2 Namura .040 Over Bore Piston Kits fits Polaris Sportsman 850 Scrambler 88mm

2 Namura .040 Over Bore Piston Kits for Polaris

These two Namura .040 over bore piston kits are designed to fit Polaris Sportsman 850 and Scrambler models with an 88mm bore. They provide a reliable replacement for worn pistons during engine rebuilds.

Overview

These Namura .040 over bore piston kits include two piston assemblies engineered for Polaris Sportsman 850 and Scrambler ATVs with an 88mm bore. Each kit comes with piston rings and wrist pins for a complete top-end overhaul. They are an economical choice for restoring compression and performance in high-mileage engines.

Built For Performance

• High-strength aluminum alloy construction for durability
• Precision-machined to .040 oversize for resurfaced cylinders
• Includes piston rings with proper end gap for reliable sealing
• Lightweight design reduces reciprocating mass
• Heat-treated for improved thermal stability

Fits These Machines

• for Polaris Sportsman 850
• for Polaris Scrambler (with 88mm bore)

On-The-Job Use

• Engine rebuilds for ATVs used in trail riding and utility work
• Restoring power and efficiency in high-mileage Polaris engines
• Performance restoration after cylinder reconditioning
• Farm and ranch vehicle maintenance

Specs At A Glance

Good To Know

Q: Are these piston kits complete with rings and pins? A: Yes, each kit includes the piston, rings, and wrist pin – everything needed for a full top-end overhaul.

Q: Do I need to recondition the cylinder before installing these .040 over pistons? A: Yes, these oversized pistons are intended for use after the cylinder has been bored to 88mm, so professional machining is required.

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