Sprint Filter P08 F1-85 Air Filter for Racing – QJ Motor SRK 650 RR (2025–2026) SM282S F1-85

By Sprint Filter's own account, its filters are the most widely used in the MotoGP, Moto3, World Superbike, Supersport and Superstock championships. That is the manufacturer describing itself rather than an independent count, and it deserves saying with the attribution attached. It also deserves deflating, because no paddock runs a road-registered 650 on its series airbox. What can genuinely cross from those grids to an SRK 650 RR is the cloth itself and the habit of servicing it often — not the results, and not the machinery it was fitted to there.

Key Features

• Dry woven polyester with an 85-micron aperture, rated at 15,000 l/m²/sec
• The highest-flowing medium Sprint Filter catalogues for this airbox
• Retention measured at 95.22 % of 100-micron particles
• Listed at about two and a third times the standard panel for this housing
• Series frame and sealing face, so no airbox work and no recalibration
• Never oiled, serviced with air, two years of warranty from purchase

The cloth, in the figures that are published

85 microns of aperture, a rated 15,000 l/m²/sec, and 95.22 % retention measured on 100-micron particles. Set against the standard element for the same housing at 80 microns, 5,050 l/m²/sec and 93.13 %, the pattern is plain enough: the racing weave is the more open of the two and passes close to three times as much air per square metre each second. Every one of those numbers describes the material, and none of them describes an engine. What the engine does is set by the intake tract, the throttle bodies and the calibration, and this is a panel inside that system rather than a change to it.

The habit is the transferable part

A very open cloth rewards being looked at often. The seal, the lid and the state of the airbox floor matter more with a coarse aperture than with a fine one, and the discipline of checking them between sessions is the genuinely useful thing borrowed from racing use. What is not borrowed is power: no slot-in element makes a standard SRK 650 RR noticeably stronger, and the honest gain here remains a low intake restriction that comes back to its starting point every time the element is washed instead of drifting upward until it is thrown away.

Care and cleaning

Compressed air, applied to the clean face and worked outwards, so that trapped particles leave along their entry route. Where a film has settled that air will not shift, hand-warm water with a small amount of mild detergent will, followed by rinsing until the water runs clear. Dry it in moving air and nowhere near heat — no gun, no radiator, no flame — then refit the SM282S F1-85 dry and untreated. The maintenance sheet for the element is in the Downloads tab on this page.

Fitment & Compatibility

Made for the airbox of the QJ Motor SRK 650 RR, 650 cm³, model years 2025 and 2026, one element per machine — the only machine listed for this racing code. The fitment list is reproduced in the Fitment tab.