Namura .020 Over Bore Top End Kit for Yamaha Kodiak & Grizzly 400 2000-2008 85mm

Namura .020 Over Bore Top End Kit for Yamaha Kodiak & Grizzly 400

This Namura .020 over bore top end kit includes a piston, rings, pin, and gaskets designed to restore compression and performance for Yamaha Kodiak and Grizzly 400 ATVs from 2000 to 2008 with an 85mm bore size.

Overview

The Namura .020 over bore top end kit is a direct replacement for worn-out top ends on Yamaha Kodiak and Grizzly 400 engines. It provides the necessary components to rebuild the cylinder with a .020 oversize piston, ensuring a tight seal and renewed power output. This kit is ideal for riders and mechanics performing an engine rebuild on these popular ATV models.

Built For Performance

• Precision-machined piston with .020 over bore for accurate fit
• High-strength rings for optimal compression and oil control
• Includes wrist pin and circlips for secure assembly
• Complete gasket set for a reliable seal during installation
• Designed to match OEM specifications for Yamaha 400 engines

Fits These Machines

• for Yamaha Kodiak 400 (2000-2008)
• for Yamaha Grizzly 400 (2000-2008)

On-The-Job Use

• Trail riding and off-road adventures requiring dependable engine performance
• Utility work such as hauling or plowing where low-end torque is essential
• Engine rebuilds during routine maintenance or after top-end failure
• Restoring an older ATV to like-new condition

Specs At A Glance

Good To Know

Q: Is this kit compatible with stock cylinder? A: Yes, this .020 over bore kit is designed for cylinders that have been bored to 85mm to accept the oversized piston. Your cylinder must be machined to the correct dimension before installation.

Q: Do I need any additional parts for the rebuild? A: You may need a new cylinder if the original is damaged beyond boring, as well as fresh engine oil and coolant. Always inspect the cylinder bore before ordering the oversized piston.

Slight variation in finish or dimensions may occur between production runs, and confirm compatibility before ordering.