Sprint Filter P08 F1-85 Air Filter for Racing – Honda CB500F (2019–2026) CM220S F1-85

The 471 cc Honda twin is one of the most raced engines in club motorsport, because it is cheap, plentiful and durable enough that a grid of them stays a grid all season. That is the context this element belongs to. A CB500F prepared for a one-make or clubman class is a standard motorcycle with a short list of permitted changes, and an air filter element is almost always on that list — it is internal, it alters no dimension and it changes nothing that scrutineering measures. The Sprint Filter P08 F1-85 is the version of that list entry built for competition: a dry polyester racing medium flowing 15,000 l/m²/sec at a filtration of 85 microns.

Key Features

• Roughly three times the flow of the standard P08, at 15,000 l/m²/sec
• That flow is bought with a wider aperture: filtration at 85 microns
• Neither a scrutineer nor a sensor will find an oil film, because the polyester runs dry
• Filtering area: about twice what other performance elements provide
• Installation asks for no modification and no remap; the standard CB500F airbox takes it as it is
• Compressed air from the clean side cleans it, and the same element goes back in

Read your own regulations first

Class rules differ, and they differ in detail rather than in spirit. Some series allow any air filter element provided the airbox is otherwise untouched; some specify the standard element and nothing else; some permit the element only in a class that also allows mapping changes. None of that can be decided from a product page, and a part described as legal in general is a part described carelessly. What can be said precisely is what this element is: a replacement medium inside an unmodified standard airbox, with no change to the box, its lid, its inlet or its mounting. Check that description against the rulebook you actually race under.

Why a race element and not a race airbox

The appeal of the CM220S F1-85 for a budget grid is that it buys intake flow without buying anything that has to be declared, fabricated or re-homologated. The airbox stays standard, so nothing needs to be made to fit and nothing changes the bike's road usability if it is ridden to the circuit. It is also washable, which over a season of race weekends is a running cost that stops running: the element is blown through in the paddock and used again, rather than replaced after every dusty meeting.

Care and cleaning

Paddock routine: compressed air from the clean side, worked outwards, refit dry. Between meetings, lukewarm water with a mild detergent, rinsed until the water runs clear, then left in open air until it is dry throughout — no heat, no flame. Oil is never applied to it. The Sprint Filter maintenance sheet is in the Downloads tab.

Fitment & Compatibility

Made for the Honda CB500F from 2019 to 2026. The same CM220S F1-85 covers six machines across the 400 and 500 twin range; the complete list is in the Fitment tab.