The facts.
DescriptionThe whole story▼
The word Racing in a part name is a description of intent, not a certificate. Nothing about the P08 F1-85 is homologated, approved or type-tested for road use, and nothing about it needs to be: it is a filter element that sits inside the standard airbox of a Honda CB400X and changes nothing a technical inspection looks at. No bodywork moves, no exhaust changes, no mapping is touched, and the airbox keeps its original lid, inlet and volume. What changes is the fabric inside it — a dry polyester racing medium flowing 15,000 l/m²/sec and, in Sprint Filter's test, retaining 95.22 % of 100-micron particles, where the road-going P08 flows 5,050 and retains 93.13 %.
Key Features
- The racing medium: threads from 22 µm, air flow of 15,000 l/m²/sec
- Dry polyester with no oil in it, so no film can reach a hot-film sensor or the throttle bodies
- The medium presents about twice the filtering area of a normal performance element
- Sits inside the standard CB400X airbox — nothing modified, nothing remapped, nothing to declare
- Cleaned from the clean side with compressed air, washed when needed, used again
- Two years of warranty on an element designed to last the life of the motorcycle
An internal change, and therefore a reversible one
Because the element is entirely inside the airbox, the CM220S F1-85 leaves no trace on the outside of the motorcycle and no entry in any document. It can be taken out and the original element put back in an afternoon, which is worth knowing for a bike that might be sold, inspected periodically or ridden in more than one country. That is a practical point rather than a legal opinion — rules on modification differ by market, and the responsibility for what is fitted stays with the owner. It is simply true that this particular change is internal, reversible and invisible.
Whether it belongs on a CB400X at all
Being honest about it: the X is the touring-shaped member of this family, and the racing medium is not the obvious choice for it. A bike used for distance on public roads meets more dust than a circuit does, and the F1-85 is tuned for flow, not for fine dust. The standard P08 covers road and track sensibly, and the P14 at 14 microns is the one for dusty routes. The F1-85 earns its place on a CB400X in one situation: when the bike has become a track machine, is serviced on a race schedule, and its engine is already breathing through more than the standard intake.
Care and cleaning
No oiling stage exists for this medium, out of the box or after a wash. Compressed air from the clean side, directed outwards, is the standard service. When a hard weekend has earned it, lukewarm water with a mild detergent, rinsed until the water runs clear, then dried right through in moving air; never with heat, never with a flame. It goes back in dry. The Sprint Filter maintenance sheet is in the Downloads tab.
Fitment & Compatibility
Made for the Honda CB400X from 2019 to 2026. The CM220S F1-85 covers six machines across Honda's 400 and 500 twin range from one shared airbox design; the complete list is in the Fitment tab.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- Honda CB400F (2019–2026)
- Honda CB400X (2019–2026)
- Honda CBR400R (2019–2026)
- Honda CB500F (2019–2026)
- Honda CB500X (2019–2026)
- Honda CBR500R (2019–2026)
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Measure your head circumference about one centimetre above your eyebrows and compare it with the size chart on this page. Between sizes? Choose the smaller one — the padding beds in with use.
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