The NAMURA NA-10000-6K Top End Kit is designed for select Honda TRX450 Foreman ATVs and includes the essential components for a dependable top-end rebuild. This 91.46 mm (+1.50 mm) kit features an 11:1 compression piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit. It is engineered to support proper fitment and reliable performance when servicing a worn or damaged top end.
Manufactured by NAMURA, the kit uses a hypereutectic casting process that increases silicon content for reduced expansion, improved wear resistance, and greater tolerance of elevated cylinder temperatures. The piston skirts feature a rolled-on MOS2 coating made with Teflon and molybdenum. This bonded coating helps improve heat transfer, reduce friction, and minimize the risk of cold seizures. Machined smooth heads help reflect combustion heat and reduce carbon buildup, while anodized domes improve heat resistance and durability.
Fitment includes 1998–2004 Honda TRX450FE Foreman ES models with SRA and 1998–2000 Honda TRX450FM Foreman S models with SRA. Verify the model, year, bore requirement, and compression specification before installation. This product is identified by manufacturer part number NA-10000-6K and vendor part number 186-1006.
Features:
- Complete top-end kit: Includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit.
- Bore size: 91.46 mm (+1.50 mm) piston specification for compatible Honda TRX450 Foreman applications.
- Compression ratio: 11:1 design supports the specified engine configuration.
- MOS2-coated skirts: Rolled-on Teflon and molybdenum coating helps 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 construction: Higher silicon content helps reduce expansion and improve wear resistance at elevated cylinder temperatures.
- Fitment: Fits 1998–2004 Honda TRX450FE Foreman ES [SRA] and 1998–2000 Honda TRX450FM Foreman S [SRA] models.
- Part numbers: NAMURA manufacturer part number NA-10000-6K; vendor part number 186-1006.
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]