The RFX Pre-Oiled Twin-Layer Air Filter, manufacturer part number FXAF 50003 55PO, is produced by Multi Air for dependable air filtration and precise fitment on select KTM and Husqvarna mini motocross motorcycles. Designed as a direct-fit replacement, this pre-oiled filter helps protect the engine from dirt and debris while supporting consistent airflow during riding and competition.
Built with breathable, twin-layer foam, the RFX air filter offers effective filtration without restricting engine performance. Nonflammable foam is used for all four-stroke models, providing a durable construction suited to demanding off-road conditions. With more than 30 years of filter manufacturing experience, Multi Air delivers a trusted replacement option for riders who require reliable fitment and serviceability.
This RFX filter fits the 2018–2021 KTM 85 SX in the 17/14 configuration and select 2018–2020 Husqvarna TC 85 models in the 17/14 and 19/16 configurations. Confirm the motorcycle year, model, and wheel configuration before ordering. The RFX brand and FXAF 50003 55PO manufacturer and vendor part number are provided for accurate product identification.
Features:
- Size: Pre-oiled replacement air filter for select KTM and Husqvarna 85cc motocross models
- Model: Twin-layer foam air filter
- Brand: RFX
- Manufacturer: Multi Air
- Manufacturer part number: FXAF 50003 55PO
- Vendor part number: FXAF 50003 55PO
- Fitment: 2018–2021 KTM 85 SX with 17/14 wheels
- Fitment: 2018–2020 Husqvarna TC 85 with 17/14 or 19/16 wheels
- Material: Breathable twin-layer foam
- Construction: Nonflammable foam for four-stroke applications
- Application: Direct-fit replacement air filter for off-road motorcycles
Fitment:
2018 Husqvarna TC 85 (17/14)
2018 KTM 85 SX (17/14)
2019 Husqvarna TC 85 (17/14)
2019 Husqvarna TC 85 (19/16)
2019 KTM 85 SX (17/14)
2020 Husqvarna TC 85 (17/14)
2020 Husqvarna TC 85 (19/16)
2020 KTM 85 SX (17/14)
2021 Husqvarna TC 85 (17/14)
2021 Husqvarna TC 85 (19/16)
2021 KTM 85 SX (17/14)
2022 Husqvarna TC 85 (17/14)
2022 Husqvarna TC 85 (19/16)
2022 KTM 85 SX (17/14)
2023 Gas-Gas MC 85 17/14
2023 Husqvarna TC 85 (17/14)
2023 Husqvarna TC 85 (19/16)
2023 KTM 85 SX (17/14)
2024 Gas-Gas MC 85 17/14
2024 Husqvarna TC 85 (17/14)
2024 Husqvarna TC 85 (19/16)
2024 KTM 85 SX (17/14)
2025 Gas-Gas MC 85 17/14
2025 Husqvarna TC 85 (17/14)
2025 Husqvarna TC 85 (19/16)
2025 KTM 85 SX (17/14)
2026 Gas-Gas MC 85 17/14
2026 Husqvarna TC 85 (17/14)
2026 Husqvarna TC 85 (19/16)
2026 KTM 85 SX (17/14)