The Namura NA-50003 Two-Stroke Piston Kit is a standard-size replacement piston assembly designed for select Polaris 300 ATV applications. This kit features a 74.47 mm piston diameter and an 11:1 compression ratio, providing a reliable replacement option for worn or damaged original components. It is intended for use with the specified Polaris Xpress, Xplorer, and 300 2X4 and 4X4 models.
Fitment includes the 1996–1999 Polaris Xpress 300, 1994–1995 Polaris 300 2X4, 1994–1995 Polaris 300 4X4, and 1996–1997 Polaris Xplorer 300 4X4. Verify the model year, engine configuration, bore specification, and piston requirements before installation to ensure proper application.
Important: The Namura NA-50003 piston kit will not accept OEM piston rings, and its rings will not work with an OEM piston. Use the rings supplied or specified for this Namura piston kit, and follow the manufacturer’s installation and clearance recommendations. The manufacturer is Namura, and the vendor part number is NA-50003.
Features:
- Size: Standard 74.47 mm piston diameter
- Model: Two-stroke piston kit with an 11:1 compression ratio
- Brand: Namura
- Manufacturer Part Number: NA-50003
- Vendor Part Number: NA-50003
- Fitment: Fits 1996–1999 Polaris Xpress 300 models
- Fitment: Fits 1994–1995 Polaris 300 2X4 and 4X4 models
- Fitment: Fits 1996–1997 Polaris Xplorer 300 4X4 models
- Compatibility: Does not accept OEM piston rings, and the supplied rings are not compatible with an OEM piston
Fitment:
1994 Polaris 300 2X4
1994 Polaris 300 4X4
1995 Polaris 300 2X4
1995 Polaris 300 4X4
1996 Polaris Xplorer 300 4X4
1996 Polaris Xpress 300
1997 Polaris Xplorer 300 4X4
1997 Polaris Xpress 300
1998 Polaris Xplorer 300 4X4
1998 Polaris Xpress 300
1999 Polaris Xplorer 300 4X4
1999 Polaris Xpress 300