BMC FM478/04 replacement air filter for Honda CBR 600 RR 2007 to 2025
02 · Data & docs

The facts.

Technical data
BrandBMC
Part numberFM478/04
Filter mediaFour-layer oiled cotton gauze
Frame materialMoulded rubber
Mesh surroundAluminium (anti-oxidation, petrol vapour resistant)
Fitment typeDirect OEM replacement
Compatible modelHonda CBR 600 RR, 2007–2025
MaintenanceWashable and reusable
DescriptionThe whole story

Developed from BMC's racing programme and engineered for the Honda CBR 600 RR across the 2007 to 2025 model range, the FM478/04 replacement air filter delivers the kind of unrestricted airflow that separates a quick road bike from a genuinely fast one. Whether you are chasing lap times or simply want every horsepower the inline-four has to offer, this is the filter that unlocks it.

Key Features

  • Four-layer oiled cotton gauze construction maximises airflow while maintaining filtration efficiency far above standard paper elements
  • Low-tack oil treatment strikes the optimum balance between particle absorption and air permeability, reducing pressure drop to an absolute minimum
  • Surrounding aluminium mesh shields the media from petrol vapours and oxidation, preserving filter performance over thousands of kilometres
  • Rubber frame eliminates the cracking and seal failures that plague lesser aftermarket filters under sustained high-rpm use
  • Washable and reusable — a single purchase replaces the recurring cost of disposable OEM paper filters
  • Validated against international test standards for filtration efficiency and flow, ensuring real-world performance matches the engineering claims

Racing DNA, Road-Going Durability

BMC built its reputation on the pit lanes of MotoGP and World Superbike before bringing that technology to production-based machines. The FM478/04 is a direct result: a filter that flows more air than the factory Honda paper element without sacrificing the filtration that keeps your engine clean. On track, the gain in mid-to-top-range response is immediately noticeable; on the road, the reusable construction means the filter earns back its purchase price many times over across a season of riding.

Construction Detail

The four-layer cotton gauze is precision-woven to create a consistent, tortuous path for incoming air — trapping fine particles whilst allowing a far greater volume of air to reach the throttle bodies than a paper filter permits. The aluminium mesh surround is not merely structural; it forms a chemical barrier against the petrol vapour that degrades unprotected filter media, keeping the cotton layers supple and effective. The moulded rubber frame seats perfectly in the CBR 600 RR's airbox without modification, maintaining an airtight seal at all engine speeds.

Fitment & Compatibility

The BMC FM478/04 is a direct OEM replacement fitment for the following:

  • Honda CBR 600 RR — all variants, model years 2007 to 2025

No airbox modification is required. The filter drops straight into the standard housing and seals identically to the original element.

Specifications

Attribute Detail
Brand BMC
Part number FM478/04
Filter media Four-layer oiled cotton gauze
Frame material Moulded rubber
Mesh surround Aluminium (anti-oxidation, petrol vapour resistant)
Fitment type Direct OEM replacement (no modification required)
Compatible model Honda CBR 600 RR, 2007–2025
Maintenance Washable and reusable
FitmentWhich bikes this fits
  • Honda CBR 600 RR (2007–2025)
07 · Support

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08 · Paddock

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