Namura .040 Over Bore Piston Kit for Polaris Sportsman 90 fits 2001-2006 53mm

Namura .040 Over Bore Piston Kit for Polaris Sportsman 90

This Namura .040 over bore piston kit with a 53mm diameter provides a direct replacement to restore compression and power in Polaris Sportsman 90 engines from 2001 to 2006.

Overview

The Namura .040 over bore piston kit for Polaris Sportsman 90 is a precision-engineered component designed to revive engine performance in 2001-2006 models. This 53mm piston kit replaces worn factory pistons to restore compression and output. It suits ATV enthusiasts needing a reliable overbore repair solution.

Built For Performance

• Manufactured from high-strength aluminum alloy for durability
• .040 inch overbore increases displacement slightly
• Includes piston rings and wrist pin for complete installation
• Precision-machined to factory tolerances for reliable fit
• Designed to handle high RPM operation in Polaris Sportsman 90

Fits These Machines

• for Polaris Sportsman 90 2001
• for Polaris Sportsman 90 2002
• for Polaris Sportsman 90 2003
• for Polaris Sportsman 90 2004
• for Polaris Sportsman 90 2005
• for Polaris Sportsman 90 2006

On-The-Job Use

• Replaces worn original pistons in high-mileage ATV engines
• Used during top-end rebuilds for improved compression
• Suitable for recreational trail riding and utility work
• Commonly installed by ATV mechanics and DIY enthusiasts

Specs At A Glance

Good To Know

Q: Does this piston kit include wrist pin and circlips? A: Yes, the kit comes with a wrist pin and circlips for a complete installation requiring no additional parts.

Q: Will this .040 over piston work with a standard cylinder bore? A: No, the cylinder must be bored to 53mm to accept the .040 over piston; 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.