Restore top-end performance with the Namura NA-50004-6K Top End Kit, designed for select Polaris 500 ATV applications. This complete kit includes a piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit for a convenient rebuild solution. The 93.47 mm piston size and 11:1 compression ratio are engineered to support reliable fitment and performance when servicing compatible engines.
The piston features MOS2, or Teflon and molybdenum, coated skirts applied through a rolled-on process for a strong, durable bond. This coating helps improve heat transfer, reduce friction, and minimize the risk of cold seizures. Machined smooth piston heads help reflect combustion heat and reduce carbon buildup, while anodized domes improve heat resistance and durability.
Namura uses a hypereutectic casting process that increases silicon content to help control expansion, improve wear resistance, and withstand elevated cylinder temperatures. These features make the NA-50004-6K a dependable choice for top-end engine service and replacement.
Fitment includes the 1998 and 1999 Polaris Big Boss 500 6X6; 1997 Polaris Xplorer 500 4X4; and 2000 through 2006 Polaris Scrambler 500 4X4 models. Verify the model year, engine configuration, piston size, and compression requirements before installation.
Features:
- Complete Top End Kit: Includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit.
- Piston Size: 93.47 mm piston designed for compatible Polaris 500 engine applications.
- Compression Ratio: 11:1 compression configuration for select Polaris 500 models.
- MOS2-Coated Skirts: Teflon and molybdenum coating helps reduce friction, improve heat transfer, and minimize cold-seizure risk.
- Machined Smooth Head: Helps reflect combustion heat and reduce carbon buildup on the piston crown.
- Anodized Dome: Improves heat resistance and piston durability.
- Hypereutectic Construction: Higher silicon content helps reduce expansion, improve wear resistance, and withstand higher cylinder temperatures.
- Fitment: Fits 1998-1999 Polaris Big Boss 500 6X6, 1997 Polaris Xplorer 500 4X4, and 2000-2006 Polaris Scrambler 500 4X4.
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 Scrambler 500 4X4
1999 Polaris Sportsman 500 4X4
2000 Polaris Magnum 500 4X4
2000 Polaris Scrambler 500 4X4
2000 Polaris Sportsman 500 4X4
2001 Polaris Magnum 500 4X4
2001 Polaris Ranger 500 4X4
2001 Polaris Scrambler 500 2X4
2001 Polaris Scrambler 500 4X4
2002 Polaris Magnum 500 2X4
2002 Polaris Magnum 500 4X4
2002 Polaris Ranger 500 4X4
2002 Polaris Scrambler 500 2X4
2002 Polaris Scrambler 500 4X4
2003 Polaris Magnum 500 4X4
2003 Polaris Ranger 500 4X4
2003 Polaris Scrambler 500 4X4
2004 Polaris Atp 500
2004 Polaris Ranger 500 4X4
2004 Polaris Scrambler 500 4X4
2005 Polaris Atp 500
2005 Polaris Ranger 500 2X4
2005 Polaris Ranger 500 4X4
2005 Polaris Scrambler 500 4X4
2006 Polaris Ranger 500 2X4
2006 Polaris Ranger 500 4X4
2006 Polaris Scrambler 500 4X4
2007 Polaris Ranger 500 2X4
2007 Polaris Ranger 500 4X4
2007 Polaris Scrambler 500 4X4
2008 Polaris Ranger 500 2X4
2008 Polaris Scrambler 500 4X4
2009 Polaris Scrambler 500 4X4
2010 Polaris Scrambler 500 4X4
2011 Polaris Scrambler 500 4X4
2012 Polaris Scrambler 500 4X4