The Namura NA-10000K Top End Kit is a standard-bore engine rebuild kit designed for select Honda TRX450 Foreman models. This 89.96 mm piston kit features an 11:1 compression ratio and includes the piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit needed for a dependable top-end service.
Built using Namura's hypereutectic casting process, the piston offers increased silicon content to help control expansion, improve wear resistance, and withstand elevated cylinder temperatures. The MOS2, or Teflon/molybdenum, coated skirts use a rolled-on application process that creates a strong bond while helping reduce friction, improve heat transfer, and minimize the risk of cold seizures.
The piston also features a machined smooth head to reflect combustion heat and help reduce carbon buildup. Its anodized dome improves heat resistance and durability, while providing greater strength than a non-anodized dome. These design features support consistent engine performance and long-term reliability when installed with the correct clearances, procedures, and related components.
This Namura top-end kit fits 1998 through 2004 Honda TRX450FE Foreman ES models with SRA and 1998 through 2000 Honda TRX450FM Foreman S models with SRA. Verify the model year, engine specifications, bore size, and manufacturer fitment information before installation. Manufacturer part number: NA-10000K. Vendor part number: 186-1000.
Features:
- Complete top-end kit includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit
- 89.96 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 improves heat resistance and durability
- Hypereutectic casting process provides controlled expansion, increased wear resistance, and improved high-temperature performance
- Fits select 1998-2004 Honda TRX450FE Foreman ES SRA models and 1998-2000 Honda TRX450FM Foreman S SRA models
- Brand: Namura
- Manufacturer part number: NA-10000K
- Vendor part number: 186-1000
Fitment:
1998 Honda TRX450FE Foreman ES [SRA]
1998 Honda TRX450FM Foreman S [SRA]
1999 Honda TRX450FE Foreman ES [SRA]
1999 Honda TRX450FM Foreman S [SRA]
2000 Honda TRX450FE Foreman ES [SRA]
2000 Honda TRX450FM Foreman S [SRA]
2001 Honda TRX450FE Foreman ES [SRA]
2001 Honda TRX450FM Foreman S [SRA]
2002 Honda TRX450FE Foreman ES [SRA]
2002 Honda TRX450FM Foreman S [SRA]
2003 Honda TRX450FE Foreman ES [SRA]
2003 Honda TRX450FM Foreman S [SRA]
2004 Honda TRX450FE Foreman ES [SRA]
2004 Honda TRX450FM Foreman S [SRA]