The NAMURA NA-10043K Top End Kit is a complete engine rebuild solution for select Honda Rancher 4x4 AT, DCT, EPS, and ES models from 2014 through 2017. Designed with an 86.48 mm standard-bore piston and an 11:1 compression ratio, this kit helps restore dependable top-end performance and provides the components needed for a proper piston replacement.
The kit includes a piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit. The piston uses a hypereutectic casting process with increased silicon content to help control expansion, improve wear resistance, and withstand elevated cylinder temperatures. Its machined-smooth head reflects combustion heat and helps reduce carbon buildup, while the anodized dome improves heat resistance and durability.
Feature: MOS2 Teflon/molybdenum-coated skirts use a rolled-on application process for a stronger bond than spray-on coatings. This coating helps improve heat transfer, reduce friction, and minimize the risk of cold seizures. Feature: Complete top-end configuration includes the primary piston and installation components required for the applicable repair. Feature: Standard-bore design supports direct replacement applications when the cylinder remains within the manufacturer’s standard specifications.
This NAMURA top-end kit fits 2014–2016 Honda TRX420FA1 Rancher 4x4 AT DCT models, 2014–2017 Honda TRX420FA2 Rancher 4x4 AT DCT EPS models, and 2014–2016 Honda TRX420FE1 Rancher 4x4 ES models, all with SRA configurations. Verify the exact vehicle model, year, engine specifications, and cylinder condition before installation. Manufacturer part number: NA-10043K. Vendor part number: 186-1043.
Features:
- Complete top-end kit includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit
- 86.48 mm standard-bore piston with an 11:1 compression ratio
- MOS2 Teflon/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 increases heat resistance and piston durability
- Hypereutectic casting process provides controlled expansion and increased wear resistance
- Fits select 2014–2017 Honda Rancher TRX420FA1, TRX420FA2, and TRX420FE1 SRA models
- Manufacturer part number: NA-10043K; vendor part number: 186-1043
Fitment:
2009 Honda TRX420FA Rancher AT [IRS]
2009 Honda TRX420FE Rancher ES [SRA]
2009 Honda TRX420FM Rancher [SRA]
2009 Honda TRX420FPA Rancher w/PS [IRS]
2009 Honda TRX420FPE Rancher ES w/PS [SRA]
2009 Honda TRX420FPM Rancher w/PS [SRA]
2009 Honda TRX420TE Rancher 2x4 ES [SRA]
2009 Honda TRX420TM Rancher [SRA]
2010 Honda TRX420FA Rancher AT [IRS]
2010 Honda TRX420FE Rancher ES [SRA]
2010 Honda TRX420FM Rancher [SRA]
2010 Honda TRX420FPA Rancher w/PS [IRS]
2010 Honda TRX420FPE Rancher ES w/PS [SRA]
2010 Honda TRX420FPM Rancher w/PS [SRA]
2010 Honda TRX420TE Rancher 2x4 ES [SRA]
2010 Honda TRX420TM Rancher [SRA]
2011 Honda TRX420FA Rancher AT [IRS]
2011 Honda TRX420FE Rancher ES [SRA]
2011 Honda TRX420FM Rancher [SRA]
2011 Honda TRX420FPA Rancher w/PS [IRS]
2011 Honda TRX420FPE Rancher ES w/PS [SRA]
2011 Honda TRX420FPM Rancher w/PS [SRA]
2011 Honda TRX420TE Rancher 2x4 ES [SRA]
2011 Honda TRX420TM Rancher [SRA]
2012 Honda TRX420FA Rancher AT [IRS]
2012 Honda TRX420FE Rancher ES [SRA]
2012 Honda TRX420FM Rancher [SRA]
2012 Honda TRX420FPA Rancher w/PS [IRS]
2012 Honda TRX420FPE Rancher ES w/PS [SRA]
2012 Honda TRX420FPM Rancher w/PS [SRA]
2012 Honda TRX420TE Rancher 2x4 ES [SRA]
2012 Honda TRX420TM Rancher [SRA]
2013 Honda TRX420FA Rancher AT [IRS]
2013 Honda TRX420FE Rancher ES [SRA]
2013 Honda TRX420FM Rancher [SRA]
2013 Honda TRX420FPA Rancher w/PS [IRS]
2013 Honda TRX420FPE Rancher ES w/PS [SRA]
2013 Honda TRX420FPM Rancher w/PS [SRA]
2013 Honda TRX420TE Rancher 2x4 ES [SRA]
2013 Honda TRX420TM Rancher [SRA]
