Namura .040 Over Bore Piston Rings for Polaris 570 Sportsman, RZR, Ranger 100mm

Namura .040 Over Bore Piston Rings for Polaris

These Namura .040 over bore piston rings are designed for Polaris 570 engines including Sportsman, RZR, and Ranger models with a 100mm bore, replacing worn rings to restore compression and reduce oil consumption. The piston rings feature a precise gap and durable steel construction for long service life. This set of piston rings ensures proper ring-to-cylinder sealing for increased power and efficiency.

Overview

This set of Namura .040 over bore piston rings is intended for the Polaris 570 engine family (Sportsman, RZR, Ranger) and uses a 100mm bore diameter. The piston rings are manufactured from high-quality steel to handle the demands of ATV and UTV operation. These rings restore compression and reduce blow-by, improving overall engine performance and reliability.

Built For Performance

• Precision ground ring ends for consistent gap tolerance
• Made from high-strength steel for wear resistance
• .040 over bore size accommodates reconditioned cylinders
• Designed to work with standard ring groove dimensions
• Reduces oil consumption and prevents smoking at start-up
• Improves cylinder sealing for maximum compression

Fits These Machines

• for Polaris Sportsman 570
• for Polaris RZR 570
• for Polaris Ranger 570

On-The-Job Use

• Recreational trail riding and mudding
• Utility work around the farm or ranch
• Sport riding and light racing applications
• Engine rebuilds during top end overhauls

Specs At A Glance

Good To Know

Q: Are these rings compatible with a stock cylinder after a bore? A: Yes, these .040 over rings are meant for cylinders that have been bored to 100mm, typically during a rebuild.

Q: Do I need to gap these rings before installation? A: Always check ring end gap according to factory specifications; these rings are pre-sized but final gapping should be verified during assembly.

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