The Namura NA-50000-6 Piston Kit is designed for select Polaris 250 ATV applications requiring a 73.46 mm piston with a +1.50 mm oversize specification. This replacement piston kit is manufactured by Namura and is identified by manufacturer part number NA-50000-6 and vendor part number NA-50000-6. It is engineered for dependable fit and service in compatible Polaris engine assemblies.
Fitment includes the 1991 and 1992 Polaris Big Boss 250 6X6, along with the 1988 through 1993 Polaris Trail Boss 250 2X4 and the 1989 and 1990 Polaris Trail Boss 250 4X4. Verify the vehicle year, model, engine configuration, and required piston size before installation to ensure compatibility with the application.
Important: The Namura NA-50000-6 piston kit will not accept OEM 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, clearance, and break-in recommendations. Proper cylinder preparation and accurate measurement are essential for reliable performance and service life.
Features:
- Size: 73.46 mm piston with +1.50 mm oversize specification
- Model: Piston Kit 73.46/+1.50 for compatible Polaris 250 applications
- Brand: Namura
- Manufacturer Part Number: NA-50000-6
- Vendor Part Number: NA-50000-6
- Fitment: 1991-1992 Polaris Big Boss 250 6X6
- Fitment: 1988-1993 Polaris Trail Boss 250 2X4
- Fitment: 1989-1990 Polaris Trail Boss 250 4X4
- Compatibility: Does not accept OEM rings; supplied rings are not compatible with an OEM piston
Fitment:
1985 Polaris Trail Boss 250 2X4
1986 Polaris Trail Boss 250 2X4
1987 Polaris Trail Boss 250 2X4
1987 Polaris Trail Boss 250 4X4
1988 Polaris Trail Boss 250 2X4
1988 Polaris Trail Boss 250 4X4
1988 Polaris Trail Boss 250R/Es
1989 Polaris Big Boss 250 4X6
1989 Polaris Trail Boss 250 2X4
1989 Polaris Trail Boss 250 4X4
1990 Polaris Big Boss 250 4X6
1990 Polaris Trail Blazer 250
1990 Polaris Trail Boss 250 2X4
1990 Polaris Trail Boss 250 4X4
1991 Polaris Big Boss 250 4X6
1991 Polaris Big Boss 250 6X6
1991 Polaris Trail Blazer 250
1991 Polaris Trail Boss 250 2X4
1991 Polaris Trail Boss 250 4X4
1992 Polaris Big Boss 250 4X6
1992 Polaris Big Boss 250 6X6
1992 Polaris Trail Blazer 250
1992 Polaris Trail Boss 250 2X4
1992 Polaris Trail Boss 250 4X4
1993 Polaris Trail Blazer 250
1993 Polaris Trail Boss 250 2X4
1993 Polaris Trail Boss 250 4X4
1994 Polaris Trail Blazer 250
1994 Polaris Trail Boss 250 2X4
1995 Polaris Trail Blazer 250
1995 Polaris Trail Boss 250 2X4
1996 Polaris Trail Blazer 250
1996 Polaris Trail Boss 250 2X4
1997 Polaris Trail Blazer 250
1997 Polaris Trail Boss 250 2X4
1998 Polaris Trail Blazer 250
1998 Polaris Trail Boss 250 2X4
1999 Polaris Trail Blazer 250
1999 Polaris Trail Boss 250 2X4
2000 Polaris Trail Blazer 250
2000 Polaris Xplorer 250 4X4
2001 Polaris Trail Blazer 250
2001 Polaris Xplorer 250 4X4
2002 Polaris Trail Blazer 250
2002 Polaris Xplorer 250 4X4
2003 Polaris Trail Blazer 250
2004 Polaris Trail Blazer 250
2005 Polaris Trail Blazer 250
2006 Polaris Trail Blazer 250