversize; professional machining is recommended.

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