Namura Technologies NA-50091-B Piston Kit - Big Bore 98mm.

Bore: 92.96mm
Sizing: 0.10in. Oversize

MOS2 (Teflon/Molybdenum) Coated Skirts - A rolled on application process provides a bond that is 10 times stronger than other spray on coatings. Benefits include increased heat transfer, reduced friction and helping to eliminate cold seizures. Machined Smooth Heads - Reflects combustion heat and reduces carbon buildup, protecting the top of the piston. Some tests have shown this feature can increase horsepower and fuel economy by up to 6%. Anodized Domes - Increases heat resistance and durability; pistons with anodized domes are 75% stronger than non-anodized pistons. Hypereutectic Casting Process - Provides higher silicon content for reduced expansion rates and additional wear resistance; it also has an ability to withstand higher cylinder temperatures.

Vehicle Fitment:

2016 Polaris ACE
2016 Polaris ACE 900 SP
2017-2019 Polaris ACE 900 XC
2020-2021 Polaris General 1000
2016-2019 Polaris General 1000 EPS
2025-2026 Polaris General 1000 Premium
2025-2026 Polaris General 1000 Sport
2020 Polaris General 4 1000
2017-2019 Polaris General 4 1000 EPS
2020-2025 Polaris Ranger 1000
2014-2015 Polaris Ranger 900 Crew
2013-2015 Polaris Ranger 900 XP
2017 Polaris Ranger Crew XP 1000
2025-2026 Polaris Ranger Crew XP 1000 NorthStar Edition Trail Boss
2025-2026 Polaris Ranger Crew XP 1000 NorthStar Premium
2025-2026 Polaris Ranger Crew XP 1000 NorthStar Texas Edition
2025-2026 Polaris Ranger Crew XP 1000 NorthStar Ultimate
2025-2026 Polaris Ranger Crew XP 1000 Premium
2025-2026 Polaris Ranger Crew XP 1000 Texas Edition
2025 Polaris Ranger Crew XP 1000 Waterfowl Edition
2017-2019 Polaris Ranger Crew XP 900
2017 Polaris Ranger XP 1000
2025-2026 Polaris Ranger XP 1000 NorthStar Edition Trail Boss
2025-2026 Polaris Ranger XP 1000 NorthStar Premium
2025-2026 Polaris Ranger XP 1000 NorthStar Ultimate
2025-2026 Polaris Ranger XP 1000 Premium
2017-2019 Polaris Ranger XP 900
2015-2017 Polaris RZR 4 900 EPS
2015-2020 Polaris RZR 900
2025 Polaris RZR Pro R 4 Factory Armored Edition
2025 Polaris RZR Pro R 4 Race Replica Edition
2025 Polaris RZR Pro R 4 Sport
2025-2026 Polaris RZR Pro R 4 Ultimate
2026 Polaris RZR Pro R 4 Ultra Edition
2025 Polaris RZR Pro R Factory
2025 Polaris RZR Pro R Factory Armored Edition
2025 Polaris RZR Pro R Factory HO
2025 Polaris RZR Pro R Race Replica Edition
2025 Polaris RZR Pro R Sport
2025-2026 Polaris RZR Pro R Ultimate
2026 Polaris RZR Pro R Ultra Edition
2025 Polaris RZR Pro S 4 Premium
2025-2026 Polaris RZR Pro S 4 Sport
2025-2026 Polaris RZR Pro S 4 Ultimate
2026 Polaris RZR Pro S 4 Ultimate Calavera Edition
2025 Polaris RZR Pro S Premium
2025-2026 Polaris RZR Pro S Sport
2025-2026 Polaris RZR Pro S Ultimate
2018-2022 Polaris RZR RS1
2016-2021 Polaris RZR S 1000 EPS
2019-2020 Polaris RZR S4 1000 EPS
2018 Polaris RZR S4 900 EPS
2015-2019 Polaris RZR XP 1000 EPS
2014-2019 Polaris RZR XP 4 1000 EPS