The facts.
DescriptionThe whole story▼
Road dust is seasonal. For most of the year a naked like the Seiemmezzo STR breathes ordinary road air. Then summer comes, the fields are harvested, the road works start, and every lorry ahead leaves a fine grey cloud. The P14 is made for that air. It filters at 14 µm instead of the standard weave's 80 and gives up flow to do so, a trade that makes sense for the months when dust is the condition and much less sense when it is not.
Key Features
- Special nonwoven, used dry, filtering down to 14 µm
- 1,800 l/m²/sec of rated flow, a little over a third of the P08
- Designed for demanding conditions: dust, dirty urban air, long distances
- Direct fit in the STR's standard airbox, without modification or remap
- Never oiled; restored with compressed air and refitted
- Two-year warranty; Sprint Filter designs it to last the life of the motorcycle
Fourteen microns and what they cost
The finer mat stops particles that would pass through the P08's weave, and that is the entire point of fitting it. The price is paid in flow: 1,800 litres per square metre per second against 5,050. On the road the twin draws only a small part of either figure most of the time, so the trade costs little and shows only near full throttle, high in the revs. The second cost is time. A finer filter loads faster, so in a dusty summer it wants a look every few weeks rather than once a year. It does not make the engine stronger, as nothing in an unmodified airbox does, and it costs about three quarters of the standard element.
When the P08 is the better choice
If the STR is ridden on clean roads and in town, the P14 has little to catch and the standard P08 is the better element. The same goes for anyone who regularly spends time high in the rev range. One sensible pattern is two elements for one box: the P14 for the dusty months, the P08 for the rest of the year. Both fit the same housing in the same way, and swapping them is a matter of opening the airbox.
Care and cleaning
Take SM297P14 out and blow through it with compressed air from the clean side towards the dirty side, covering the whole mat. When it is heavily loaded, wash it in lukewarm water with a mild detergent and rinse until the water stays clear. Dry it slowly at room temperature in moving air, with no heat source of any kind, and refit it dry with nothing applied. The maintenance sheet is in the Downloads tab.
Fitment & Compatibility
For the Moto Morini Seiemmezzo STR of 2023 and 2024. The P14 on this code is listed for three machines: the STR, the Seiemmezzo SCR and the Calibro / Calibro Bagger. The X-Cape models are not on it. The Fitment tab has the details.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- Moto Morini Seiemmezzo STR (2023–2024)
- Moto Morini Seiemmezzo SCR (2023–2026)
- Moto Morini Calibro / Calibro Bagger (2025–2026)
- Moto Morini Calibro 700 (2025–2026) · own page →
- Moto Morini Calibro Bagger 700 (2025–2026) · own page →
- Moto Morini Seiemmezzo SCR 650 (2023–2026) · own page →
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