Sprint Filter P08 F1-85 Air Filter for Racing – Kawasaki ZX-4RR (2023–2026) PM164S F1-85

Technical inspection is a conversation about specifics, and a part described in general terms is no use in it. So here is the precise position of this element on a Kawasaki ZX-4RR. It is a replacement filtering medium that sits in the standard airbox. The box is unchanged: same lid, same inlet, same volume, same mounting, same fasteners. Nothing is cut, drilled, relocated or repositioned, no mapping is altered, and the original element can be refitted with the same tools that removed it. What differs is the fabric — a dry polyester racing medium flowing 15,000 l/m²/sec at a filtration of 85 microns, against the standard P08's 5,050 and 80.

Key Features

• Standard airbox, unmodified — nothing cut, nothing repositioned, no remap
• Washable and reusable; compressed air from the clean side between runs
• Dry polyester, never oiled — no oil film for an inspector or a sensor to find
• Racing medium: 15,000 l/m²/sec of air flow at a filtration of 85 microns
• Filtering surface roughly double that of a normal performance filter
• Two years of warranty, on a part meant to last the life of the bike

Read the rulebook, not the product page

Class regulations differ in exactly this kind of detail. Some series permit any element inside an otherwise standard airbox; some specify the original part and nothing else; some allow the element only in classes that also permit mapping changes. None of that can be settled here, and a product described as generally legal is a product described carelessly. The useful thing a supplier can offer is an accurate description of what the part is and does — which is above — so that it can be checked against the regulations that actually apply.

Why dry matters in a paddock

The absence of oil is worth its own paragraph on a race bike. An oiled element has to be cleaned, dried, re-oiled and left to distribute before it goes back in, which does not fit into the hour between sessions and is easy to get wrong under time pressure. Too much oil ends up downstream; too little leaves the medium doing less than it should. The F1-85 removes the whole procedure: compressed air, refit, done. There is no judgement involved and nothing to run out of. That matters because the hour between sessions is not really an hour — it contains tyre pressures, fuel, a look at the brakes and a conversation about the last run. Any job that reliably takes ten minutes gets done; any job that might take forty gets postponed until it is no longer optional.

Care and cleaning

A compressor and nothing else: air from the clean side, outwards, the element back in dry, finished between sessions. At the end of a meeting it gets lukewarm water and a mild detergent, a rinse until the water runs clear, then a full air dry with no heat or flame. It is never oiled, which is a consumable fewer in the van. The Sprint Filter maintenance sheet is in the Downloads tab.

Fitment & Compatibility

Made for the Kawasaki ZX-4RR from 2023 to 2026. The same PM164S F1-85 element covers eleven machines sharing this airbox; the complete list is in the Fitment tab.