The facts.
DescriptionThe whole story▼
Plenty of people reach this page already running a Sprint Filter. The standard P08 element for the Bimota KB4 has the same fit, the same dry polyester construction and the same washing routine, so the racing version looks like the obvious next rung. It is not a rung. It is a move sideways, and the direction deserves to be stated plainly: the PM111S F1-85 uses the P08 F1-85 medium, which flows 15,000 l/m²/sec instead of 5,050. Air flow is what you gain. Retention is not what you spend: the 85 is not a pore size, and in the manufacturer's test the F1-85 keeps back 95.22 % of 100-micron particles to the P08's 93.13 %.
Key Features
- Dry racing polyester, woven from threads of 22 µm and up, with 15,000 l/m²/sec behind it
- For road use the balanced choice is the standard P08: 80 microns, 5,050 l/m²/sec
- Either medium carries roughly double the filtering surface of other performance filters
- No oil is used on it, so no film migrates onto the intake sensors or throttle bodies
- Fitted in the standard airbox where the original element sat — no modification, no remap
- Washed rather than replaced, and warranted two years from the date of purchase
When the sideways move is worth making
A KB4 is not a commuter, and the argument does not have to be forced here the way it would on a touring machine. This is a small-series sporting motorcycle built around a strong four-cylinder engine, ridden on chosen days at a pace that puts the throttle wide open high in the rev range. That is precisely the operating point where a flow ceiling stops being theoretical. Ride it that way, and the extra air is at least available to be used — which is more than can be said for the same element in a bike that spends its life at a third of the revs.
The condition that comes with it
Racing media are chosen for engines that are built to breathe and serviced by operating hours: stripped, measured and given fresh oil far more often than any road schedule demands. That is where the extra air is actually drawn on. No shorter inspection cycle is needed to cover the F1-85 itself, because it filters no coarser than the P08. An owner who intends to run the KB4 mostly on the road at its standard mileage intervals is simply buying flow the engine seldom asks for, and the honest recommendation is to stay with the P08 — or, if the roads are genuinely dusty, to go the other way entirely to the P14 at 14 microns and 1,800 l/m²/sec. Neither choice is a downgrade. Each of the three suits a different kind of riding.
Care and cleaning
Compressed air from the clean side, directed outwards, is the routine, and the PM111S F1-85 goes back into the airbox dry. When more is called for: lukewarm water, a mild detergent, a rinse until the water runs clear, then open air until the last of the moisture has gone. Never heat, never a flame. Oiling is not part of the procedure at either end. The maintenance sheet is in the Downloads tab.
Fitment & Compatibility
Made for the Bimota KB4, 2021 to 2026. The same PM111S F1-85 element covers five machines built around this airbox, including the KB4RC and the Kawasaki models that share the engine; the complete list is in the Fitment tab.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- Bimota KB4 (2021–2026)
- Bimota KB4RC (2022–2026)
- Kawasaki Ninja 1000 SX (2020–2026)
- Kawasaki Z1100 (2026)
- Kawasaki Ninja 1100 SX (2025–2026)
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