Restore top-end performance with the NAMURA NX-10051K Top End Kit, designed for 2004–2009 and 2011–2014 Honda CRF50F models. This standard-bore, flat-top piston kit is engineered for reliable fitment and includes the essential components needed for a complete top-end rebuild, including the piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit. The kit is suited for Honda CRF50F applications using the 39 mm standard-bore configuration and an 11:1 compression ratio.
The NAMURA 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 are applied using a rolled-on process designed to create a durable bond while reducing friction, improving heat transfer, and helping minimize the risk of cold seizures. These features support dependable operation in recreational riding, maintenance, and engine restoration applications.
The piston also features a machined-smooth head to reflect combustion heat and help reduce carbon buildup, protecting the piston crown during operation. An anodized dome adds heat resistance and durability for extended service life. Manufactured by NAMURA and identified by manufacturer part number NX-10051K, this top-end kit is a practical replacement solution for rebuilding compatible Honda CRF50F engines. Vendor part number 185-1051 is included for product reference and ordering.
Features:
- Complete Top End Kit: Includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit
- Fitment: Designed for 2004–2009 and 2011–2014 Honda CRF50F models
- Standard-Bore Configuration: 39 mm standard-bore piston with an 11:1 compression ratio
- MOS2-Coated Skirts: Rolled-on Teflon/molybdenum coating helps reduce friction, improve heat transfer, and minimize cold-seizure risk
- Machined-Smooth Head: Helps reflect combustion heat and reduce carbon buildup on the piston
- Anodized Dome: Provides increased heat resistance and durability
- Hypereutectic Casting: Higher silicon content helps control expansion and improve wear resistance
- Manufacturer Part Number: NAMURA NX-10051K
- Vendor Part Number: 185-1051
Fitment:
2000 Honda XR50R
2001 Honda XR50R
2002 Honda XR50R
2003 Honda XR50R
2004 Honda CRF50F
2005 Honda CRF50F
2006 Honda CRF50F
2007 Honda CRF50F
2008 Honda CRF50F
2009 Honda CRF50F
2011 Honda CRF50F
2012 Honda CRF50F
2013 Honda CRF50F
2014 Honda CRF50F
2015 Honda CRF50F
2016 Honda CRF50F