Namura Standard Bore Piston Kit for Polaris 300 Xplorer, Xpress, Big Boss 74.5mm

Standard Bore Piston Kit for Polaris

This standard bore piston kit for Polaris 300 Xplorer, Xpress, and Big Boss models features a 74.5mm diameter and restores engine compression for reliable power.

Overview

This standard bore piston kit for Polaris ATVs provides a direct replacement for worn pistons in 300 series engines. It is designed for models such as Xplorer, Xpress, and Big Boss, using a 74.5mm bore diameter. The kit includes everything needed for a rebuild, ensuring your Polaris engine runs smoothly.

Built For Performance

• Precision-cast aluminum alloy construction for durability
• Includes piston rings and wrist pin for complete installation
• 74.5mm standard bore size for Polaris 300 engines
• Engineered to meet OEM specifications for fit and performance
• Reduces engine wear and improves compression efficiency

Fits These Machines

• for Polaris 300 Xplorer
• for Polaris 300 Xpress
• for Polaris Big Boss

On-The-Job Use

• Restores power and reliability in trail riding ATVs
• Ideal for rebuilding engines in utility vehicles used on farms and ranches
• Compatible with recreational and work-oriented Polaris models

Specs At A Glance

Good To Know

Q: How do I install this piston kit? A: Installation requires basic engine disassembly and proper ring orientation; refer to a service manual for torque specifications.

Q: Does this kit include a gasket set? A: No, this kit includes only the piston, rings, and wrist pin; gaskets must be purchased separately.

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