The Namura NA-50012-B piston kit is designed for select Polaris 850 power-sports applications requiring an 86.94 mm piston size. This replacement piston kit is engineered for use with specified 2015–2017 Polaris Sportsman 850, Sportsman 850 SP, Sportsman Touring 850 SP, and 2015 Polaris Scrambler 850 models. Verify the model year and engine application before installation to ensure proper fitment.
Important Compatibility Notice: This Namura piston kit will not accept OEM piston rings, and the included or compatible rings will not work with an OEM piston. The piston and ring combination should be installed as a matched set according to the manufacturer's specifications. Professional installation and clearance verification are recommended during engine rebuilding or top-end service.
Manufactured by Namura and supplied under vendor part number NA-50012-B, this kit provides a direct replacement option for restoring compression and supporting dependable engine performance. The application-specific design helps simplify replacement when servicing the top end of a compatible Polaris engine. Always compare the existing piston, cylinder, and engine specifications with the application information before ordering.
Fitment: 2015–2017 Polaris Sportsman 850; 2015–2017 Polaris Sportsman 850 SP; 2015–2017 Polaris Sportsman Touring 850 SP; 2015 Polaris Scrambler 850.
Features:
- Size: 86.94 mm piston diameter
- Model: NA-50012-B
- Brand: Namura
- Manufacturer Part Number: NA-50012-B
- Vendor Part Number: NA-50012-B
- Application: Select Polaris 850 ATV models
- Fitment: 2015–2017 Polaris Sportsman 850, Sportsman 850 SP, and Sportsman Touring 850 SP; 2015 Polaris Scrambler 850
- Compatibility: Will not accept OEM piston rings, and the rings will not work with an OEM piston
Fitment:
2009 Polaris Sportsman XP 850
2009 Polaris Sportsman XP 850 EPS
2010 Polaris Sportsman Touring 850 EPS
2010 Polaris Sportsman XP 850
2010 Polaris Sportsman XP 850 EPS
2011 Polaris Sportsman Touring 850 EPS
2011 Polaris Sportsman X2 850
2011 Polaris Sportsman XP 850
2011 Polaris Sportsman XP 850 EPS
2012 Polaris Sportsman Touring 850 EPS
2012 Polaris Sportsman XP 850
2012 Polaris Sportsman XP 850 EPS
2013 Polaris Scrambler XP 850
2013 Polaris Scrambler XP 850 EPS
2013 Polaris Sportsman Touring 850 EPS
2013 Polaris Sportsman XP 850
2013 Polaris Sportsman XP 850 EPS
2014 Polaris Scrambler XP 850
2014 Polaris Scrambler XP 850 EPS
2014 Polaris Sportsman 850 HO Wv
2014 Polaris Sportsman Touring 850 EPS
2014 Polaris Sportsman XP 850 EPS
2015 Polaris Scrambler 850
2015 Polaris Sportsman 850
2015 Polaris Sportsman 850 SP
2015 Polaris Sportsman Touring 850 SP
2016 Polaris Scrambler 850
2016 Polaris Sportsman 850
2016 Polaris Sportsman 850 SP
2016 Polaris Sportsman Touring 850 SP
2017 Polaris Scrambler 850
2017 Polaris Sportsman 850
2017 Polaris Sportsman 850 SP
2017 Polaris Sportsman Touring 850 SP
2018 Polaris Scrambler 850
2018 Polaris Sportsman 850
2018 Polaris Sportsman 850 SP
2018 Polaris Sportsman Touring 850 SP
2019 Polaris Scrambler 850
2019 Polaris Sportsman 850
2019 Polaris Sportsman 850 SP
2019 Polaris Sportsman Touring 850 SP
2020 Polaris Sportsman 850
2020 Polaris Sportsman Touring 850 EPS