2 SPI .030 Over Bore Piston Kits for Polaris 500 Snow 1985-2006 488cc 72.75mm

SPI .030 Over Bore Piston Kits for Polaris 500 Snow

These SPI .030 over bore piston kits for Polaris 500 snowmobiles replace the original pistons in 1985-2006 488cc engines, sized at 72.75mm with OEM cross-reference numbers 3080422, 4040393, and 4040444.

Overview

These SPI .030 over bore piston kits for Polaris 500 snowmobiles provide a precision fit for 488cc engines from 1985-2006, restoring compression and power during a top-end rebuild. Each kit includes the piston, rings, wrist pin, and circlips, making this piston kit a complete solution for Polaris 500 snowmobile engine restoration.

Built For Performance

• 72.75mm diameter matched to .030 oversize bore
• Cast aluminum piston for reliable daily operation
• Includes piston rings, wrist pin, and circlips for full rebuild
• Designed to match OEM specifications for 488cc Polaris engines
• Durable ring set ensures proper cylinder sealing

Fits These Machines

• for Polaris 500 snowmobile 1985-2006
• for Polaris 488cc engine family

On-The-Job Use

• Perfect for rebuilding worn-out Polaris 500 snowmobile engines
• Used during top-end overhauls to restore lost compression
• Commonly installed in trail and utility snowmobiles requiring bore repair

Specs At A Glance

Good To Know

Q: Do I need to hone the cylinder before installing these piston kits? A: Yes, the cylinder must be honed or bored to the matching .030 over specification to ensure correct ring seal and proper clearance.

Q: Will these pistons work in any Polaris 500 model from 1985-2006? A: These piston kits fit Polaris 500 snowmobiles with the 488cc engine; verify your engine code and cylinder bore condition before ordering.

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