The facts.
DescriptionThe whole story▼
Every other wear item on a CB750 Hornet announces itself. Oil turns dark on the dipstick, pads start to squeal, tyres run out of tread where anybody can see it, and the dash keeps its own list of what falls due. The air element does none of that. It gets slowly worse across tens of thousands of kilometres with no warning light, no line on any roadworthiness test, and no noise a rider could put a finger on. It is the scheduled job most often pushed back, simply because nothing on the motorcycle ever raises it.
Key Features
- One layer of woven polyester, run dry from the first kilometre — no oil to migrate onto the sensors
- Rated at 80 µm with a flow of 5,050 l/m²/sec, the medium Sprint Filter builds for road and track use
- The polyester thread starts at ø 22 microns; the opening between threads comes from the weave, not from pressed pulp
- Around double the working cloth of the usual performance element, so the same air crosses a less crowded surface
- Goes into the standard housing in the paper panel's place — nothing cut, nothing remapped
- Serviced with air instead of replaced with money, and covered by Sprint Filter for two years
A service item with no external trigger
Nothing in the way this motorcycle is built will ever remind you. The intake sits under the tank and out of sight, the injection compensates for a rising restriction long before anything reaches the throttle hand, and a test lane has no reason to look inside an airbox. So the element is judged by the calendar or not at all. What a cleanable part changes is not the engine — a drop-in filter does not make a standard Hornet noticeably stronger, and anyone promising otherwise is selling a different story — but the reason to open the airbox in the first place.
What a lifetime element does to the habit
Once the panel that gets binned is replaced by one that gets washed, the task changes shape. There is nothing to order, so nothing waits on a parts counter, and the work happens on the afternoon you choose rather than the week a box arrives. That counts for more on a bike bought as somebody's first proper middleweight, where an airbox can otherwise stay shut for years. The benefit is not output: it is an intake restriction that stays close to where it started across a whole service interval, instead of drifting upward unseen between replacements.
Care and cleaning
Most services need nothing but compressed air, held against the clean face so the dirt leaves the way it arrived. After a wet or salted winter, wash the SM247S in lukewarm water with a little mild washing-up liquid and rinse until the water runs clear. Let it dry in moving air at its own pace, away from heat guns, radiators and any flame, because heat ruins polyester. It goes back in dry and untreated. The Sprint Filter maintenance sheet is in the Downloads tab.
Fitment & Compatibility
Cut for the airbox of the Honda CB750 Hornet built from 2023 to 2026. The element covers two machines in all, the second being the XL750 Transalp of those years. Both are listed in the Fitment tab.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- Honda CB750 Hornet (2023–2026)
- Honda XL750 Transalp (2023–2026)
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Measure your head circumference about one centimetre above your eyebrows and compare it with the size chart on this page. Between sizes? Choose the smaller one — the padding beds in with use.
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Most of our touring and sport helmets are Pinlock-ready and many include the insert. Check the ‘What’s in the box’ section on this page for this model.
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Take out the washable lining and hand-wash it in lukewarm water. Clean the shell and visor with a soft cloth and water only — never solvents.
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