The Namura NA-10090-2K Top End Kit is designed to restore dependable performance and compression in select Honda TRX90 Sportrax and TRX90X engines. This complete kit includes a piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit for a convenient top-end rebuild. The 47.47 mm piston size and 9.2:1 compression ratio are engineered for compatible applications requiring a 0.020-inch oversize replacement.
The piston features MOS2, or Teflon and molybdenum, coated skirts applied through a rolled-on process designed to provide a strong, durable bond. This coating helps reduce friction, improve heat transfer, and minimize the risk of cold seizures. Machined smooth heads help reflect combustion heat and reduce carbon buildup, while anodized domes improve heat resistance and durability.
Namura uses a hypereutectic casting process to provide increased silicon content, reduced expansion, improved wear resistance, and reliable performance under elevated cylinder temperatures. The kit is intended for select 1993–1994 Honda TRX90 Sportrax, 2007–2008 Honda TRX90EX Sportrax, and 2009, 2012–2016 Honda TRX90X models. Confirm the model year, engine specifications, and required oversize before installation. Manufacturer part number: NA-10090-2K. Vendor part number: 186-10902.
Features:
- Complete top-end kit: Includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit
- 47.47 mm piston size: Provides a 0.020-inch oversize replacement for compatible Honda TRX90 applications
- 9.2:1 compression ratio: Matches the specified engine configuration for dependable top-end performance
- MOS2-coated skirts: Helps reduce friction, improve heat transfer, and minimize cold-seizure risk
- Machined smooth head: Reflects combustion heat and helps reduce carbon buildup
- Anodized dome: Improves heat resistance and piston durability
- Hypereutectic casting: Provides reduced expansion, increased wear resistance, and improved high-temperature performance
- Fitment: Fits select 1993–1994 Honda TRX90 Sportrax, 2007–2008 Honda TRX90EX Sportrax, and 2009, 2012–2016 Honda TRX90X models
- Brand: Namura
- Manufacturer part number: NA-10090-2K
- Vendor part number: 186-10902
Fitment:
1993 Honda TRX90 Sportrax
1994 Honda TRX90 Sportrax
1995 Honda TRX90 Sportrax
1996 Honda TRX90 Sportrax
1997 Honda TRX90 Sportrax
1998 Honda TRX90 Sportrax
1999 Honda TRX90 Sportrax
2000 Honda TRX90 Sportrax
2001 Honda TRX90 Sportrax
2002 Honda TRX90 Sportrax
2003 Honda TRX90 Sportrax
2004 Honda TRX90 Sportrax
2005 Honda TRX90 Sportrax
2006 Honda TRX90 Sportrax
2007 Honda TRX90EX Sportrax
2008 Honda TRX90EX Sportrax
2009 Honda TRX90X [SRA]
2012 Honda TRX90X [SRA]
2013 Honda TRX90X [SRA]
2014 Honda TRX90X [SRA]
2015 Honda TRX90X [SRA]
2016 Honda TRX90X [SRA]
2023 Honda TRX90X [SRA]