Namura Standard Bore Piston Rings for Polaris 570 Sportsman, RZR & Ranger 99mm

Standard Bore Piston Rings for Polaris

Namura standard bore piston rings designed for Polaris 570 engines found in Sportsman, RZR, and Ranger models, featuring a 99mm bore size.

Overview

These Namura standard bore piston rings are a direct replacement for the original rings in Polaris 570 engines. They fit Sportsman, RZR, and Ranger models with a 99mm cylinder bore, making these piston rings ideal for engine rebuilds on 570cc Polaris machines.

Built For Performance

• Made from high-grade cast iron for wear resistance
• Precision-machined ring faces for optimal cylinder seal
• Standard bore size (99mm) for stock cylinder dimensions
• Includes top compression ring, second compression ring, and oil ring assembly
• Compatible with OEM and aftermarket pistons of standard size

Fits These Machines

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

On-The-Job Use

• Rebuilding a Polaris 570 engine after a top-end failure
• Restoring compression on a high-mileage Sportsman 570
• Performing a cylinder hone and ring replacement on a RZR 570
• Replacing piston rings during a full engine overhaul on a Ranger 570

Specs At A Glance

Good To Know

Q: Can these rings be used with a .020 over bore piston? A: No, these are standard bore rings for 99mm cylinders; they will not fit oversize pistons. Use Namura oversize rings for .020 or .040 over bores.

Q: Do these rings require any special break-in procedure? A: Yes, after installation follow the engine manufacturer's break-in guidelines, typically avoiding sustained high RPM for the first hour of operation.

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