For Yamaha ATV Big Bear 400 4x4 Cylinder Piston Gasket Top End Rebuild Kit 00-12

Top End Rebuild Kit for Yamaha Big Bear 400 4x4

This top end rebuild kit for Yamaha ATV Big Bear 400 4x4 models supplies a cylinder, piston, and gasket set so the upper engine can be rebuilt and returned to reliable running order.

Overview

This top end rebuild kit for Yamaha Big Bear 400 4x4 machines covers the parts that wear first in the upper engine. It pairs a replacement cylinder with a matching piston and gasket set so compression, ring seal, and oil control are restored in one job. Owners of 2000 through 2012 Big Bear 400 quads use this top end rebuild kit for Yamaha ATV service after power loss or oil burning.

Built For Performance

• Cylinder, piston, and gasket set bundled as one rebuild package
• Cylinder and piston matched for correct clearance and ring seal
• Gasket set seals the cylinder base, head, and top end joints
• Direct replacement layout for the factory 400cc Big Bear 4x4 engine
• Built to handle the load of a working utility ATV
• Keeps upper-end parts matched instead of sourcing them separately

Fits These Machines

• for Yamaha Big Bear 400 4x4 2000-2012

On-The-Job Use

• Rebuilding a 4x4 Big Bear 400 after compression loss
• Restoring power for plowing, hauling, and trail riding
• Fixing a machine that burns oil or smokes at startup
• Servicing the top end before a busy work season
• Replacing a scored cylinder on a high-hour ATV

Specs At A Glance

Good To Know

Q: Will this kit fit any year of Big Bear 400 4x4? A: The listing covers 2000 through 2012 Big Bear 400 4x4 models, but specs can vary by year. Verify your exact model year before ordering.

Q: What else might be needed during a top end rebuild? A: Along with this cylinder, piston, and gasket set, check the timing chain, valves, and wrist pin clips for wear. Replacing worn parts at the same time helps avoid a second teardown.

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