SPI Standard Bore Piston Rings for Polaris 900 Fusion, RMK & Switchback 83mm

Standard Bore Piston Rings for Polaris

These standard bore piston rings provide the necessary seal between the piston and cylinder wall for peak combustion efficiency.

Overview

The standard bore piston rings act as a pressure seal to prevent blow-by during engine operation. These standard bore piston rings are manufactured to match an 83mm cylinder diameter for consistent fitment. Using these standard bore piston rings restores lost compression and power in your two-stroke engine.

Built For Performance

• High-durability cast iron composition
• Engineered for precise ring land seating
• Optimized tension for minimal wall friction
• High heat dissipation properties

On-The-Job Use

• Top-end engine service
• Restoring compression for snowmobile engines
• Routine rebuilds for high-mileage machines

Specs At A Glance

Good To Know

Q: Do I need to hone the cylinder before installing? A: Yes, lightly deglazing the cylinder wall is necessary to help the new rings seat properly.

Q: How do I check end gap? A: Place the ring into the cylinder and use a feeler gauge to verify the measurement remains within factory specifications.

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