Namura .060 Over Bore Piston Kit fits Polaris 850 Scrambler & Sportsman 88.5mm

.060 Over Bore Piston Kit (88.5mm) for Polaris

This .060 over bore piston kit replaces the original piston in Polaris 850 Scrambler and Sportsman models, providing a direct fit with an 88.5mm diameter for increased displacement and performance.

Overview

This Namura .060 over bore piston kit is designed for Polaris 850 Scrambler and Sportsman ATVs, offering a reliable replacement that boosts engine displacement. The 88.5mm piston kit is ideal for rebuilding or restoring the Polaris 850 engine, ensuring smooth operation and long-lasting durability.

Built For Performance

• Precision-machined aluminum alloy construction for reduced weight and high strength
• Oversized 88.5mm bore increases engine displacement for added power
• Includes rings, wrist pin, and circlips for a complete installation
• Designed to factory specifications for a direct fit without modification
• Heat-treated skirt coating minimizes friction and wear

Fits These Machines

• for Polaris Scrambler 850
• for Polaris Sportsman 850

On-The-Job Use

• Engine rebuilds for Polaris 850 ATVs used in trail riding and utility work
• Increasing displacement for improved power output
• Replacement after top-end failure or high-mileage maintenance
• Off-road racing and recreational riding applications

Specs At A Glance

Good To Know

Q: Do I need to re-tune my carburetor or ECU after installing this piston kit? A: An over-bore piston kit changes engine displacement, so adjusting fuel delivery is recommended to maintain proper air-fuel ratio; consult the service manual or a professional tuner.

Q: Can I use this piston kit with the existing cylinder? A: No, the .060 over bore requires the cylinder to be bored to the matching 88.5mm diameter by a qualified machine shop before installation.

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