The NAMURA NA-10090K Top End Kit is a complete standard-bore replacement solution for select Honda TRX90-series sport ATVs. Designed for reliable top-end service, this kit includes a piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit. Its 9.2:1 compression specification supports dependable operation while maintaining compatibility with the original engine configuration.
Designed for durability and consistent performance, the piston features MOS2 Teflon and molybdenum-coated skirts. This rolled-on coating process creates a strong bonded surface that helps reduce friction, improve heat transfer, and minimize the risk of cold seizures. The machined smooth head helps reflect combustion heat and reduce carbon buildup, while the anodized dome enhances heat resistance and durability. NAMURA also uses a hypereutectic casting process with increased silicon content to limit expansion, improve wear resistance, and withstand elevated cylinder temperatures.
This NAMURA top-end kit fits 1993 and 1994 Honda TRX90 Sportrax models, 2007 and 2008 Honda TRX90EX Sportrax models, and 2009, 2012, 2013, 2014, 2015, and 2016 Honda TRX90X models with SRA designation. Verify the model year, engine configuration, and existing bore specification before installation. The manufacturer part number and vendor part number are both NA-10090K.
Features:
- Complete top-end kit includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit
- Standard-bore piston with a 46.97 mm size and 9.2:1 compression ratio
- MOS2 Teflon and molybdenum-coated skirts help reduce friction, improve heat transfer, and minimize cold-seizure risk
- Machined smooth piston head helps reflect combustion heat and reduce carbon buildup
- Anodized dome improves heat resistance and piston durability
- Hypereutectic casting process provides reduced expansion, increased wear resistance, and improved high-temperature performance
- Fits select 1993–1994 Honda TRX90 Sportrax, 2007–2008 Honda TRX90EX Sportrax, and 2009, 2012–2016 Honda TRX90X SRA models
- Brand: NAMURA; Manufacturer and vendor part number: NA-10090K
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]
2010 Honda TRX90X [SRA]
2011 Honda TRX90X [SRA]
2012 Honda TRX90X [SRA]
2013 Honda TRX90X [SRA]
2014 Honda TRX90X [SRA]
2015 Honda TRX90X [SRA]
2016 Honda TRX90X [SRA]
2017 Honda TRX90X [SRA]
2018 Honda TRX90X [SRA]
2019 Honda TRX90X [SRA]
2020 Honda TRX90X [SRA]
2021 Honda TRX90X [SRA]
2022 Honda TRX90X [SRA]
2023 Honda TRX90X [SRA]