The RFX Multi Air Foam Air Filter, manufacturer part number FXAF 40004 55NO, is designed to provide dependable filtration and airflow for select Yamaha off-road motorcycles. Produced by Multi Air for RFX, this replacement filter is a practical choice for riders seeking reliable engine protection and consistent performance in motocross and trail applications.
Featuring breathable, twin-layered foam, the filter helps capture dirt and debris while supporting adequate airflow to the engine. Its precise fitment makes installation straightforward and helps maintain a secure seal within the airbox. The nonflammable foam construction is suitable for the listed four-stroke Yamaha models, providing durable service during demanding riding conditions.
Fitment includes the 2014–2017 Yamaha YZ250F, 2014–2017 Yamaha YZ450F, and 2011–2012 Yamaha WR250F. Verify the model year and motorcycle application before installation. With more than 30 years of experience, Multi Air manufactures filtration products trusted for dependable fit and function, while the RFX brand delivers this industry-leading replacement air filter for routine maintenance or replacement of a worn filter.
Features:
- Brand: RFX
- Manufacturer: Multi Air
- Manufacturer part number: FXAF 40004 55NO
- Vendor part number: 739-0068
- Filter type: Twin-layer foam air filter
- Construction: Breathable foam designed for reliable dirt and debris filtration
- Material: Nonflammable foam for listed four-stroke applications
- Fitment: 2014–2017 Yamaha YZ250F
- Fitment: 2014–2017 Yamaha YZ450F
- Fitment: 2011–2012 Yamaha WR250F
Fitment:
2010 Yamaha WR250F
2011 Yamaha WR250F
2012 Yamaha WR250F
2013 Yamaha WR250F
2014 Yamaha WR250F
2014 Yamaha YZ250F
2014 Yamaha YZ450F
2015 Yamaha WR250F
2015 Yamaha YZ250F
2015 Yamaha YZ450F
2016 Yamaha WR250F
2016 Yamaha YZ250F
2016 Yamaha YZ450F
2017 Yamaha WR250F
2017 Yamaha YZ250F
2017 Yamaha YZ450F
2018 Yamaha WR250F
2018 Yamaha YZ250F
2019 Yamaha WR250F