The facts.
DescriptionThe whole story▼
A part number in a catalogue is not a recommendation. Sprint Filter builds each of its media for essentially every airbox it has tooled, which is why a racing element exists for the GB350 and GB350S as readily as for a superbike. The listing describes the range, not the motorcycle. Read that way, the SM289S F1-85 is an option to be judged on its own terms: 15,000 l/m²/sec of air flow against the standard P08's 5,050, achieved with a patented weave of 22-micron threads — the 85 is a name, not a pore size. Nobody should buy it because it appeared in a search for their bike. It is worth buying only if the engine can use that flow.
Key Features
- Dry polyester that never meets oil, so nothing can migrate onto the sensors downstream
- Air flow of 15,000 l/m²/sec, about three times what the standard P08 manages
- Not bought with a coarser aperture: 95.22 % of 100-micron particles retained in the maker's test, road medium 93.13 %
- Around twice the filtering surface of other performance elements
- Standard airbox, direct replacement: nothing modified, nothing remapped
- Blown through and refitted; the element is built to last the motorcycle’s life
How this catalogue is organised
Sprint Filter catalogues parts by airbox rather than by intention. One element covers five machines here, and each medium is offered across that whole group regardless of whether any of them ever turns a lap in anger. So the racing option appears under a mild-mannered 350 single for the same reason a road medium appears under a race bike: the shape of the housing decided it. Knowing that changes how the page should be read. The question is not whether Sprint Filter offers an F1-85 for the GB350, but which of its media suits the way this particular GB350 is used.
The media are a line, not a ladder
Among the finer media, every step towards finer filtration is a step away from flow, and the figures make that plain: 80 microns at 5,050 l/m²/sec for the P08, 37 microns at 4,500 for the water-repellent P037, 14 microns at 1,800 for the P14 and 7 microns at 560 for the T12. The F1-85 stands apart at 15,000, a racing weave rather than a coarser one. None of them is the best one; each has its place. An unfaired 350 single used on the road across all weathers belongs near the middle — the P08 for general use, the P14 where the roads are dusty, the P037 where they are wet. The high-flow end, where the SM289S F1-85 sits, belongs to engines built to use the air and serviced on a racing schedule.
Care and cleaning
Blow it out from the clean side with compressed air, working outwards, and refit it dry. That covers most of what the element ever needs. The occasional deeper clean is lukewarm water and a mild detergent, rinsed until the water runs clear, followed by open-air drying alone — no heat source, no flame. The medium is dry by design and takes no oil at any point in its life. Sprint Filter’s maintenance sheet is in the Downloads tab.
Fitment & Compatibility
Made for the Honda GB350 and GB350S from 2021 to 2026. The same SM289S F1-85 element covers five machines sharing 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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