2 Namura .020 Over Bore Piston Kits fits Polaris Sportsman 850 Scrambler 87.5mm

2 Namura .020 Over Bore Piston Kits for Polaris Sportsman 850 Scrambler 87.5mm

These .020 over bore piston kits from Namura are designed for rebuilding Polaris Sportsman 850 and Scrambler engines, providing a precise 87.5mm bore size for increased displacement and performance.

Overview

These piston kits from Namura offer a cost-effective way to refresh or increase displacement on Polaris Sportsman 850 and Scrambler models. Each kit includes two pistons, rings, pins, and clips for a complete top-end rebuild. With a .020 over bore and 87.5mm diameter, they restore compression and power while extending engine life.

Built For Performance

• Manufactured from high-silicon aluminum alloy for strength and heat dissipation
• Precision-machined skirt profile reduces friction and wear
• Includes moly-coated rings for improved sealing and reduced break-in time
• Each piston is weight-matched for balanced engine operation
• Designed to match OEM specifications for reliable fitment

Fits These Machines

• for Polaris Sportsman 850
• for Polaris Scrambler 850

On-The-Job Use

• Trail riding and recreational off-roading
• Utility work and farm use
• Competitive racing and sport riding
• Engine rebuilds and performance upgrades

Specs At A Glance

Good To Know

Q: Are these pistons compatible with the stock cylinder? A: Yes, they are designed as a direct .020 over bore replacement for the stock cylinder bore, but the cylinder must be honed or bored to the exact 87.5mm size by a qualified machinist.

Q: Can I reuse the old wrist pins or clips? A: It is recommended to use the included new wrist pins and clips for proper fit and to prevent premature wear or failure.

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