SPI .040 Over Bore Piston Kit for Polaris Indy 600 XCR, XLT, Triumph 66mm

SPI .040 Over Bore Piston Kit for Polaris

This SPI .040 over bore piston kit is a direct replacement for Polaris Indy 600, XCR, XLT, and Triumph 66mm engines, providing a 66mm piston with .040-inch oversize for rebuilding worn cylinders.

Overview

The SPI .040 over bore piston kit delivers a high-quality 66mm piston designed for Polaris snowmobile engines needing an overbore rebuild. This piston kit includes rings, wrist pin, and circlips for a complete top-end restoration on Polaris Indy 600, XCR, XLT, and Triumph models.

Built For Performance

• .040-inch overbore increases displacement and restores compression
• 66mm piston diameter matches OEM specifications for these Polaris engines
• Includes premium piston rings for reliable sealing and long life
• Wrist pin and circlips included for a complete installation
• High-strength aluminum alloy construction withstands high RPM operation

Fits These Machines

• for Polaris Indy 600
• for Polaris XCR
• for Polaris XLT
• for Polaris Triumph 66mm

On-The-Job Use

• Rebuilding a worn top end on a Polaris snowmobile
• Restoring engine performance after cylinder wear or scoring
• Trail riding and recreational snowmobiling requiring reliable power
• Competitive snowmobile racing where overbore is allowed

Specs At A Glance

Good To Know

Q: Do I need to hone the cylinder before installing this piston kit? A: Yes, a cylinder hone is recommended to achieve proper ring seating and ensure the piston slides smoothly in the bore.

Q: What is the recommended ring gap for this .040 over piston? A: Ring gap should be measured and set according to the manufacturer's specifications, typically between 0.010-0.020 inches for the top ring.

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