The facts.
DescriptionThe whole story▼
A full fairing keeps the rider dry and does rather less for the airbox. Water finds its way in on any motorcycle ridden in real weather — as spray off the road, as damp air on a cold morning, as the fine mist that hangs about after rain has stopped. What matters is what the filter does about it. Paper absorbs, swells and softens at the pleat folds, and a soaked element does not recover the shape it started with. The Sprint Filter P08 CM220S is woven polyester, dry by design: it gets wet, it dries, and it carries on with the same aperture it had before.
Key Features
- Water and fuel vapour have no oil to strip out of it, because the polyester medium works dry
- The area doing the filtering is around twice that of other performance elements
- Thread of ø 22 microns and upwards, woven to a calibrated aperture
- Wet or dry, the structure is the same: it does not swell and there are no pleats to collapse
- A straight swap in the standard airbox — nothing modified, nothing remapped
- The warranty runs two years from the date of purchase
Rain is a filter problem before it is a rider problem
The airbox is fed with air that has just travelled past a wet front wheel, and no intake is perfectly sealed against that. On an oiled cotton filter, water is worse than dirt, because it takes some of the oil with it and leaves the medium filtering on a film that is no longer evenly there. On paper it is a structural matter — a damp element restricts more, and a repeatedly damp one keeps some of that restriction for good. A dry synthetic weave has neither failure mode. It is washed in water on purpose, so being rained on is not an event.
What the element is actually worth on a sports 400
Being honest about it: a filter does not make a homologated 399 cc twin meaningfully faster, and nobody should buy one expecting that. What it does is hold the intake restriction steady between services instead of letting it creep up as the miles accumulate, and give back a part that is cleaned rather than replaced. On a bike ridden hard on dry days and used through the wet ones as well, that consistency is the point.
Care and cleaning
Water is not the enemy here; heat is. Wash the element in lukewarm water with a mild detergent whenever it deserves it, rinse on until the water runs clear, then leave it in moving air until every thread is dry — never over a heat source, never near a flame. Day to day, compressed air from the clean side outwards is enough. It goes back in dry, and it is never oiled. The Sprint Filter maintenance sheet is in the Downloads tab.
Fitment & Compatibility
Made for the Honda CBR400R from 2019 to 2026. The same CM220S element covers six machines across the 400 and 500 twin range; the complete list is in the Fitment tab.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- Honda CB400F (2019–2026)
- Honda CB400X (2019–2026)
- Honda CBR400R (2019–2026)
- Honda CB500F (2019–2026)
- Honda CB500X (2019–2026)
- Honda CBR500R (2019–2026)
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