Restore dependable top-end performance with the NAMURA NX-10081K Top End Kit, designed for select Honda CR80R and CR85R two-stroke motorcycles. This complete kit includes a piston, piston rings, wrist pin, wrist-pin clips, top-end bearing, and gasket kit, providing the essential components needed for a thorough top-end rebuild. The kit is intended for Nikasil-plated cylinders and uses a 47.44 mm standard-bore piston with an 8.4:1 compression ratio.
The NAMURA piston is manufactured using a hypereutectic casting process that increases silicon content for controlled expansion, added wear resistance, and improved durability at elevated cylinder temperatures. Its MOS2, or Teflon and molybdenum, coated skirts use a rolled-on application process for a strong, durable bond. This coating helps reduce friction, improve heat transfer, and minimize the risk of cold seizures during operation.
Additional piston features include a machined-smooth head that helps reflect combustion heat and reduce carbon buildup, along with an anodized dome that improves heat resistance and durability. These design features support reliable operation and consistent performance when rebuilding the top end of a compatible Honda two-stroke engine. The NAMURA manufacturer part number and vendor part number are both NX-10081K.
Fitment includes 1996–2000 Honda CR80R models and 2003–2007 Honda CR85R models. Verify the motorcycle year, cylinder condition, bore specification, and Nikasil cylinder compatibility before installation. Professional installation and proper engine break-in procedures are recommended.
Features:
- Complete top-end kit includes piston, rings, wrist pin, wrist-pin clips, top-end bearing, and gasket kit
- 47.44 mm standard-bore piston for compatible Nikasil-plated cylinders
- 8.4:1 compression ratio supports the specified Honda CR80R and CR85R applications
- MOS2 Teflon and molybdenum coated 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 improves heat resistance and durability
- Hypereutectic casting process provides controlled expansion and increased wear resistance
- Fits 1996–2000 Honda CR80R and 2003–2007 Honda CR85R models
- Brand: NAMURA
- Manufacturer part number: NX-10081K
- Vendor part number: NX-10081K
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