Top End Kit w/ Cylinder for Yamaha Kodiak 400 1993-99 Big Bear 400 2000-12 ATV

Top End Kit with Cylinder for Yamaha Kodiak 400 and Big Bear 400

This top end kit with cylinder for Yamaha ATV engines rebuilds the upper half of the motor, pairing a fresh cylinder with a matching piston and gasket set so compression and power come back to spec.

Overview

This top end kit with cylinder for Yamaha ATV models delivers the core upper-engine parts needed to refresh a worn or scored cylinder bore. The kit suits riders and shops rebuilding Kodiak 400 and Big Bear 400 machines that have lost compression or started burning oil. As a complete top end rebuild solution, it keeps the cylinder, piston, and gaskets matched as one assembly rather than sourced piece by piece.

Built For Performance

• Complete top end kit combining cylinder, piston, and gasket set in one package
• Cylinder bore sized for the 400cc class Yamaha ATV engine platform
• Piston matched to the cylinder for consistent compression and ring seal
• Gasket set included to seal the cylinder base, head, and related top end joints
• Direct replacement fit for the factory upper-end layout on listed models
• Components chosen for trail, farm, and utility ATV duty cycles

Fits These Machines

• for Yamaha Kodiak 400 1993-1999
• for Yamaha Big Bear 400 2000-2012

On-The-Job Use

• Rebuilding a Kodiak 400 engine after low compression or excessive oil use
• Restoring a Big Bear 400 that has lost power on hills or under load
• Refreshing the top end during a planned engine service
• Replacing a scored or out-of-round cylinder on a high-hour ATV
• Utility and farm work where dependable low-end torque matters

Specs At A Glance

Good To Know

Q: Does this kit include everything needed for a top end rebuild? A: The kit bundles the cylinder, piston, and gasket set for the upper engine. Check the listing for any additional items such as rings or wrist pin clips before installing.

Q: Why confirm my ATV year and model before ordering? A: Kodiak 400 and Big Bear 400 models changed over the years, and cylinder and piston specs can differ by year. Match your machine's exact year and model to the listing to avoid fit issues.

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