The facts.
DescriptionThe whole story▼
There is a far larger restriction in this intake than any filter, and the rider operates it with his right hand. A throttle plate a quarter open is a tighter constriction than any air filter ever built, which is why the medium in the airbox only becomes a measurable share of the total once the throttle is out of the way.
Key Features
- Racing medium: dry polyester woven from threads from 22 µm in diameter, rated at 15,000 l/m²/sec of flow
- A capacity figure, not a delivery figure — it describes what the material can pass under test
- The standard element for this housing is rated 80 µm at 5,050 l/m²/sec and costs far less
- Dry throughout, never oiled, so nothing migrates onto the throttle body or the sensors behind it
- Direct exchange for the series panel; the airbox and the mapping are untouched
- Roughly twice the area of an ordinary performance element, cleaned and reused, two years of warranty
Where a filter medium is even visible
Restriction accumulates along the intake, but the terms are wildly unequal and they shift with throttle position. At small openings the plate dominates so thoroughly that changing media alters almost nothing anywhere behind it. The element's share climbs only as the throttle approaches fully open with the engine drawing hard — and on a road-registered 350 that is a thin slice of any year, arriving a few seconds at a time, at speeds most roads do not invite. A medium rated at 15,000 l/m²/sec is specified for machines that live inside that slice rather than visiting it.
The part of the job that never switches off
The weave has no operating condition. Whatever the cloth holds back, it holds back while idling in traffic, while cruising at a steady speed, and during the one full-throttle exit of the afternoon alike. That is where you might expect the price of the extra flow to show up, and on the manufacturer's own figures it does not: the 85 is part of the name rather than a pore size, and retention on 100-micron dust is measured at 95.22 %, ahead of the standard element's 93.13 %. Sprint Filter quotes retention for that particle size only, so neither figure speaks for the finest dust. The asymmetry that remains is one of money: the benefit is occasional, the outlay is paid in full, and no slot-in element makes a standard motorcycle faster to begin with. For a ZT 350-V the standard specification asks a great deal less for capacity that is genuinely usable.
Care and cleaning
Hold compressed air to the clean side and blow outward through the material; the load then leaves by the route it entered. Greasy deposits need lukewarm water and a mild detergent, and the rinse continues until the water runs off clean. From there the drying is done by circulating air at ambient temperature only, never by a heat gun, an oven or a flame, and the SM277S F1-85 is refitted dry and bare. Sprint Filter's maintenance sheet can be found under the Downloads tab.
Fitment & Compatibility
The racing element for the Zontes ZT 350-V, catalogued 2020 to 2026. Eight further Zontes machines sit behind the same code across three capacity classes. Match the code first and the build year second.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- Zontes ZT 250-R (2019–2021)
- Zontes ZT 310-R (2021–2023)
- Zontes ZT 310-T (2021–2023)
- Zontes ZT 310-X (2021–2023)
- Zontes ZT 350-R (2020–2026)
- Zontes ZT 350-T (2020–2026)
- Zontes ZT 350-X (2020–2026)
- Zontes ZT 350-GK (2020–2026)
- Zontes ZT 350-V (2020–2026)
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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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