Namura Top End Repair for Yamaha 1996-2004 1200 PWC .020 Over Bore 84.5mm

Namura Top End Repair for Yamaha 1200 PWC .020 Over Bore 84.5mm

This top end repair kit supplies pistons, rings, wrist pins, and gaskets for rebuilding Yamaha 1200 PWC engines from 1996 to 2004 with a .020 over bore of 84.5mm.

Overview

The Namura top end repair for Yamaha 1200 PWC includes all essential components to restore engine compression and performance. Designed as a direct replacement for the worn top end, this .020 over bore kit with 84.5mm pistons allows for machining the cylinder to a clean, round bore. Suitable for DIY mechanics and professional technicians rebuilding a Yamaha 1200 PWC.

Built For Performance

• Includes piston rings, wrist pins, circlips, and complete gasket set
• Pistons feature a precision-machined skirt for reduced friction
• Ring end gap pre‑checked for consistent cylinder sealing
• Wrist pin bores hardened for long pin life
• Gaskets designed to match Yamaha 1200 PWC cooling and sealing requirements

Fits These Machines

• for Yamaha 1200 PWC (1996‑2004)

On‑The‑Job Use

• Engine top‑end rebuild after cylinder scoring or wear
• Restoring lost compression on high‑mileage Yamaha 1200 PWC
• Performance refresh when upgrading to larger bore pistons
• Marine engine overhaul for personal watercraft

Specs At A Glance

Good To Know

Q: Is cylinder honing required with this over‑bore kit? A: Yes, the cylinder must be bored and honed to 84.5mm by a qualified machine shop to ensure proper ring seating and piston clearance.

Q: Does this kit include the cylinder head gasket? A: Yes, a complete gasket set for the top end is included, covering base, head, and exhaust gaskets for a full rebuild.

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