SPI Standard Bore Top End Repair Kit for Polaris 900 Fusion RMK Switchback 83mm

Standard Bore Top End Repair Kit for Polaris

This top end repair kit includes all components needed to rebuild the cylinder and piston assembly for Polaris 900 Fusion, RMK, and Switchback models with an 83mm bore, restoring compression and performance.

Overview

The SPI Standard Bore Top End Repair Kit is a complete rebuild solution for Polaris 900 series snowmobiles. This top end repair kit provides pistons, rings, wrist pins, and gaskets to restore factory compression and power. Designed for Polaris 900 engines, this top end repair kit ensures reliable operation in deep snow and rugged terrain.

Built For Performance

• Precision-machined pistons with exact 83mm bore sizing
• High-strength piston rings for optimal sealing and longevity
• Durable wrist pins and circlips included
• Complete gasket set for a secure top end rebuild
• OEM-spec components for direct replacement

Fits These Machines

• for Polaris 900 Fusion
• for Polaris 900 RMK
• for Polaris 900 Switchback

On-The-Job Use

• Restores engine compression and power on snowmobiles
• Essential for routine top end maintenance every 2-3 seasons
• Improves throttle response and acceleration
• Replaces worn pistons and rings to prevent engine failure

Specs At A Glance

Good To Know

Q: Does this kit include cylinder head gaskets? A: Yes, the kit comes with a complete gasket set including base and head gaskets for a thorough rebuild.

Q: What is the recommended break-in procedure after installation? A: Follow a gentle break-in for the first hour of operation, varying throttle and avoiding sustained high RPMs to allow rings to seat properly.

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