2 SPI .020 Over Bore Piston Kits for Polaris 550 Fan Cooled 1999-2021 - 73.5mm

2 SPI .020 Over Bore Piston Kits for Polaris 550 Fan Cooled

These .020 over bore piston kits for Polaris 550 fan cooled engines (73.5mm) include two pistons, rings, pins, and clips for engine rebuilding.

Overview

These piston kits for Polaris 550 fan cooled snowmobiles provide a .020 over bore (73.5mm) size to restore compression and performance. Designed for Polaris 550 fan cooled engines from 1999 to 2021, these kits offer a cost-effective rebuild solution. Each kit contains two pistons with rings, wrist pins, and circlips for a complete top-end overhaul.

Built For Performance

• .020 over bore (73.5mm) for worn cylinder clearance
• Includes two pistons with precision-machined ring grooves
• Complete set with rings, wrist pins, and circlips
• Designed for Polaris 550 fan cooled engine specifications
• High-quality cast aluminum construction

Fits These Machines

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

On-The-Job Use

• Snowmobile engine top-end rebuilds
• Restoring lost compression due to wear
• Replacing damaged or scored pistons
• Rebuilding vintage Polaris 550 fan cooled engines

Specs At A Glance

Good To Know

Q: Are these piston kits compatible with all Polaris 550 fan cooled models? A: These kits are designed for Polaris 550 fan cooled engines from 1999 to 2021, but always verify your cylinder bore condition and serial number for exact fitment.

Q: Do I need to replace the piston rings separately? A: No, each kit includes pistons, rings, wrist pins, and circlips—everything needed for a complete piston replacement.

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