The NAMURA NA-10012-4K Top End Kit is designed for select Honda 680cc powersports applications requiring a reliable replacement piston assembly. This kit includes the piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit for a convenient and comprehensive top-end rebuild. The piston uses a hypereutectic casting process that increases silicon content, helping reduce expansion, improve wear resistance, and withstand elevated cylinder temperatures.
Feature: The piston skirts feature a MOS2 coating made with Teflon and molybdenum. The rolled-on application creates a stronger bond than conventional spray-on coatings, helping improve heat transfer, reduce friction, and minimize the risk of cold seizures. The machined-smooth piston head helps reflect combustion heat and reduce carbon buildup, supporting piston protection and efficient engine operation.
Feature: The anodized dome improves heat resistance and durability, while providing greater strength than a non-anodized piston dome. The kit is specified with an approximately 102.97 mm piston and an 11:1 compression ratio. It is intended for fitment on the 2014–2016 Honda SXS700M2 Pioneer 700, 2010–2013 Honda MUV700 Big Red, and 2006–2008 Honda TRX680FA Rincon with independent rear suspension. Verify the vehicle model, year, engine configuration, and bore specification before installation.
Manufactured by NAMURA, this top-end kit is supplied under manufacturer part number NA-10012-4K and vendor part number 186-10124. It provides the matched components needed to service the piston area while helping restore dependable compression and engine performance.
Features:
- Complete top-end kit includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit
- Approximately 102.97 mm piston with an 11:1 compression ratio
- MOS2 Teflon and molybdenum-coated skirts help reduce friction, improve heat transfer, and reduce cold-seizure risk
- Machined-smooth piston head helps reflect combustion heat and limit carbon buildup
- Anodized dome improves heat resistance, durability, and piston strength
- Hypereutectic casting provides reduced expansion, increased wear resistance, and improved high-temperature durability
- Fits select Honda SXS700M2 Pioneer 700, MUV700 Big Red, and TRX680FA Rincon models
- Brand: NAMURA
- Manufacturer part number: NA-10012-4K
- Vendor part number: 186-10124
Fitment:
2006 Honda TRX680FA Rincon [IRS]
2007 Honda TRX680FA Rincon [IRS]
2008 Honda TRX680FA Rincon [IRS]
2009 Honda TRX680FA Rincon [IRS]
2010 Honda Muv700 Big Red
2010 Honda TRX680FA Rincon [IRS]
2011 Honda Muv700 Big Red
2011 Honda TRX680FA Rincon [IRS]
2012 Honda Muv700 Big Red
2012 Honda TRX680FA Rincon [IRS]
2013 Honda Muv700 Big Red
2013 Honda TRX680FA Rincon [IRS]
2014 Honda SXS700M2 Pioneer 700
2014 Honda TRX680FA Rincon [IRS]
2015 Honda SXS700M2 Pioneer 700
2015 Honda TRX680FA Rincon [IRS]
2016 Honda SXS700M2 Pioneer 700
2016 Honda TRX680FA Rincon [IRS]
2017 Honda SXS700M2 Pioneer 700
2017 Honda TRX680FA Rincon [IRS]
2023 Honda SXS700M2 Pioneer 700
2023 Honda TRX680FA Rincon [IRS]