The facts.
DescriptionThe whole story▼
There is no racing class for the CFMOTO NK 800. No cup, no championship, no grid of them anywhere — and Sprint Filter catalogues a racing element for it regardless. That is not a contradiction and it is not a hint either. Media are listed against housings: once the tooling for this airbox exists, every medium in the range can be cut to that shape, and a price list records what can be supplied rather than what anyone asked for. Reading a listing as a recommendation is the mistake this page exists to prevent.
Key Features
- Dry polyester woven from 22 µm threads, with a flow figure of 15,000 l/m²/sec
- Measured at 95.22 % retention against 100-micron test particles
- Identical shape and fit to the standard element, straight into the series airbox with no remap
- Roughly double the filtering area of other performance elements
- Dry for its whole life, never oiled, regenerated with compressed air
- Built for the motorcycle's service life and warranted two years from purchase
The retention figure, read properly
Ninety-five point two two per cent against the standard weave's ninety-three point one three is a win for the racing cloth, and it only looks puzzling if the 85 in its name is read as a mesh size, which it is not. The weave is made from polyester threads from 22 µm in diameter and simply flows more and retains more at the size tested. Both figures come from a comparison using 100-micron particles, though, and one test at one particle size does not rank two media across the range.
What would have to be true
The extra flow is only drawn on with the throttle wide and the engine near the top of its band, so the buyer who benefits is one whose machine spends real time there — a closed course, track days taken seriously, and an airbox opened on a race rhythm rather than a road one. Against that it costs a little over two and a half times what the standard element does and asks for the airbox to be opened far more often than ordinary use would ever call for. And neither element adds power to a standard NK 800; nothing that drops into the series box does.
Care and cleaning
Blow it out with compressed air from the clean face outwards, and on track do it between sessions rather than between services. Film and residue come off in lukewarm water with a mild detergent, rinsed until the run-off is clear. It dries slowly in moving air and never with heat or a flame, and the PM273S F1-85 is refitted dry with nothing applied to it. The maintenance sheet is in the Downloads tab.
Fitment & Compatibility
Listed for the CFMOTO NK 800 of 2023 to 2026, one element per machine, and for no other model. The standard weave and the 14-micron mat for this airbox carry the same single-machine fitment.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- CFMOTO NK (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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