Namura Standard Bore Piston Kit fits Polaris 400 450 Sportsman Ranger 400 87.9mm

Standard Bore Piston Kit for Polaris

This standard bore piston kit for Polaris 400, 450 Sportsman and Ranger 400 models is a direct replacement component designed to restore engine performance without cylinder boring.

Overview

This standard bore piston kit for Polaris ATV and UTV models provides a precise 87.9mm piston for engines requiring a factory-size rebuild. It is ideal for riders refreshing their Polaris Sportsman or Ranger engine with OEM-spec components. The kit includes piston, rings, and wrist pin for a complete top-end overhaul.

Built For Performance

• Precision-machined from high-strength aluminum alloy for durability
• Includes chrome-plated rings for reduced friction and long life
• Designed to match OEM specifications for a direct fit
• Standard bore size eliminates need for cylinder boring
• Includes wrist pin and clips for a complete install

Fits These Machines

• for Polaris Sportsman 400
• for Polaris Sportsman 450
• for Polaris Ranger 400

On-The-Job Use

• Trail riding and recreational off-road use
• Work applications like hauling and towing on farms
• Engine rebuilds for worn-out top ends
• Restoration projects for older Polaris models

Specs At A Glance

Good To Know

Q: Does this piston kit require cylinder boring? A: No, this is a standard bore piston at 87.9mm designed for a stock cylinder. It should be installed in a cylinder that is within factory wear limits.

Q: What is included in the kit? A: The kit includes the piston, rings, wrist pin, and circlips. You may need to reuse your original piston pin or purchase separately if not included.

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