The facts.
DescriptionThe whole story▼
Three Sprint Filter media are catalogued for this airbox. Two of them, the standard P08 and the finer P14, cover all three machines that share it: the KTM 790 Duke and the two Husqvarna 801 models. The third, PM283S F1-85, is listed against one machine only, the 790 Duke. Not because the Husqvarnas have a different housing — they do not. It is a listing decision, and a fitment list says what a manufacturer chose to catalogue, not which motorcycle deserves which cloth.
Key Features
- Racing-specification dry polyester weave, used without oil
- Threads from 22 microns in diameter; 15,000 litres per square metre per second of flow
- 95.22 per cent retention of 100-micron particles, measured by Sprint Filter
- Threads from ø 22 microns — the thread, not the gap between threads
- Fits the production airbox, no modification and no remapping
- Two years of warranty from the date of purchase
A racing weave that holds back more than the standard one
The F1-85 is the freest-flowing weave in the range and, in Sprint Filter's own comparison, the highest-retaining: 95.22 per cent of 100-micron particles against 93.13 per cent for the standard P08, with four-layer oiled cotton at 76.42 per cent in the same test. Both figures hold at once, and there is no contradiction to explain: the 85 in the name is not a pore size. What the cloth is unambiguously built for is flow: 15,000 litres per square metre per second against the P08's 5,050, roughly three times as much through a square metre of clean material. Flow up by a factor of three, retention at 100 microns slightly up as well — a combination that says plainly who the weave was drawn for.
Whether a road-ridden 790 Duke should have it
Mostly no, and the reason is arithmetic rather than caution. The flow rate is only cashed in when the engine is asking for everything it can get and holding there long enough to matter, and on a naked middleweight on public roads those seconds are few. The price and the inspection rhythm, by contrast, apply every minute the engine runs. If the bike sees track days with any regularity, the case exists. Otherwise the standard P08 is the better specification. Either way, no element inside an unmodified airbox makes a standard 790 Duke noticeably faster; a dry medium offers a restriction that can be reset instead of replaced.
Care and cleaning
Compressed air through the element from the clean side, working outwards — a dry woven cloth gives up its load readily to air, which is part of what makes this specification workable between sessions. Water and a mild detergent when air is not enough, then rinse until clear. Dry in air only, never with heat or flame, and refit dry. Nothing is oiled. The maintenance sheet for PM283S F1-85 is in the Downloads tab.
Fitment & Compatibility
For the KTM 790 Duke built between 2022 and 2026, the only machine this code is catalogued against; the Fitment tab confirms it. The same airbox on the Husqvarna 801 models is served by the standard and dust media instead. A 790 Duke from the 2018–2020 run takes a different code, so check the build year.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- KTM Duke (2022–2026)
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