The Namura NA-10003 High-Compression Piston Kit is designed for select Honda sport ATV applications, including the TRX400X and TRX400EX Sportrax. This standard-bore piston kit features an 11:1 compression ratio and is manufactured to support reliable engine performance in compatible 400cc Honda engines. The kit is intended for riders and technicians seeking a replacement piston matched to the original bore specification.
Fitment: Fits 2012-2014 Honda TRX400X and 1999-2005 Honda TRX400EX Sportrax models. Verify the model year and engine configuration before installation to ensure proper application. The Namura manufacturer part number and vendor part number are both NA-10003.
Important compatibility information: This piston kit will not accept OEM piston rings, and the included or compatible rings will not work on an OEM piston. Replace the piston and rings as a matched set according to the application requirements. Professional installation and careful inspection of the cylinder, wrist pin, circlips, and related components are recommended before engine assembly.
Features:
- Brand: Namura
- Manufacturer Part Number: NA-10003
- Vendor Part Number: NA-10003
- Product Type: High-compression piston kit
- Bore Size: 84.97 mm standard bore
- Compression Ratio: 11:1
- Fitment: 2012-2014 Honda TRX400X
- Fitment: 1999-2005 Honda TRX400EX Sportrax
- Compatibility: Will not accept OEM piston rings, and the rings will not work on an OEM piston
Fitment:
1996 Honda XR400R
1997 Honda XR400R
1998 Honda XR400R
1999 Honda TRX400EX Sportrax
1999 Honda XR400R
2000 Honda TRX400EX Sportrax
2000 Honda XR400R
2001 Honda TRX400EX Sportrax
2001 Honda XR400R
2002 Honda TRX400EX Sportrax
2002 Honda XR400R
2003 Honda TRX400EX Sportrax
2003 Honda XR400R
2004 Honda TRX400EX Sportrax
2004 Honda XR400R
2005 Honda TRX400EX Sportrax
2006 Honda TRX400EX Sportrax
2007 Honda TRX400EX Sportrax
2008 Honda TRX400EX Sportrax
2009 Honda TRX400X
2012 Honda TRX400X
2013 Honda TRX400X
2014 Honda TRX400X