The RFX Air Filter, manufactured by Multi Air, is a replacement foam air filter designed for select KTM off-road and motocross motorcycles. Part number FXAF 50005 55NO provides a precise fit for compatible airbox applications, helping maintain dependable airflow and filtration during riding, racing, and routine maintenance.
Built with breathable twin-layered foam, this filter helps capture dirt and debris while supporting consistent engine air supply. The nonflammable foam construction is used on the applicable four-stroke models for added suitability in demanding riding environments. Multi Air brings more than 30 years of air-filter experience to the RFX range, making this filter a practical replacement for riders seeking reliable fitment and service performance.
This RFX air filter fits 2007–2010 KTM 250 SX models, 2007–2010 KTM 250 SX-F models, and 2008–2009 KTM 450 EXC-R four-stroke models. Verify the motorcycle model year and airbox application before installation. The filter is supplied as a vehicle-specific replacement component and should be serviced according to the motorcycle manufacturer’s maintenance recommendations.
Features:
- Size: Vehicle-specific replacement air filter for compatible KTM applications
- Model: RFX Air Filter
- Brand: RFX
- Manufacturer: Multi Air
- Manufacturer Part Number: FXAF 50005 55NO
- Vendor Part Number: FXAF 50005 55NO
- Construction: Breathable twin-layered foam
- Material: Nonflammable foam for applicable four-stroke models
- Fitment: 2007–2010 KTM 250 SX
- Fitment: 2007–2010 KTM 250 SX-F
- Fitment: 2008–2009 KTM 450 EXC-R four-stroke
Fitment:
2007 KTM 125 SX
2007 KTM 250 SX
2007 KTM 250 SX-F
2007 KTM 450 SX-F
2008 KTM 125 Exc
2008 KTM 125 SX
2008 KTM 200 Exc
2008 KTM 250 EXC
2008 KTM 250 SX
2008 KTM 250 SX-F
2008 KTM 300 EXC
2008 KTM 450 EXC-R 4-Stroke
2008 KTM 450 SX-F
2008 KTM 505 Sx-F
2009 KTM 125 Exc
2009 KTM 125 SX
2009 KTM 150 SX
2009 KTM 200 Exc
2009 KTM 250 SX
2009 KTM 250 SX-F
2009 KTM 450 EXC-R 4-Stroke
2009 KTM 450 SX-F
2009 KTM 530 EXC-R 4-Stroke
2010 KTM 125 SX
2010 KTM 150 SX
2010 KTM 200 Exc
2010 KTM 250 SX
2010 KTM 250 SX-F
2010 KTM 450 EXC-R 4-Stroke
2010 KTM 450 SX-F
2010 KTM 530 EXC-R 4-Stroke
2011 KTM 200 Exc
2011 KTM 450 EXC-R 4-Stroke
2011 KTM 530 EXC-R 4-Stroke