The Namura NX-40080-2B piston kit is designed for reliable replacement performance in compatible Yamaha two-stroke motocross motorcycles. This ceramic-composite piston kit features a 47.45 mm bore size, +0.51 mm oversize specification, and an 8.2:1 compression ratio. It is engineered for fitment with select Yamaha YZ80 and YZ85 applications and provides the essential components needed for a piston service.
Each Namura piston kit includes an individually wrapped piston, a set of OEM-quality piston rings packaged separately, an OEM-quality wrist pin, and cir-clips. The included components support an efficient installation while helping restore proper engine operation and compression. Verify cylinder condition, bore size, and clearance requirements before installation to ensure correct fitment and performance.
Fitment includes 1993–2001 Yamaha YZ80 models and the 2002 Yamaha YZ85. The manufacturer part number is NX-40080-2B, and the vendor part number is 184-400802B. This kit is intended for use with the specified Yamaha applications and should be installed according to the motorcycle manufacturer's service procedures.
Features:
- Size: 47.45 mm piston bore size with +0.51 mm oversize specification
- Model: Ceramic-composite piston kit with an 8.2:1 compression ratio
- Brand: Namura
- Manufacturer Part Number: NX-40080-2B
- Vendor Part Number: 184-400802B
- Included Components: Individually wrapped piston, OEM-quality rings, wrist pin, and cir-clips
- 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