Restore top-end performance with the NAMURA NA-10000-2K Top End Kit, designed for select Honda TRX450 Foreman ATVs. This 90.46 mm, 11:1 compression kit includes the piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit required for a comprehensive top-end rebuild. The +0.50 mm overbore specification is intended for compatible applications requiring cylinder preparation by a qualified technician.
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/molybdenum, coated skirts use a rolled-on application process for a strong coating bond. This treatment helps improve heat transfer, reduce friction, and minimize the possibility of cold seizures during operation.
Additional piston features include machined smooth heads that help reflect combustion heat and reduce carbon buildup, along with anodized domes engineered to improve heat resistance and durability. Together, these design elements support dependable operation and consistent performance in demanding ATV conditions.
The NAMURA NA-10000-2K fits 1998–2004 Honda TRX450FE Foreman ES models with SRA and 1998–2000 Honda TRX450FM Foreman S models with SRA. Confirm the model, year, bore requirement, compression ratio, and cylinder specifications before installation. This product is identified by manufacturer part number NA-10000-2K and vendor part number 186-10002.
Features:
- Complete top-end kit includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit
- 90.46 mm piston with +0.50 mm overbore specification and 11:1 compression ratio
- MOS2 Teflon/molybdenum-coated skirts help reduce friction, improve heat transfer, and minimize cold-seizure risk
- Machined smooth head helps reflect combustion heat and reduce carbon buildup
- Anodized dome improves heat resistance and piston durability
- Hypereutectic casting process provides controlled expansion, wear resistance, and high-temperature strength
- Fitment: 1998–2004 Honda TRX450FE Foreman ES with SRA and 1998–2000 Honda TRX450FM Foreman S with SRA
- Manufacturer Part Number: NA-10000-2K
- Vendor Part Number: 186-10002
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]