The Namura NA-50003-4 Two-Stroke Piston Kit is designed for select Polaris 300 ATVs and features a 75.47 mm, +1.00 mm oversize piston with an 11:1 compression ratio. This replacement piston kit supports dependable engine rebuilding and is intended for applications requiring the corresponding oversize piston specification.
This kit fits the 1996–1999 Polaris Xpress 300, 1994–1995 Polaris 300 2X4, 1994–1995 Polaris 300 4X4, and 1996–1997 Polaris Xplorer 300 4X4. Always verify the piston size, compression ratio, and engine specifications before installation to ensure proper fitment.
Important: The Namura NA-50003-4 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. The manufacturer part number is NA-50003-4, and the vendor part number is 187-500034.
Features:
- Brand: Namura
- Manufacturer Part Number: NA-50003-4
- Vendor Part Number: 187-500034
- Piston Size: 75.47 mm with +1.00 mm oversize
- Engine Type: Two-stroke
- Compression Ratio: 11:1
- Fitment: 1996–1999 Polaris Xpress 300
- Fitment: 1994–1995 Polaris 300 2X4
- Fitment: 1994–1995 Polaris 300 4X4
- Fitment: 1996–1997 Polaris Xplorer 300 4X4
- Compatibility: Does not accept OEM piston rings, and 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