2 SPI .010 Over Bore Piston Kits for Polaris 550 Fan Cooled 1999-2021 - 73.25mm

2 Piston Kits (0.010 Over Bore) for Polaris 550 Fan Cooled 1999-2021 73.25mm

This set of two piston kits provides a 0.010 oversize bore for rebuilding Polaris 550 fan-cooled engines from 1999 to 2021, with a 73.25mm piston diameter.

Overview

These 0.010 over bore piston kits are designed for Polaris 550 fan-cooled engines spanning 1999 to 2021. Each kit includes two pistons at 73.25mm for oversize cylinder boring. This piston kit set ensures a proper fit after cylinder overbore for reliable engine performance.

Built For Performance

• Oversize 0.010 for worn cylinder restoration
• Includes two complete piston assemblies
• High-strength aluminum alloy construction
• Precision-machined ring grooves
• Includes piston rings and wrist pins
• Direct replacement for OEM specifications

Fits These Machines

• for Polaris 550 Fan Cooled models (1999-2021)

On-The-Job Use

• ATV trail riding and recreation
• Farm and ranch utility vehicles
• Engine overhauls and performance rebuilds
• Off-road utility tasks

Specs At A Glance

Good To Know

Q: Do these pistons require cylinder boring? A: Yes, the 0.010 oversize pistons require the cylinder to be bored to the corresponding size.

Q: Are the piston rings included? A: Yes, each kit includes piston rings and wrist pin hardware.

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