The Namura NX-40025 piston kit is designed for reliable engine rebuilding and replacement applications on select Yamaha two-stroke motorcycles. This ceramic-coated piston kit features a 66.35 mm standard-bore piston with a 10.9:1 compression ratio, providing a dependable replacement solution for compatible original-equipment cylinder assemblies.
Each Namura piston kit includes an individually wrapped piston, a set of OEM-quality piston rings packaged separately, an OEM-quality wrist pin, and circlips. The included components are selected to support a complete piston replacement while helping simplify installation and maintenance. Verify cylinder condition, piston clearance, and service specifications before installation.
Fitment includes the 2016 and 2017 Yamaha YZ250X, as well as Yamaha YZ250 models from 1999 through 2006. This product is manufactured by Namura and is identified by manufacturer part number NX-40025 and vendor part number NX-40025. Confirm the motorcycle model year and engine specifications before ordering to ensure proper compatibility.
Features:
- Size: 66.35 mm standard-bore piston
- Compression Ratio: 10.9:1
- Coating: Ceramic-coated piston design
- Included Components: Individually wrapped piston, OEM-quality rings, wrist pin, and circlips
- Fitment: 2016–2017 Yamaha YZ250X and 1999–2006 Yamaha YZ250
- Brand: Namura
- Manufacturer Part Number: NX-40025
- Vendor Part Number: NX-40025
Fitment:
1999 Yamaha YZ250
2000 Yamaha YZ250
2001 Yamaha YZ250
2002 Yamaha YZ250
2003 Yamaha YZ250
2004 Yamaha YZ250
2005 Yamaha YZ250
2006 Yamaha YZ250
2007 Yamaha YZ250
2008 Yamaha YZ250
2009 Yamaha YZ250
2010 Yamaha YZ250
2011 Yamaha YZ250
2012 Yamaha YZ250
2013 Yamaha YZ250
2014 Yamaha YZ250
2015 Yamaha YZ250
2016 Yamaha YZ250
2016 Yamaha YZ250X
2017 Yamaha YZ250
2017 Yamaha YZ250X
2018 Yamaha YZ250
2018 Yamaha YZ250X
2019 Yamaha YZ250
2019 Yamaha YZ250X
2020 Yamaha YZ250
2020 Yamaha YZ250X
2021 Yamaha YZ250
2021 Yamaha YZ250X
2022 Yamaha YZ250
2022 Yamaha YZ250X