Sprint Filter P08 F1-85 Air Filter for Racing – Kawasaki ZH2 (2020–2026) PM197S F1-85

The usual advice about the F1-85 is easy to give and usually right: its 15,000 l/m²/sec only matter if the engine ever asks for that much air, and a road bike almost never does. The ZH2 makes the advice harder. Air demand on a supercharged engine is not set by displacement and revs alone — the compressor raises the mass of air swallowed at a given engine speed, and the panel feeding it feels the difference. So the flow half of this element's specification is less rhetorical here than on a naturally aspirated naked. The other half has not moved at all, and that is where the decision sits.

Key Features

• Dry woven polyester in the F1-85 racing specification, used without oil of any kind
• 85 microns of filtration at 15,000 l/m²/sec — the highest flow rate published
• Measured retention of 95.22 % of 100-micron particles, compared with 93.13 % for the P08
• Roughly double the filtering area of other performance elements
• Fits the unmodified series airbox in the paper panel's place — no cutting, no remap
• Cleaned with compressed air and refitted; two years of warranty from purchase

Where the flow argument gains ground

A medium's flow rating is a ceiling per unit of area and time, and ceilings only matter when demand approaches them. That is why the racing cloth is pointless on most road machines: they never get near it. Forced induction moves the demand curve upward rather than merely rightward, so the ZH2 arrives closer to the question than its displacement suggests. Even so: the PM197S F1-85 will not make a series ZH2 noticeably stronger, because a filter cannot give an engine more than the restriction it took away.

Where it loses ground again

The same machine argues against the choice with equal force. Opening the weave to 85 microns is paid for in every second the bike runs, including commuting hours, while the flow it buys is collected only in the moments of full demand. A racing specification also assumes a racing rhythm of inspection — the element blown through between sessions, not once a year with the valve clearances. For a ZH2 ridden on roads and serviced annually, the P08 at 80 microns and 5,050 l/m²/sec is the better setting of the same trade.

Care and cleaning

Dry servicing throughout: an air line held against the clean face and directed outwards restores the cloth in normal use. If a wet track day or a salted road has loaded it more heavily, wash it in lukewarm water with a little mild detergent, rinse until the water runs clear and let it dry completely in moving air — never with heat, never over a flame. Refit it dry with the seal sitting evenly. The maintenance sheet is in the Downloads tab.

Fitment & Compatibility

Listed for the Kawasaki ZH2 built from 2020 to 2026, the only machine on this code; the single fitment entry appears under the Fitment tab. The airbox is catalogued with the P08 and the 7-micron T12 as well, so the whole span of the range is available for one motorcycle: a line of settings, not a ladder of quality.