The NAMURA NA-50026 Piston Kit is a standard-size replacement piston assembly designed for selected Polaris ATV and utility vehicle applications. Manufactured by NAMURA and supplied under vendor part number NA-50026, this kit is intended for restoring reliable engine performance when the original piston requires replacement. The standard 87.89 mm piston size supports a proper fit in compatible factory-standard cylinder applications.
This piston kit fits 2008–2014 Polaris Sportsman 400 HO 2x4 models, 2006–2007 Polaris Sportsman 450 models, and the 2010 Polaris Ranger 400 4X4 Midsize. Confirm the exact year, model, engine configuration, and required piston size before installation to ensure compatibility. This kit will not accept OEM piston rings, and its rings will not work on an OEM piston; use the rings supplied or specified for the NAMURA NA-50026 piston kit.
Designed for repair and engine rebuilding applications, the NAMURA NA-50026 provides a direct replacement solution for compatible standard-bore engines. Proper installation should include inspection of the cylinder, piston clearance, wrist pin components, and related engine parts according to the vehicle manufacturer’s service procedures. Verify fitment and installation specifications before disassembly or assembly.
Features:
- Standard 87.89 mm piston size for compatible factory-standard cylinder applications
- NAMURA manufacturer and NA-50026 vendor part number
- Fits 2008–2014 Polaris Sportsman 400 HO 2x4 models
- Fits 2006–2007 Polaris Sportsman 450 models
- Fits the 2010 Polaris Ranger 400 4X4 Midsize
- Will not accept OEM piston rings, and the supplied rings will not work on an OEM piston
- Replacement piston kit for compatible engine repair and rebuilding applications
Fitment:
2001 Polaris Sportsman 400 4X4
2002 Polaris Sportsman 400 4X4
2003 Polaris Ranger 425 2X4
2003 Polaris Sportsman 400 4X4
2004 Polaris Ranger 425 2X4
2004 Polaris Sportsman 400 4X4
2005 Polaris Sportsman 400 4X4
2006 Polaris Sportsman 450
2007 Polaris Sportsman 450
2008 Polaris Sportsman 400 HO 2x4
2009 Polaris Sportsman 400 HO 2x4
2010 Polaris Ranger 400 4X4 [Midsize]
2010 Polaris Sportsman 400 HO 2x4
2011 Polaris Ranger 400 4X4 [Midsize]
2011 Polaris Sportsman 400 HO 2x4
2012 Polaris Hawkeye 400 HO 2x4
2012 Polaris Ranger 400 4X4 [Midsize]
2012 Polaris Sportsman 400 HO 2x4
2013 Polaris Hawkeye 400 HO 2x4
2013 Polaris Ranger 400 4X4 [Midsize]
2013 Polaris Sportsman 400 HO 2x4
2014 Polaris Hawkeye 400 HO 2x4
2014 Polaris Ranger 400 4X4 [Midsize]
2014 Polaris Sportsman 400 HO 2x4