Sprint Filter P08 F1-85 Air Filter for Racing – QJ Motor SRT 900 S / SX (2025–2026) PM281S F1-85

An 800 and a 900 take the same racing panel, and so does a Benelli. If the cloth were matched to how much air an engine asks for, that could not be true — a hundred extra cubic centimetres would need a part number of its own. It does not, because an air filter is specified by the housing it seals: sealing face, depth, frame. Which quietly removes one of the commonest reasons for buying this element. Owning the larger of the two engines is not an argument for the faster medium. The cloth has no way of knowing what is downstream of it.

Key Features

• Racing specification: 85-micron dry polyester weave, 15,000 l/m²/sec
• Almost three times the rated throughput of the standard 80-micron panel
• Measured retention of 95.22 % on 100-micron particles
• Goes into the unmodified series airbox of the 900 cc SRT; no remap
• About double the filtering area of a conventional performance element
• Dry from new, never oiled, warranted for two years

What the specification does and does not say

It says the cloth will pass a rated 15,000 l/m²/sec, which is close to three times the standard panel's figure for the identical housing. It says nothing at all about what the engine behind it will do with that, because the rest of the intake — duct, airbox volume, throttle bodies, calibration — is unchanged, and a chain is limited by whichever link is narrowest. Read as a supply figure rather than a promise, the number is honest and useful. Read as a power claim it is neither, and it is worth being plain about that: no slot-in element makes a standard SRT 900 noticeably stronger.

Reasons that do hold up

Track sessions, where the intake is opened often anyway and a very open cloth is serviced between runs. A second panel kept for particular days, since the housing accepts all three media and swapping takes minutes. And, for some owners, simply the wish to run the most open medium the catalogue offers for this airbox with the maintenance discipline that goes with it — a coarser aperture asks for a closer eye on the seal and the lid, not a more relaxed one. Displacement is the one reason that does not belong on that list.

Care and cleaning

Compressed air from the clean face outwards is the standard service, so that the load exits by its entry route instead of being pressed further in. Oily residue comes off with hand-warm water and a little mild detergent, then a proper rinse. Let it dry in moving air and keep every heat source away from it — hot-air guns, radiators, flame — because heat, not dust, is what destroys the material. The PM281S F1-85 is refitted dry and untreated; its maintenance sheet is under the Downloads tab.

Fitment & Compatibility

Made for the airbox of the QJ Motor SRT 900 S and SX, 900 cm³, model years 2025 and 2026, one element per machine. Three machines in total share this code across QJ Motor and Benelli; the complete list is in the Fitment tab on this page.