SPI .040 Over Bore Piston Kit for Polaris 550 Fan Cooled 1999-2021 - 74mm

SPI .040 Over Bore Piston Kit for Polaris 550 Fan Cooled

This SPI .040 over bore piston kit is designed for Polaris 550 Fan Cooled engines from 1999 to 2021, featuring a 74mm bore diameter.

Overview

This piston kit from SPI is an .040 oversize replacement for Polaris 550 Fan Cooled engines. It includes a quality piston, rings, and wrist pin for a complete rebuild. The 74mm bore provides increased displacement for improved performance.

Built For Performance

• .040 oversize for increased compression and power
• High-quality alloy construction resists heat and wear
• Precision-machined piston skirts reduce friction
• Includes high-tension rings for excellent seal
• Wrist pin and circlips included for easy installation
• Designed for Polaris 550 fan-cooled engines

Fits These Machines

• for Polaris 550 Fan Cooled (1999-2021)

On-The-Job Use

• Engine rebuild and overhaul
• Restore compression and performance to older engines
• Overbore maintenance for worn cylinders
• Custom engine builds for increased displacement
• Racing or high-performance applications

Specs At A Glance

Good To Know

Q: Does this piston kit include rings? A: Yes, the kit includes a set of high-quality piston rings and a wrist pin with circlips.

Q: Can this kit be used with a standard bore cylinder? A: No, this .040 over bore piston kit requires the cylinder to be bored to 74mm to fit properly.

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