Namura .020 Over Bore Piston Kit for Polaris Sportsman 400 450 Ranger 425 88.4mm

.020 Over Bore Piston Kit for Polaris

This .020 over bore piston kit for Polaris Sportsman 400, 450, and Ranger 425 models is a high-quality replacement component designed to restore engine compression and performance after cylinder boring.

Overview

This .020 over bore piston kit for Polaris ATV and UTV models provides a precise 88.4mm piston for engines requiring an oversize rebuild. It is ideal for riders restoring their Polaris Sportsman or Ranger to peak power. 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
• Oversized .020 allows for cylinder cleanup and increased displacement
• Includes wrist pin and clips for a complete install

Fits These Machines

• for Polaris Sportsman 400
• for Polaris Sportsman 450
• for Polaris Ranger 425

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: Will this piston kit fit a standard bore engine? A: No, this kit is .020 over bore and requires the cylinder to be bored to 88.4mm. A standard bore cylinder will not accept this piston.

Q: What is included in the kit? A: The kit comes with 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.