Namura Technologies forged piston kit FX-40037-C is a complete forged piston assembly for 250cc Yamaha off-road 250F engines, intended for top-end servicing in standard 77mm class applications across YZ/WR/FX 250F models, supplied with matched rings and installation hardware.

Features

• Forged piston kit for off-road engine rebuilds


• Supplied with piston


• Supplied with a set of OEM-quality piston rings


• Supplied with wrist pin


• Supplied with circlips

Specifications

• Size: 77mm


• Piston diameter: 77.00mm


• Bore size: 76.97mm


• Oversize: +0.02mm (Size C)


• Compression ratio: 13.5:1 (high compression)

Cross-Reference OEM Part Numbers

• FX-40037-C


• NX-20030R


• 56-W4961.C.NT


• 0758891090371


• 1SM-11631-01-00

Vehicle Fitments

• Yamaha YZ250F 2014–2018


• Yamaha YZ250FX 2015–2016


• Yamaha WR250F 2015–2017


• Yamaha YZ250FX 2015–2019


• Yamaha WR250F 2015–2019