2 SPI .040 Over Bore Piston Kits for Polaris 500 RMK fits 1997 1998 1999 73mm

2 SPI .040 Over Bore Piston Kits for Polaris 500 RMK

This set includes two SPI .040 over bore piston kits designed to fit Polaris 500 RMK models from 1997 to 1999, featuring a 73mm bore size for reliable engine performance.

Overview

These SPI .040 over bore piston kits are aftermarket replacements for Polaris 500 RMK snowmobiles, delivering a 73mm bore for increased displacement and restored power. Each kit provides two pistons with rings and wrist pins, making them suitable for rebuilding engines in these vintage models.

Built For Performance

• Cast aluminum pistons with .040 oversize for improved engine output
• Accurate ring grooves for optimal compression sealing
• Complete kit includes rings and wrist pins for hassle-free installation
• Engineered for direct fitment to Polaris 500 RMK cylinders
• Manufactured to meet OEM tolerances for durability

Fits These Machines

• for Polaris 500 RMK (1997)
• for Polaris 500 RMK (1998)
• for Polaris 500 RMK (1999)

On-The-Job Use

• Rebuilding engines on mountain snowmobiles for trail and powder riding
• Restoring performance in older Polaris RMK models
• Performing top-end overhauls during winter preparation

Specs At A Glance

Good To Know

Q: Do these pistons require engine disassembly to install? A: Yes, these are top-end replacement pistons that require cylinder head and cylinder removal, followed by boring to 73mm for proper fit.

Q: Can these be used with the original cylinder? A: Only if the cylinder has been bored to 73mm; these .040 over bore pistons are not compatible with stock 72.5mm cylinders.

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