Namura .020 Over Bore Top End Kit for Polaris Sportsman 850 Scrambler 850 87.5mm

Namura .020 Over Bore Top End Kit 87.5mm for Polaris

This top end kit delivers a precision .020 over bore piston and cylinder assembly for Polaris Sportsman 850 and Scrambler 850 engines.

Overview

The Namura .020 over bore top end kit provides a direct replacement cylinder and piston set designed to restore power and performance in high-mileage or worn Polaris Sportsman 850 and Scrambler 850 ATVs. This top end kit includes everything needed for a complete top end rebuild, ensuring reliable operation and extended engine life. The .020 over bore top end kit is a popular choice for riders seeking a cost-effective rebuild without sacrificing quality.

Built For Performance

• Machined from high-strength aluminum alloy for durability and heat dissipation
• Precision-honed cylinder bore ensures proper ring seal and compression
• Includes forged piston, piston rings, wrist pin, and circlips
• .020 over bore size increases displacement slightly for added torque
• Direct fit design reduces installation time and complexity

Fits These Machines

• for Polaris Sportsman 850
• for Polaris Scrambler 850

On-The-Job Use

• Trail riding and recreational off-road use
• Utility work requiring consistent engine performance
• Engine rebuilds after high mileage or scoring
• Competitive and sport riding applications

Specs At A Glance

Good To Know

Q: Is this top end kit compatible with both the Sportsman 850 and Scrambler 850? A: Yes, this Namura .020 over bore top end kit is designed to fit both Polaris Sportsman 850 and Scrambler 850 models with the same engine platform.

Q: Do I need to replace the cylinder head gasket separately? A: The kit includes the cylinder and piston assembly, but you should order a separate head gasket and base gasket for 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.