The Namura NX-40080-2 piston kit is designed for select Yamaha two-stroke motocross motorcycles requiring a 47.44 mm piston with a +0.50 mm oversize specification. This ceramic-designed piston kit supports reliable engine rebuilding and is engineered for applications with an 8.2:1 compression ratio. It is a direct-fit replacement solution for compatible Yamaha YZ80 and YZ85 models when cylinder machining and clearance specifications are verified before installation.
Each Namura piston kit includes an individually wrapped piston, a set of OEM-quality piston rings packed separately, an OEM-quality wrist pin, and circlips. The included components help provide a practical, matched package for top-end service while supporting proper piston movement, ring sealing, and wrist-pin retention. Always inspect the cylinder, confirm the required oversize, and follow the motorcycle manufacturer’s service procedures for installation.
Fitment includes 1993 through 2001 Yamaha YZ80 models and the 2002 Yamaha YZ85. Confirm model year, cylinder condition, bore requirements, and piston-to-cylinder clearance before ordering. Manufactured by Namura and identified by manufacturer and vendor part number NX-40080-2, this piston kit is intended for riders, technicians, and repair professionals performing a compatible Yamaha engine rebuild.
Features:
- Size: 47.44 mm piston diameter with a +0.50 mm oversize specification
- Model: Ceramic-designed compression piston kit with an 8.2:1 compression ratio
- Brand: Namura
- Manufacturer Part Number: NX-40080-2
- Included Components: Individually wrapped piston, OEM-quality piston rings, wrist pin, and circlips
- Fitment: 1993–2001 Yamaha YZ80 and 2002 Yamaha YZ85
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
2002 Yamaha YZ85
2003 Yamaha YZ85
2004 Yamaha YZ85
2005 Yamaha YZ85
2006 Yamaha YZ85
2007 Yamaha YZ85
2008 Yamaha YZ85
2009 Yamaha YZ85
2010 Yamaha YZ85
2011 Yamaha YZ85
2012 Yamaha YZ85
2013 Yamaha YZ85
2014 Yamaha YZ85
2015 Yamaha YZ85
2016 Yamaha YZ85
2017 Yamaha YZ85
2018 Yamaha YZ85
2019 Yamaha YZ85
2020 Yamaha YZ85
2021 Yamaha YZ85