Sprint Filter P08 Air Filter for Road & Track – Honda CB400F (2019–2026) CM220S

A CB400F outside Japan is almost always an import — a machine built for a licence class that exists in one market and not in the next, ridden by somebody who went looking for it. That changes what a service part has to do. The bike itself is ordinary to maintain; the awkward part is supply, because a dealer stocks consumables for the models sold on his own forecourt and not for the one that arrived on a boat. The Sprint Filter P08 CM220S answers that by not being a consumable at all: a dry polyester element with roughly double the filtering surface of other performance filters, cleaned at service rather than ordered again.

Key Features

• Nothing is oiled at any stage, which is why nothing off this element can end up on a sensor or a throttle body
• Roughly twice the filtering area of other performance elements, out of the same airbox opening
• Woven polyester thread from ø 22 microns, held to a calibrated aperture — a fabric, not pressed pulp
• Goes in where the standard element came out: nothing modified, nothing remapped, homologation untouched
• Compressed air is the normal service, and the element that comes out is the one that goes back in
• Covered for two years, counted from the date of purchase

The part you no longer have to source

Every paper element is a small dependency: a number to look up, a shelf to hope it is on, a wait if it is not. On an imported machine that dependency is the thing most likely to bite, usually at the least convenient moment. A washable element removes the transaction entirely. It is blown through with compressed air at a service, washed when a hard season has earned it, and refitted the same afternoon. Sprint Filter designs the P08 to last the life of the motorcycle, so the ordering stops after the first one.

An element dimensioned for the whole family

The CM220S is not a one-model part. The same element serves the 400 and 500 twins alike, six machines from one airbox design, which is the practical reason it stays in production and easy to find long after any single variant has left a showroom. It also means the medium was specified with the largest engine in that family in mind, not the smallest — the 399 cc twin is asking rather less of it than the element is built to give.

Care and cleaning

Never oil it, never dry it with heat or a flame, and never fit it damp. What it does want is compressed air from the clean side, directed outwards; where a season has left more behind than air will shift, lukewarm water with a mild detergent, rinsed until the water runs clear, then open air until it is dry right through. The Sprint Filter maintenance sheet sits in the Downloads tab.

Fitment & Compatibility

Made for the Honda CB400F 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.