Namura .020 Over Top End Kit for Yamaha Big Bear 400 & 1993-1999 Kodiak 83.5mm

.020 Over Top End Kit for Yamaha

This .020 over top end kit rebuilds the cylinder and piston assembly for Yamaha Big Bear 400 and Kodiak ATVs, featuring an 83.5mm oversize piston to restore compression and power.

Overview

This .020 over top end kit is designed for Yamaha Big Bear 400 and 1993-1999 Kodiak ATVs. It includes a piston, rings, pin, and gaskets to refresh the upper engine. The top end kit restores lost compression and extends engine life.

Built For Performance

• .020 oversize bore increases engine displacement
• 83.5mm piston provides precise fit and sealing
• Includes complete gasket set for a reliable rebuild
• High-strength piston rings ensure proper compression
• Durable piston pin withstands high loads

Fits These Machines

• for Yamaha Big Bear 400
• for Yamaha Kodiak (1993-1999)

On-The-Job Use

• Restoring engine power on trail-riding ATVs
• Rebuilding top end during engine overhaul
• Improving performance on farm and utility vehicles

Specs At A Glance

Good To Know

Q: Will this kit fit my Yamaha Big Bear 400? A: Yes, it is specifically designed for the Big Bear 400 and Kodiak models listed. Confirm your engine bore size before ordering.

Q: Is a full gasket set included? A: Yes, the top end kit includes the necessary gaskets for installation, ensuring a complete rebuild.

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