The Namura NA-50091R is a standard-bore piston ring set (92.95mm) designed for various Polaris 900 and 1000 models. It is a direct replacement for the rings used in Namura piston kits and typically matches OEM designs.

Vehicle Fitment List

This ring set is confirmed to fit the following Polaris models:

• Ranger XP 900 / Crew: 2013–2019

• Ranger 1000 (Non-XP): 2020–2025

• Ranger XP 1000 / Crew: 2017–2025

• RZR 900 (Trail/S/4): 2015–2025

• RZR XP 1000 / RZR 4 1000: 2014–2023

• RZR RS1: 2018–2022

• General 1000 / General 4: 2016–2025

• ACE 900 SP / XC: 2016–2019

Key Product Details

The Namura NA-50091R Ring Set is engineered to meet or exceed OEM specifications for high-performance UTV engines.

• Bore Size: 92.95 mm (Standard)

• Kit Contents: Includes the top ring, second ring, and a three-piece oil ring set (enough for one piston).

• Materials: Compression rings are made of ductile cast iron or stainless steel and coated with wear-resistant coatings (chrome, phosphate, or nitride) to ensure a gas-tight seal.

• Oil Control: The oil ring set features two scraper rails and a stainless-steel expansion ring to manage lubrication efficiently.

Technical Compatibility Note

These rings are designed for use with Namura pistons and most OEM Polaris pistons that utilize standard 92.95mm sizing. If you are using an aftermarket piston from another brand (like Wiseco or Vertex), please verify the ring groove dimensions, as they may differ from the Namura/OEM spec.