2014 Honda TRX420FA Rancher AT [IRS]
2014 Honda TRX420FA1 Rancher 4x4 AT DCT [SRA]
2014 Honda TRX420FA2 Rancher 4x4 AT DCT EPS [SRA]
2014 Honda TRX420FE1 Rancher 4x4 ES [SRA]
2014 Honda TRX420FM1 Rancher 4x4 [SRA]
2014 Honda TRX420FM2 Rancher 4x4 EPS [SRA]
2014 Honda TRX420FPA Rancher w/PS [IRS]
2014 Honda TRX420TE1 Rancher 2x4 ES [SRA]
2014 Honda TRX420TM1 Rancher [SRA]
2015 Honda TRX420FA1 Rancher 4x4 AT DCT [SRA]
2015 Honda TRX420FA2 Rancher 4x4 AT DCT EPS [SRA]
2015 Honda TRX420FA5 Rancher 4x4 AT DCT [IRS]
2015 Honda TRX420FA6 Rancher 4x4 AT DCT EPS [IRS]
2015 Honda TRX420FE1 Rancher 4x4 ES [SRA]
2015 Honda TRX420FM1 Rancher 4x4 [SRA]
2015 Honda TRX420FM2 Rancher 4x4 EPS [SRA]
2015 Honda TRX420TE1 Rancher 2x4 ES [SRA]
2015 Honda TRX420TM1 Rancher [SRA]
2016 Honda TRX420FA1 Rancher 4x4 AT DCT [SRA]
2016 Honda TRX420FA2 Rancher 4x4 AT DCT EPS [SRA]
2016 Honda TRX420FA5 Rancher 4x4 AT DCT [IRS]
2016 Honda TRX420FA6 Rancher 4x4 AT DCT EPS [IRS]
2016 Honda TRX420FE1 Rancher 4x4 ES [SRA]
2016 Honda TRX420FM1 Rancher 4x4 [SRA]
2016 Honda TRX420FM2 Rancher 4x4 EPS [SRA]
2016 Honda TRX420TE1 Rancher 2x4 ES [SRA]
2016 Honda TRX420TM1 Rancher [SRA]
2017 Honda TRX420FA2 Rancher 4x4 AT DCT EPS [SRA]
2017 Honda TRX420FA5 Rancher 4x4 AT DCT [IRS]
2017 Honda TRX420FA6 Rancher 4x4 AT DCT EPS [IRS]
2017 Honda TRX420FE1 Rancher 4x4 ES [SRA]
2017 Honda TRX420FM1 Rancher 4x4 [SRA]
2017 Honda TRX420TM1 Rancher [SRA]
2018 Honda TRX420FA2 Rancher 4x4 AT DCT EPS [SRA]
2018 Honda TRX420FA5 Rancher 4x4 AT DCT [IRS]
2018 Honda TRX420FA6 Rancher 4x4 AT DCT EPS [IRS]
2018 Honda TRX420FE1 Rancher 4x4 ES [SRA]
2018 Honda TRX420FM1 Rancher 4x4 [SRA]
2018 Honda TRX420TM1 Rancher [SRA]
2019 Honda TRX420FA2 Rancher 4x4 AT DCT EPS [SRA]
2019 Honda TRX420FA5 Rancher 4x4 AT DCT [IRS]
2019 Honda TRX420FA6 Rancher 4x4 AT DCT EPS [IRS]
2019 Honda TRX420FE1 Rancher 4x4 ES [SRA]
2019 Honda TRX420FM1 Rancher 4x4 [SRA]
2019 Honda TRX420TM1 Rancher [SRA]
2020 Honda TRX420FA2 Rancher 4x4 AT DCT EPS [SRA]
2020 Honda TRX420FA5 Rancher 4x4 AT DCT [IRS]
2020 Honda TRX420FA6 Rancher 4x4 AT DCT EPS [IRS]
2020 Honda TRX420FE Rancher ES [IRS]
2020 Honda TRX420FE1 Rancher 4x4 ES [SRA]
2020 Honda TRX420FM1 Rancher 4x4 [SRA]
2020 Honda TRX420FM2 Rancher 4x4 EPS [SRA]
2020 Honda TRX420TM1 Rancher [SRA]
2021 Honda TRX420FA2 Rancher 4x4 AT DCT EPS [SRA]
2021 Honda TRX420FA5 Rancher 4x4 AT DCT [IRS]
2021 Honda TRX420FA6 Rancher 4x4 AT DCT EPS [IRS]
2021 Honda TRX420FE Rancher ES [IRS]
2021 Honda TRX420FE1 Rancher 4x4 ES [SRA]
2021 Honda TRX420FM1 Rancher 4x4 [SRA]
2021 Honda TRX420FM2 Rancher 4x4 EPS [SRA]
2021 Honda TRX420TE1 Rancher 2x4 ES [SRA]
2021 Honda TRX420TM1 Rancher [SRA]
2022 Honda TRX420FA2 Rancher 4x4 AT DCT EPS [SRA]
2022 Honda TRX420FA5 Rancher 4x4 AT DCT [IRS]
2022 Honda TRX420FA6 Rancher 4x4 AT DCT EPS [IRS]
2022 Honda TRX420FE1 Rancher 4x4 ES [SRA]
2022 Honda TRX420FM1 Rancher 4x4 [SRA]
2022 Honda TRX420FM2 Rancher 4x4 EPS [SRA]
2022 Honda TRX420TE1 Rancher 2x4 ES [SRA]
2022 Honda TRX420TM1 Rancher [SRA]
2023 Honda TRX420FA2 Rancher 4x4 AT DCT EPS [SRA]
2023 Honda TRX420FA5 Rancher 4x4 AT DCT [IRS]
2023 Honda TRX420FA6 Rancher 4x4 AT DCT EPS [IRS]
2023 Honda TRX420FE1 Rancher 4x4 ES [SRA]
2023 Honda TRX420FM1 Rancher 4x4 [SRA]
2023 Honda TRX420FM2 Rancher 4x4 EPS [SRA]
2023 Honda TRX420TE1 Rancher 2x4 ES [SRA]
2023 Honda TRX420TM1 Rancher [SRA]
2024 Honda TRX420FA2 Rancher 4x4 AT DCT EPS [SRA]
2024 Honda TRX420FA5 Rancher 4x4 AT DCT [IRS]
2024 Honda TRX420FA6 Rancher 4x4 AT DCT EPS [IRS]
2024 Honda TRX420FE1 Rancher 4x4 ES [SRA]
2024 Honda TRX420FM1 Rancher 4x4 [SRA]
2024 Honda TRX420FM2 Rancher 4x4 EPS [SRA]
2024 Honda TRX420TE1 Rancher 2x4 ES [SRA]
2024 Honda TRX420TM1 Rancher [SRA]