The Namura NX-40026-B piston kit is designed for select Yamaha 250cc two-stroke applications and features a ceramic-composite piston construction with a 10.6:1 compression ratio. This replacement kit is manufactured to support dependable engine performance, consistent compression, and reliable service in compatible Yamaha WR250 and YZ250 models.
Each kit includes an individually wrapped Namura piston, a set of OEM-quality piston rings packed in a separate box, an OEM-quality wrist pin, and circlips. The components are supplied together to simplify piston replacement and help ensure the essential hardware is available during engine service. The piston is identified as a 67.95 mm replacement size with a +0.01 specification.
Fitment includes 1992–1997 Yamaha WR250 models and 1992–1995 Yamaha YZ250 models. Verify the existing cylinder condition, piston clearance, and application specifications before installation. This Namura kit is intended for compatible Yamaha engines requiring the NX-40026-B piston configuration.
Brand: Namura. Manufacturer Part Number: NX-40026-B. Vendor Part Number: 184-40026B.
Features:
- Ceramic-composite piston designed for compatible Yamaha 250cc two-stroke engines
- 67.95 mm replacement piston size with a +0.01 specification
- 10.6:1 compression ratio
- Includes one individually wrapped Namura piston
- Includes OEM-quality piston rings in a separate box
- Includes an OEM-quality wrist pin and circlips
- Fits 1992–1997 Yamaha WR250 models
- Fits 1992–1995 Yamaha YZ250 models
- Manufacturer Part Number: NX-40026-B
- Vendor Part Number: 184-40026B
Fitment:
1992 Yamaha WR250
1992 Yamaha YZ250
1993 Yamaha WR250
1993 Yamaha YZ250
1994 Yamaha WR250
1994 Yamaha YZ250
1995 Yamaha WR250
1995 Yamaha YZ250
1996 Yamaha WR250
1996 Yamaha YZ250
1997 Yamaha WR250
1997 Yamaha YZ250
1998 Yamaha WR250
1998 Yamaha YZ250