The Namura NA-50004-2 Piston Kit is a +0.020-inch oversize replacement piston assembly designed for select Polaris 500 engines. With a 92.47 mm piston size, this kit is intended for properly bored and prepared cylinders requiring an oversize piston. It is designed for dependable service in powersports and utility vehicle applications.
Fitment: Fits 2011–2013 Polaris Sportsman Touring 500 HO, 2011–2013 Polaris Ranger Crew 500 4x4, 1999–2000 Polaris Sportsman 500 RSE 4x4, and 1998–1999 Polaris Big Boss 500 6x6. Verify engine specifications, bore requirements, and model compatibility before installation.
This Namura piston kit uses manufacturer part number NA-50004-2 and is supplied for applications that require the specified oversize piston. The kit will not accept OEM piston rings, and the included rings are not compatible with an OEM piston. Use the correct matching components and follow the vehicle manufacturer’s service procedures for cylinder preparation, piston installation, ring positioning, and break-in.
Features:
- Size: 92.47 mm piston size, equivalent to a +0.020-inch oversize application
- Model: Replacement piston kit for select Polaris 500 engines
- Brand: Namura
- Manufacturer Part Number: NA-50004-2
- Vendor Part Number: NA-50004-2
- Fitment: 2011–2013 Polaris Sportsman Touring 500 HO
- Fitment: 2011–2013 Polaris Ranger Crew 500 4x4
- Fitment: 1999–2000 Polaris Sportsman 500 RSE 4x4
- Fitment: 1998–1999 Polaris Big Boss 500 6x6
- Compatibility: Will not accept OEM rings, and the rings will not work with an OEM piston
Fitment:
1996 Polaris Sportsman 500 4X4
1997 Polaris Scrambler 500 4X4
1997 Polaris Sportsman 500 4X4
1997 Polaris Xplorer 500 4X4
1998 Polaris Big Boss 500 6X6
1998 Polaris Scrambler 500 4X4
1998 Polaris Sportsman 500 4X4
1999 Polaris Big Boss 500 6X6
1999 Polaris Magnum 500 4X4
1999 Polaris Ranger 500 6X6
1999 Polaris Scrambler 500 4X4
1999 Polaris Sportsman 500 4X4
1999 Polaris Sportsman 500 Rse 4x4
2000 Polaris Magnum 500 4X4
2000 Polaris Ranger 500 6X6
2000 Polaris Scrambler 500 4X4
2000 Polaris Sportsman 500 4X4
2000 Polaris Sportsman 500 Rse 4x4
2000 Polaris Sportsman 6X6 500
2001 Polaris Magnum 500 4X4
2001 Polaris Ranger 500 4X4
2001 Polaris Ranger 500 6X6
2001 Polaris Scrambler 500 2X4
2001 Polaris Scrambler 500 4X4
2001 Polaris Sportsman 500 HO 2x4
2001 Polaris Sportsman 500 HO RSE
2001 Polaris Sportsman 6X6 500
2002 Polaris Magnum 500 2X4
2002 Polaris Magnum 500 4X4
2002 Polaris Ranger 500 4X4
2002 Polaris Ranger 500 6X6
2002 Polaris Scrambler 500 2X4
2002 Polaris Scrambler 500 4X4
2002 Polaris Sportsman 500 HO 2x4
2002 Polaris Sportsman 500 HO RSE
2002 Polaris Sportsman 6X6 500
2003 Polaris Ranger 500 4X4
2003 Polaris Ranger 500 6X6
2003 Polaris Scrambler 500 4X4
2003 Polaris Sportsman 500 HO 2x4
2003 Polaris Sportsman 6X6 500
2004 Polaris Atp 500
2004 Polaris Ranger 500 4X4
2004 Polaris Ranger 500 6X6
2004 Polaris Scrambler 500 4X4
2004 Polaris Sportsman 500 HO 2x4
2004 Polaris Sportsman 6X6 500
2005 Polaris Atp 500
2005 Polaris Ranger 500 2X4
2005 Polaris Ranger 500 4X4
2005 Polaris Ranger 500 6X6
2005 Polaris Scrambler 500 4X4
2005 Polaris Sportsman 500 HO 2x4
2005 Polaris Sportsman 6X6 500
2006 Polaris Ranger 500 2X4
2006 Polaris Ranger 500 4X4
2006 Polaris Ranger 500 4X4 EFI
2006 Polaris Scrambler 500 4X4
2006 Polaris Sportsman 500 Efi
2006 Polaris Sportsman 500 HO 2x4
2006 Polaris Sportsman 6X6 500
2006 Polaris Sportsman X2 500
2007 Polaris Ranger 500 2X4
2007 Polaris Ranger 500 4X4
2007 Polaris Ranger 500 4X4 EFI
2007 Polaris Scrambler 500 4X4
2007 Polaris Sportsman 500 Deluxe
2007 Polaris Sportsman 500 Efi
2007 Polaris Sportsman 6X6 500
2007 Polaris Sportsman X2 500
2007 Polaris Sportsman X2 500 Deluxe
2008 Polaris Ranger 500 2X4
2008 Polaris Ranger 500 4X4 EFI
2008 Polaris Scrambler 500 4X4
2008 Polaris Sportsman 500 Efi
2008 Polaris Sportsman 500 HO 2x4
2008 Polaris Sportsman 6X6 500
2008 Polaris Sportsman Touring 500
2008 Polaris Sportsman X2 500
2009 Polaris Ranger 500 2X4
2009 Polaris Ranger 500 4X4 EFI
2009 Polaris Scrambler 500 4X4
2009 Polaris Sportsman 500 Efi
2009 Polaris Sportsman 500 HO 2x4
2009 Polaris Sportsman Touring 500
2009 Polaris Sportsman X2 500
2010 Polaris Ranger 500 4X4 EFI
2010 Polaris Scrambler 500 4X4
2010 Polaris Sportsman 500 HO 2x4
2010 Polaris Sportsman Touring 500 HO
2011 Polaris Ranger 500 4X4 EFI
2011 Polaris Ranger Crew 500 4x4
2011 Polaris Scrambler 500 4X4
2011 Polaris Sportsman 500 HO 2x4
2011 Polaris Sportsman Touring 500 HO
2012 Polaris Ranger 500 4X4 EFI
2012 Polaris Ranger Crew 500 4x4
2012 Polaris Scrambler 500 4X4
2012 Polaris Sportsman 500 HO 2x4
2012 Polaris Sportsman Touring 500 HO
2013 Polaris Ranger 500 4x4 EFI [Midsize]
2013 Polaris Ranger Crew 500 4x4
2013 Polaris Sportsman 500 HO 2x4
2013 Polaris Sportsman Touring 500 HO