The Namura NA-10046K Top End Kit is designed for select Honda TRX450R and TRX450ER sport ATVs with electric start. This standard-bore kit includes a piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit for a comprehensive upper-engine rebuild. It fits 2006–2009 and 2012–2014 Honda TRX450ER Electric Start models, along with 2006–2008 Honda TRX450R models. Verify the model year and engine configuration before installation.
The piston uses a hypereutectic casting process that increases silicon content to help control expansion, improve wear resistance, and withstand elevated cylinder temperatures. Its MOS2, or Teflon and molybdenum, coated skirts use a rolled-on application for a durable bond that helps reduce friction, improve heat transfer, and minimize the risk of cold seizures. The machined smooth head is designed to reflect combustion heat and reduce carbon buildup, helping protect the piston crown and support consistent engine performance.
An anodized dome improves heat resistance and durability compared with a non-anodized design. With a 95.96 mm standard-bore piston and an 11:1 compression ratio, the Namura NA-10046K kit is suited for restoring dependable top-end function on compatible Honda ATV engines. The included gasket kit and supporting components simplify the rebuild process while helping ensure proper fit and sealing. Manufacturer part number NA-10046K and vendor part number 186-1046 identify this Namura replacement top-end kit.
Features:
- Complete top-end kit includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit
- 95.96 mm standard-bore piston with an 11:1 compression ratio for compatible Honda TRX450R and TRX450ER engines
- MOS2 Teflon and molybdenum coated piston 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 piston dome improves heat resistance and durability
- Hypereutectic casting process provides controlled expansion, increased wear resistance, and improved high-temperature performance
- Fits 2006–2009 and 2012–2014 Honda TRX450ER Electric Start models and 2006–2008 Honda TRX450R models
- Brand: Namura; manufacturer part number: NA-10046K; vendor part number: 186-1046
Fitment:
2006 Honda TRX450ER Electric Start
2006 Honda TRX450R
2007 Honda TRX450ER Electric Start
2007 Honda TRX450R
2008 Honda TRX450ER Electric Start
2008 Honda TRX450R
2009 Honda TRX450ER Electric Start
2009 Honda TRX450R
2012 Honda TRX450ER Electric Start
2012 Honda TRX450R
2013 Honda TRX450ER Electric Start
2013 Honda TRX450R
2014 Honda TRX450ER Electric Start
2014 Honda TRX450R