The Namura NX-10081-BK Top End Kit is designed for select Honda CR80R and CR85R two-stroke motorcycles. This complete top-end solution includes a piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit for a convenient rebuild. The kit is intended for Nikasil-plated cylinders and features a 47.45 mm piston size with an 8.4:1 compression ratio.
Built using Namura's hypereutectic casting process, the piston provides increased silicon content for controlled expansion, improved wear resistance, and dependable performance at elevated cylinder temperatures. The piston skirts feature a rolled-on MOS2 coating made from Teflon and molybdenum. This application method creates a strong bond while helping reduce friction, improve heat transfer, and minimize the risk of cold seizures.
The piston also includes a machined smooth head to reflect combustion heat and help reduce carbon buildup. An anodized dome improves heat resistance and durability, providing additional protection during demanding riding conditions. This Namura top-end kit is a practical replacement for restoring compression and supporting reliable engine operation. It fits 1996-2000 Honda CR80R models and 2003-2007 Honda CR85R models. Verify the motorcycle year, model, cylinder condition, and required piston size before installation.
Features:
- Complete top-end kit includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit
- 47.45 mm piston size for Nikasil-plated cylinders
- 8.4:1 compression ratio supports dependable two-stroke engine performance
- MOS2 Teflon and molybdenum-coated piston skirts help 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 increases heat resistance and durability
- Hypereutectic casting process provides controlled expansion and improved wear resistance
- Brand: Namura
- Manufacturer part number: NX-10081-BK
- Vendor part number: 185-1081B
- Fitment: 1996-2000 Honda CR80R and 2003-2007 Honda CR85R
Fitment:
1992 Honda CR80R
1993 Honda CR80R
1994 Honda CR80R
1995 Honda CR80R
1996 Honda CR80R
1997 Honda CR80R
1998 Honda CR80R
1999 Honda CR80R
2000 Honda CR80R
2001 Honda CR80R
2002 Honda CR80R
2003 Honda CR85R
2004 Honda CR85R
2005 Honda CR85R
2006 Honda CR85R
2007 Honda CR85R