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

SPI .010 Over Bore Piston Kit for Polaris

This SPI .010 over bore piston kit is engineered for Polaris 550 fan-cooled engines from 1999 to 2021, delivering a precise 73.25mm bore for engine rebuilding.

Overview

This SPI .010 over bore piston kit provides a high-quality replacement for Polaris 550 fan-cooled engines. The kit includes a 73.25mm piston, rings, and wrist pin for a complete top-end rebuild. It is an ideal solution for restoring compression and performance in your Polaris engine.

Built For Performance

• 73.25mm bore size for .010 inch overbore application
• High-strength aluminum alloy for durability and heat management
• Includes precision-ground piston rings for proper sealing
• Includes wrist pin and circlips for complete assembly
• Designed to match OEM specifications for direct fitment

Fits These Machines

• for Polaris 550 Fan Cooled (1999-2021)

On-The-Job Use

• Engine top-end rebuilds on Polaris snowmobiles and utility vehicles
• Restoring lost compression due to normal wear
• Performance rebuilding for improved throttle response
• Replacement after piston scuffing or seizure

Specs At A Glance

Good To Know

Q: Does this piston kit include rings and wrist pin? A: Yes, the kit comes with the piston, rings, wrist pin, and circlips for a complete top-end set.

Q: Can this .010 over piston be used on standard bore engines? A: No, it requires the cylinder to be bored to 73.25mm; it is not a drop-in replacement for a standard bore.

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