The facts.
DescriptionThe whole story▼
Three media are catalogued for this airbox, and their prices rise in the same order as their flow ratings: the T12 at 560 l/m²/sec, the standard P08 at 5,050, and the racing panel on this page at 15,000, listed at about two and a half times the standard element. Read that column alone and it looks like a quality ladder with this product at the top. It is not one. Nor is it a filtration ladder: the 85 in this panel's name is not a micron figure, and in the maker's 100-micron test it retained slightly more than the standard P08. Price is tracking throughput, not filtration.
Key Features
- Dry woven polyester, threads from 22 µm in diameter, rated at 15,000 l/m²/sec
- The fastest-flowing medium in the range, and according to Sprint Filter the most widely used filter in MotoGP and WorldSBK
- Retention measured at 95.22 % of 100-micron particles, against 93.13 % for the P08
- Standard frame and sealing face: no airbox modification, no recalibration
- Roughly twice the filtering fabric of an ordinary performance element
- Washed with compressed air and refitted; two-year warranty from purchase
Faster-flowing, and yet it held back more
The two published retention results for these cloths do not follow the flow figures either. Tested against 100-micron particles, this weave held 95.22 % and the standard one 93.13 %, even though it passes three times the air. There is no trick in that: the 85 in the name was never an aperture, and the racing cloth is a different construction, woven from polyester threads from 22 µm in diameter. The point to carry away is narrow but useful — a name is not a rating, a percentage describes one test, and neither is a score. For genuinely dirty air, the fine end of the range, here the 7-micron T12, remains the answer.
Who the fast cloth is for
Riders whose SRT 800 sees circuit sessions and who service the intake as part of the routine rather than once a season. That is the context the specification was drawn for, and it comes with an obligation: such a high rated throughput means the seal, the lid and the inspection interval matter more, not less. What it does not come with is extra performance on a standard machine. No slot-in element makes an unmodified SRT 800 noticeably stronger, this one included. It offers a very high rated throughput and a restriction that returns to its own baseline at every wash — nothing beyond that.
Care and cleaning
Blow it through from the clean side with compressed air so that whatever the weave caught leaves by the way it came. A film that air will not lift comes away under hand-warm water with a small amount of mild detergent, followed by rinsing until nothing more runs out of the cloth. Drying happens in ambient air only, never against heat or flame, and the PM281S F1-85 is refitted dry and untreated. Its maintenance sheet is in the Downloads tab on this page.
Fitment & Compatibility
For the airbox of the QJ Motor SRT 800 in plain, S, SX and X form, model years 2024 to 2026, one element per machine. Three bikes take this code across QJ Motor and Benelli; check the fitment list on this page against your own year.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- Benelli Leoncino (2024–2026)
- QJ Motor SRT 800/ S/ SX/ X (2024–2026)
- QJ Motor SRT 900 S/ SX/ (2025–2026)
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