Restore top-end performance with the NAMURA NX-40080K Top End Kit, designed for 1993–2001 Yamaha YZ80 motorcycles. This standard-bore kit includes a piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit for a convenient cylinder-top overhaul. The 46.95 mm piston is engineered for a 11:1 compression ratio and is intended to provide dependable fitment for the listed Yamaha YZ80 applications.
The piston features NAMURA's MOS2, or Teflon and molybdenum, coated skirts. The rolled-on coating process creates a strong bonded surface that helps reduce friction, improve heat transfer, and minimize the risk of cold seizures. Machined smooth piston heads help reflect combustion heat and reduce carbon buildup, supporting piston protection and consistent engine operation. Anodized domes provide increased heat resistance and durability compared with non-anodized designs.
NAMURA uses a hypereutectic casting process to increase silicon content, helping reduce expansion and improve wear resistance under elevated cylinder temperatures. The included gasket kit and top-end components make the NX-40080K a practical replacement solution for maintenance or engine refurbishment. Verify cylinder condition, bore specifications, and model-year compatibility before installation.
Fitment includes 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, and 2001 Yamaha YZ80 models. Manufacturer part number: NX-40080K. Vendor part number: 185-4080.
Features:
- Complete top-end kit includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit
- 46.95 mm standard-bore piston designed for an 11:1 compression ratio
- MOS2 Teflon and molybdenum coated skirts help reduce friction, improve heat transfer, and minimize cold-seizure risk
- Machined smooth head helps reflect combustion heat and reduce carbon buildup
- Anodized dome improves heat resistance and piston durability
- Hypereutectic casting process increases silicon content for reduced expansion and improved wear resistance
- Fits 1993–2001 Yamaha YZ80 models
- Brand: NAMURA
- Manufacturer part number: NX-40080K
- Vendor part number: 185-4080
Fitment:
1993 Yamaha YZ80
1994 Yamaha YZ80
1995 Yamaha YZ80
1996 Yamaha YZ80
1997 Yamaha YZ80
1998 Yamaha YZ80
1999 Yamaha YZ80
2000 Yamaha YZ80
2001 Yamaha YZ80