Restore the top-end performance of your ATV with the Namura NA-10042-2K Top End Kit. Designed for select 2007–2008 Honda Rancher models, this kit includes the essential components needed for a complete top-end rebuild: piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit. The 86.98 mm +0.50 mm piston size and 11:1 compression ratio are engineered for compatible oversize-cylinder applications.
The piston features Namura’s MOS2 Teflon/molybdenum-coated skirts. This rolled-on coating process creates a durable bond while helping reduce friction, improve heat transfer, and minimize the risk of cold seizures. The machined smooth head reflects combustion heat and helps reduce carbon buildup, supporting piston protection and consistent engine operation. An anodized dome further improves heat resistance and durability compared with non-anodized piston designs.
Manufactured using a hypereutectic casting process, the piston contains increased silicon content to help control expansion, improve wear resistance, and withstand higher cylinder temperatures. The Namura NA-10042-2K kit is a practical replacement solution for rebuilding compatible Honda Rancher engines and is intended for professional installation with proper cylinder inspection and machining.
Fitment: 2007–2008 Honda TRX420FE Rancher ES [SRA], 2007–2008 Honda TRX420FM Rancher [SRA], 2007–2008 Honda TRX420TE Rancher 2x4 ES [SRA], and 2007–2008 Honda TRX420TM Rancher [SRA]. Verify the engine configuration and required piston oversize before installation.
Features:
- Complete top-end kit includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit
- 86.98 mm +0.50 mm piston size with an 11:1 compression ratio for compatible oversize-cylinder applications
- 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 piston dome improves heat resistance and durability
- Hypereutectic casting process provides controlled expansion, added wear resistance, and improved high-temperature performance
- Fits select 2007–2008 Honda TRX420FE, TRX420FM, TRX420TE, and TRX420TM Rancher models
Fitment:
2007 Honda TRX420FE Rancher ES [SRA]
2007 Honda TRX420FM Rancher [SRA]
2007 Honda TRX420TE Rancher 2x4 ES [SRA]
2007 Honda TRX420TM Rancher [SRA]
2008 Honda TRX420FE Rancher ES [SRA]
2008 Honda TRX420FM Rancher [SRA]
2008 Honda TRX420TE Rancher 2x4 ES [SRA]
2008 Honda TRX420TM Rancher [SRA]