The facts.
DescriptionThe whole story▼
An airbox is one of the few places on a modern motorcycle an owner can still open, look inside and close again without a diagnostic tool or a torque figure that carries consequences. On the CFMOTO NK 300 that counts for something, because it is the only spot where the state of a consumable can be judged by eye instead of by a page in the service book. What decides whether anyone actually looks is whether looking commits you to a purchase — and with a washable element it does not.
Key Features
- Inspected, cleaned and refitted without buying anything
- Single layer of dry woven polyester: 80 µm, rated at 5,050 l/m²/sec
- About double the filtering area of a typical performance element
- No oil anywhere in its service routine, and none to wash back out
- Fits the standard NK 300 airbox in place of the paper panel; no remap needed
- Two-year warranty; designed to remain in the machine for its working life
The value of being able to look
A disposable panel makes inspection pointless in practice. Opening the box tells you the element is dirty, the only answer available is a part you do not have, and so the sensible move is to leave it shut until the schedule comes round. Ten minutes with no purchase attached changes that habit completely. Riders who can clean what they find do check, and after a couple of seasons they know their own conditions well enough to service the intake by observation rather than by calendar.
Flow, and how it is quoted
The figure of 5,050 l/m²/sec is a rate per square metre of cloth, which is why the second specification matters as much as the first: the P08 carries roughly twice the working area of a usual performance element, and area multiplies the rate. A 300 single asks for a modest share of what that adds up to. The consequence is not extra output — a drop-in filter does not make a standard NK 300 noticeably quicker, and neither the airbox nor the mapping changes — but reserve. Dust settling across a large area moves the restriction less than the same dust on a small one.
Care and cleaning
Cleaning is also the inspection. Hold the panel up to a light first and see where it has loaded, then work a compressed-air line across the clean face so the deposits leave through the side that gathered them. Water is the fallback for oily residue: lukewarm, a little mild detergent, rinsed out well. Dry it in air alone, never near heat or a flame, and refit it only once it is dry through. The maintenance sheet for the PM227S is in the Downloads tab.
Fitment & Compatibility
Cut for the airbox of the CFMOTO NK 300 as built in 2019 and 2020. Three CFMOTO models take this element in the Sprint Filter listing; check the compatibility list on this page against your own machine.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- CFMOTO NK 250 (2018–2019)
- CFMOTO CL-X (2023–2026)
- CFMOTO NK 300 (2019–2020)
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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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