The Namura NA-10005-2K top end kit is designed for 1993–2002 Honda TRX300EX Sportrax models. This 74.45 mm, +0.50 mm oversize kit features an 11:1 compression ratio and includes the essential components needed to refresh the top end of the engine. The kit includes a piston, piston rings, wrist pin, wrist pin clips, top end bearing, and gasket kit for a complete installation solution.
The piston uses Namura’s MOS2, or Teflon/Molybdenum, coated skirts. This rolled-on coating process creates a bond claimed to be 10 times stronger than spray-on alternatives, helping improve 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 consistent engine performance.
Anodized dome technology improves heat resistance and durability, while the hypereutectic casting process provides increased silicon content for reduced expansion and added wear resistance. The piston is also engineered to withstand elevated cylinder temperatures. These features make the Namura NA-10005-2K a practical replacement for riders rebuilding or servicing the top end of compatible Honda Sportrax engines.
Fitment: Fits 1993–2002 Honda TRX300EX Sportrax models. Verify the existing cylinder bore, required oversize, compression ratio, and service specifications before installation. The manufacturer is Namura, and the vendor part number is NA-10005-2K.
Features:
- Complete top end kit includes piston, rings, wrist pin, clips, top end bearing, and gasket kit
- 74.45 mm piston size with +0.50 mm oversize and 11:1 compression ratio
- MOS2 Teflon/Molybdenum-coated piston skirts help reduce friction, improve heat transfer, and minimize cold seizure risk
- Machined smooth piston head reflects combustion heat and helps reduce carbon buildup
- Anodized piston dome improves heat resistance and durability
- Hypereutectic casting process provides reduced expansion and increased wear resistance
- Fits 1993–2002 Honda TRX300EX Sportrax models
Fitment:
1993 Honda TRX300EX Sportrax
1994 Honda TRX300EX Sportrax
1995 Honda TRX300EX Sportrax
1996 Honda TRX300EX Sportrax
1997 Honda TRX300EX Sportrax
1998 Honda TRX300EX Sportrax
1999 Honda TRX300EX Sportrax
2000 Honda TRX300EX Sportrax
2001 Honda TRX300EX Sportrax
2002 Honda TRX300EX Sportrax
2003 Honda TRX300EX Sportrax
2004 Honda TRX300EX Sportrax
2005 Honda TRX300EX Sportrax
2006 Honda TRX300EX Sportrax
2007 Honda TRX300EX Sportrax
2008 Honda TRX300EX Sportrax
2009 Honda TRX300EX Sportrax
2009 Honda TRX300X