Restore top-end performance on your Honda TRX300 Fourtrax with the Namura NA-10002K Top End Kit. Designed for the 73.95 mm standard-bore application with an 11:1 compression ratio, this kit includes the essential components needed for a complete top-end rebuild, including a piston, piston rings, wrist pin, circlips, top-end bearing, and gasket kit.
The piston features a MOS2, or Teflon and molybdenum, coated skirt applied through a rolled-on process for a bond reported to be 10 times stronger than many spray-on coatings. This coating helps promote heat transfer, reduce friction, and minimize the risk of cold seizures. The machined smooth head reflects combustion heat and helps reduce carbon buildup, supporting piston protection and efficient engine operation.
An anodized dome improves heat resistance and durability, while the hypereutectic casting process increases silicon content to reduce expansion and improve wear resistance. These features help the piston withstand elevated cylinder temperatures while maintaining dependable service in demanding riding conditions. The Namura manufacturer part number is NA-10002K, and the vendor part number is 186-1002.
Fitment: This Namura top-end kit fits 1988–1997 Honda TRX300 Fourtrax models. Verify the year, model, bore size, compression ratio, and engine specifications before ordering to ensure proper installation.
Features:
- Complete top-end kit includes piston, rings, wrist pin, circlips, top-end bearing, and gasket kit
- 73.95 mm standard-bore piston with an 11:1 compression ratio for compatible Honda TRX300 Fourtrax applications
- MOS2 Teflon and molybdenum coated skirt helps 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 increased silicon content, reduced expansion, and enhanced wear resistance
- Fits 1988–1997 Honda TRX300 Fourtrax models
- Brand: Namura; manufacturer part number: NA-10002K; vendor part number: 186-1002
Fitment:
1988 Honda TRX300 Fourtrax
1988 Honda TRX300FW Fourtrax 4X4
1989 Honda TRX300 Fourtrax
1990 Honda TRX300 Fourtrax
1990 Honda TRX300FW Fourtrax 4X4
1991 Honda TRX300 Fourtrax
1991 Honda TRX300FW Fourtrax 4X4
1992 Honda TRX300 Fourtrax
1992 Honda TRX300FW Fourtrax 4X4
1993 Honda TRX300 Fourtrax
1993 Honda TRX300FW Fourtrax 4X4
1994 Honda TRX300 Fourtrax
1994 Honda TRX300FW Fourtrax 4X4
1995 Honda TRX300 Fourtrax
1995 Honda TRX300FW Fourtrax 4X4
1996 Honda TRX300 Fourtrax
1996 Honda TRX300FW Fourtrax 4X4
1997 Honda TRX300 Fourtrax
1997 Honda TRX300FW Fourtrax 4X4
1998 Honda TRX300 Fourtrax
1998 Honda TRX300FW Fourtrax 4X4
1999 Honda TRX300 Fourtrax
1999 Honda TRX300FW Fourtrax 4X4
2000 Honda TRX300 Fourtrax
2000 Honda TRX300FW Fourtrax 4X4