The facts.
DescriptionThe whole story▼
Fit the SM219S F1-85 to a standard CB300R this afternoon and one question follows immediately: how would anyone find out whether it changed anything? A stopwatch will not resolve it. A rolling road on another day, at a different air temperature and humidity, cannot separate a few percent of intake flow from its own scatter. The forward half of this trade, 15,000 l/m²/sec against the 5,050 of the standard P08, is beyond an owner's ability to detect on a standard engine. There is no backward half to set against it: the 85 in the name is not an aperture, and in the manufacturer's own test the F1-85 holds back slightly more than the P08. What remains is a benefit nobody can confirm.
Key Features
- Sprint Filter racing fabric: flow rated at 15,000 l/m²/sec, woven from threads of 22 µm and up
- Dry polyester construction; carrying no oil, it has none to give to the intake tract
- Much greater filtering area than the performance elements it is usually compared with
- Replaces the standard element directly, with the airbox and the engine mapping untouched
- Reusable for the life of the bike; a compressor takes the place of a spare part
- Covered by a two-year warranty from purchase
The test that cannot be run
This matters because intake parts are usually bought on expectation. A rider fits one, rides away and reports a change, and on a standard single of this size no change of that magnitude is available to be felt. The element was never the restriction. Air reaches the airbox through a fixed inlet, leaves through a fixed throttle body and is metered by a map written around both. Raising the rating of the fabric in the middle of that chain does not raise what the chain delivers. On an engine that has been opened up, with the rest of the intake path with it, the picture changes; that is the machine this element was catalogued for.
What is certain instead
What is certain can be read off the data sheet without a test session: the F1-85 passes no more dirt than the P08 — in Sprint Filter's comparison it retains 95.22 % of 100-micron particles against 93.13 % — and a road-registered CB300R covers a great many kilometres of ordinary air between services on either. That is the calculation to make before ordering: an effect that cannot be measured, bought for an engine with no use for it. For most owners the standard P08 at 80 microns and 5,050 l/m²/sec matches how the bike is used, and on dusty roads the P14 at 14 microns and 1,800 l/m²/sec matches it better still. Finer holds more and flows less. That is a trade, not a ranking.
Care and cleaning
It is cleaned from the inside out: a compressor held to the clean face lifts the dirt off the dirty one, and the SM219S F1-85 goes back completely dry. If more is needed, lukewarm water and a mild detergent will do it, rinsed until the water is clear and left in open air until the fabric has dried through. Heat sources and naked flames stay away from it. At no stage does it receive oil. The Sprint Filter maintenance sheet is in the Downloads tab.
Fitment & Compatibility
Made for the Honda CB300R from 2018 to 2026. The same SM219S F1-85 element covers four machines in the Neo Sports Café family, 125 to 300; the full list is in the Fitment tab.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- Honda CB125R (2018–2026)
- Honda CB150R (2018–2026)
- Honda CB250R (2018–2026)
- Honda CB300R (2018–2026)
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