Sprint Filter P08 F1-85 Air Filter for WorldSBK Racing – MV Agusta F4RR (2013–2015) R189S F1-85-SBK

A rating of 15,000 l/m²/sec describes a steady stream crossing a square metre of cloth on a test bench. The four cylinders of an F4RR do not ask for air in that manner. Valves open and shut, the cylinders take their turns, and what reaches the element is a procession of demands whose peaks stand well above the average the engine is drawing. The figure is real. It describes a capacity, not a moment, and the difference between the two is the whole of what this listing must explain.

Key Features

• WorldSBK-specification framed element in Sprint Filter's racing polyester
• An 85 µm aperture with a rated throughput of 15,000 l/m²/sec
• Roughly twice the filtering surface of other performance filters, inside the standard outline
• Dry medium from first fitting to last, with no oil applied at any point
• Drops into the series housing: nothing repositioned, nothing remapped
• Washable for the life of the machine, two years of warranty from purchase

Average demand and peak demand are separate questions

The airbox volume sitting between the element and the throttle bodies works as a reservoir and smooths a good deal of the unevenness before it reaches the cloth. A good deal is not all of it. What survives is a demand that swings hardest exactly where an engine like this is interesting, high in the rev range with the throttle wide, and it is there rather than at an average that spare throughput has any meaning. Below that the element is nowhere near the limiting item, which is another way of saying an insert filter does not make a standard motorcycle noticeably stronger.

What a loading weave does to the peaks first

As any medium fills, the pressure it costs rises — and it rises faster where the flow is greatest. That is why a tiring element shows itself at the top of the range before anywhere else, and why the change is so easy to miss: the riding most owners do most of the time never asks the question. A cloth that is cleaned back towards its starting condition rather than degrading towards a replacement date keeps that from creeping up unnoticed across an interval. It is a maintenance argument rather than a performance one, and on a machine built in three model years it is the argument that lasts.

Care and cleaning

Nothing is added to this element when it is serviced — that is the point of a dry medium, and it applies every time. Blow compressed air across the clean face of R189S F1-85-SBK, always outward. Follow with water only when the cloth stays loaded: lukewarm, a mild washing-up liquid, and a rinse that continues until the water runs clean. What comes next is simply time in open air. Heat guns, radiators and flames all end the part rather than dry it. Fit it back dry, untreated and the right way round. The full procedure is in the Downloads tab.

Fitment & Compatibility

Specified against the airbox of the MV Agusta F4RR 1000 built from 2013 to 2015. Seven other machines share it, eight altogether: the F4 and F4R of the same years, the F4RC and F4RC LH through 2026, and the Brutale Oro, Brutale RR and Rush.