The facts.
DescriptionThe whole story▼
Read down the list of parts consumed by a full service and almost every line is unavoidable: oil ages, brake fluid takes on water, a spark plug wears its electrodes away. The air filter is the odd one out. A pressed pulp element is discarded not because it has been used up but because it cannot be brought back — the fibres swell once wetted, dirt works into the mat rather than sitting on it, and washing leaves it worse than it was. On a machine like the GB350C, bought to be kept rather than traded on, that is the one item on the list worth changing the category of. The Sprint Filter P14 SM289P14 is cleaned and refitted instead, at 14 micron filtration where the standard P08 weave works at 80.
Key Features
- Cleaned with compressed air as a matter of routine, washed with water and mild detergent when it has earned one
- The medium is a dry special non-woven rated at 14 microns; oil never touches it
- Flow is rated 1,800 l/m²/sec where the P08 sits at 5,050 — the air surrendered is the price of the finer retention
- Filtering surface about double what other performance elements offer
- Fits the standard airbox directly: nothing to modify, nothing to remap, homologation untouched
- Meant to last as long as the motorcycle, and warranted for two years from the purchase date
The service item that stops being a consumable
A washable element changes what maintenance means at the airbox. Instead of a part ordered, fitted and thrown away on a schedule, there is a part removed, cleaned and returned to its own starting condition — the same condition each time, rather than a slow drift that only becomes obvious once a new element makes the bike feel different for a fortnight. Nothing is added to the medium during the service, which is why nothing can leave it later and reach the metering hardware downstream.
Why the finer medium suits this one
Filtration and flow are opposite ends of one lever. The GB350C is the least hurried machine in the family: low seat, relaxed gearing, an engine tuned for manners rather than for a figure at the top of the rev range. It works in the part of the rev range where the standard weave's 5,050 l/m²/sec was never being called on, so the 1,800 of the non-woven is paid in a currency this engine does not spend. That is a genuine argument, not a promise of performance — no drop-in element makes a standard 350 quicker. The cost is real too: a tighter medium collects more and asks to be inspected sooner.
Care and cleaning
The routine is compressed air, applied to the clean side and blown outwards. A wash is available whenever it is deserved: lukewarm water, a mild detergent, rinsing until the water runs clear, then open air until the element is dry all the way through — never with heat, never near a flame. Refit it dry. The maintenance sheet for the SM289P14 is in the Downloads tab.
Fitment & Compatibility
Made for the Honda GB350C from 2024 to 2026. The same SM289P14 element covers five machines built around this 350 cc single; the complete list is in the Fitment tab.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- Honda CB350 (2021–2026)
- Honda CB350RS (2020–2026)
- Honda GB350C (2024–2026)
- Honda GB350 / GB350S (2021–2026)
- Honda H’ness CB350 (2020–2026)
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