The facts.
DescriptionThe whole story▼
A flow figure is a statement about capability, not about consumption, and on a single-cylinder engine the difference between those two matters more than usual. A single draws air in one large event every second revolution rather than in the overlapping succession of a multi-cylinder engine, so what the intake has to satisfy is a series of peaks with gaps between them. The average is modest; the peak is not. That is the number an element has to be dimensioned against, and it is why the P08 F1-85's 15,000 l/m²/sec — against the standard P08's 5,050 — describes headroom rather than a promise.
Key Features
- 15,000 l/m²/sec — the highest air flow Sprint Filter offers, and the racing medium's reason for existing
- A different weave from the road medium, not a coarser one: threads from 22 µm, 95.22 % of 100-micron particles retained
- Polyester used dry, never oiled, so nothing can migrate onto the throttle body or sensors
- A direct replacement in the standard airbox — no modification, no remap
- A filtering surface roughly twice the size of other performance filters'
- Washable and reusable, serviced with compressed air from the clean side
Headroom the standard engine already has
The honest consequence is that a standard MT 15 is not short of intake capability, even at its peaks. The standard P08 already provides more than a 155 cc single asks for, which means moving to the racing medium does not release anything — it simply adds capacity that is not being used. The filtration does not suffer — in Sprint Filter's test the F1-85 retains 95.22 % of 100-micron particles against the P08's 93.13 % — but on a machine that is likely to be kept and ridden on public roads for years, the racing medium solves a problem it does not have.
The condition that changes the answer
Once the intake path has been opened up, the exhaust changed and the fuelling adjusted, the peaks rise and the calculation moves. An engine prepared that way and maintained on a racing schedule can use what the F1-85 delivers, and the racing medium becomes a decision taken with the maintenance to support it. Short of that, the choice on this platform is between the standard P08 for general road use and the P14 at 14 microns where the air is dusty — and the airbox accepts any of them without modification. The one thing that does not change with the fabric is the shape of the argument: the range is a line rather than a ladder, with each medium drawn for a different kind of air. Across the three it reads 15,000 l/m²/sec for the F1-85, 80 microns at 5,050 for the P08, and 14 at 1,800 for the P14.
Care and cleaning
Compressed air over the clean side of the PM198S F1-85, directed outwards, and refit it dry. Where a deeper clean is due, lukewarm water and a mild detergent will do it; rinse until the water runs clear, then dry fully in air, never with heat and never with a flame. It is never oiled. The Sprint Filter maintenance sheet is kept in the Downloads tab.
Fitment & Compatibility
Made for the Yamaha MT 15 and MT 155 from 2018 to 2026. The same PM198S F1-85 element covers seven machines across the 125 and 155 range; the complete list is in the Fitment tab.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- Yamaha MT 125 (2021–2026)
- Yamaha XSR 125 (2021–2026)
- Yamaha YZF R125 (2019–2026)
- Yamaha MT 15 /MT 155 (2018–2026)
- Yamaha Vixion R 155 (2018–2026)
- Yamaha XSR 155 (2019–2026)
- Yamaha YZF R15 V3.0 (2017–2026)
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