The facts.
DescriptionThe whole story▼
Dust is a whole-motorcycle problem. It grinds away at a chain, embeds itself in brake pads, works past fork seals and shortens the life of any bearing left unsealed. Nearly all of that damage announces itself — it can be seen, heard or felt, and it is repaired with parts sold over a counter for the price of an afternoon. The intake is the exception. It is the one route by which airborne grit gets inside the engine, where nothing can be inspected, nothing complains on a particular day and the eventual repair is the engine itself. That asymmetry is the whole argument for a finer element, and it is what the Sprint Filter P14 SM289P14 offers on the H’ness: 14 micron filtration where the standard P08 weave works at 80.
Key Features
- Nothing is oiled onto this dry special non-woven, which filters down to 14 microns
- The air conceded — 1,800 l/m²/sec against the P08’s 5,050 — is what buys the extra retention
- Filtering area is about twice that of other performance elements
- A direct swap in the standard airbox: no modification, no remap, no change to homologation
- Serviced with compressed air on the clean side, then washed and reused rather than replaced
- Designed for the motorcycle’s whole life; two years of warranty from purchase
The one path with no way back
Everything downstream of the filter is a running surface or a sensor. Whatever the element misses crosses the throttle body, meets the port and then the cylinder wall, and a share of it is wiped down past the rings into the sump, where the oil keeps it in circulation until the next drain. None of that produces a noise, a warning light or a mark on an inspection sheet; it shows up years later as an engine that uses more oil than its neighbours. Filtration is insurance against a bill that is never itemised, which is exactly why it tends to be the last thing anyone spends money on.
The price of the finer medium
It is worth being clear that this is a trade rather than an upgrade. A tighter path holds back more and passes less: 1,800 l/m²/sec against the P08's 5,050. The reason it works on the H’ness CB350 is arithmetic rather than enthusiasm — a low-revving 350 cc single ridden at part throttle never draws on the reserve the standard weave keeps in hand, so conceding some of it changes nothing the rider was using. What does change is how soon the element wants attention, since a finer medium collects more of what passes through it.
Care and cleaning
Two levels of service, and both end the same way. The usual one is compressed air on the clean side, blown outwards. The heavier one is lukewarm water with a mild detergent, rinsed until the water runs clear. Either way it then dries in open air — never with heat, never near a flame — and goes back into the airbox dry, with no oiling stage anywhere. The maintenance sheet for the SM289P14 is in the Downloads tab.
Fitment & Compatibility
Made for the Honda H’ness CB350 from 2020 to 2026. The same SM289P14 element covers five machines built around this 350 cc single; the complete list is in the Fitment tab.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- Honda CB350 (2021–2026)
- Honda CB350RS (2020–2026)
- Honda GB350C (2024–2026)
- Honda GB350 / GB350S (2021–2026)
- Honda H’ness CB350 (2020–2026)
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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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Take out the washable lining and hand-wash it in lukewarm water. Clean the shell and visor with a soft cloth and water only — never solvents.
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