The facts.
DescriptionThe whole story▼
The words in this product title describe conditions, not a machine. Dusty is something a road is, and roads differ by region, by season and by what happened on them last week: a resurfacing crew, a dry spell, a stretch of farm track on the way home. Two Hunter 350s built in the same month can therefore want different filter media, and neither owner is wrong. The CM231P14 is the answer for the one whose air carries grit. For the one riding clean tarmac, the standard woven element for this same airbox remains the sensible fit.
Key Features
- Dry non-woven fabric, filtering at 14 microns with a rated flow of 1,800 l/m²/sec
- The finest of the three media Sprint Filter lists for this Royal Enfield airbox
- Oil free from first fitting to last, with nothing to soak in and nothing to wash back out
- About twice the filtering surface of other performance elements, inside the standard box
- Direct replacement for the factory panel: no modification, no adaptor, no remap
- Cleaned rather than replaced, with two years of warranty from the date of purchase
Three media, one housing
Sprint Filter catalogues three elements for this box and they are not a ladder. Rated flow runs from 15,000 l/m²/sec at the racing end, through 5,050 for the standard woven medium, down to the 1,800 of this one. The racing F1-85 carries no pore rating in its name, since the 85 is not a size, but between the standard medium at 80 microns and this one at 14, each step towards a finer rating is paid for in air. Choosing sensibly means describing your own riding honestly rather than reaching for whichever number sounds most impressive.
What the fine end is and is not for
Grit that gets through an air filter ends up between moving parts, and unlike a loaded filter it cannot be undone at the next service. That is the whole case for this element on a Hunter 350, also badged Hntr 350, that spends its life where the air is dirty. It is not a power case: a drop-in element does not make a standard 350 single noticeably stronger, and the reduced flow makes this medium the wrong purchase on consistently clean roads.
Care and cleaning
An air line on the clean face, worked outwards, is the routine. Water is for the occasions air cannot manage: lukewarm, a little mild detergent, then rinsed until it runs clear. Drying is done in the open, however long that takes, and never with heat or flame, both of which destroy the fabric. Refit it dry and unoiled. The maintenance sheet for the CM231P14 is in the Downloads tab.
Fitment & Compatibility
Built for the airbox of the Royal Enfield Hunter 350, written Hntr 350 in some markets, from 2022 to 2026. Alongside it Sprint Filter lists the Bullet 350, the Classic 350, the Goan Classic 350 and the Meteor 350 on the same element. Confirm your year under Fitment.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- Royal Enfield Bullet (2023–2026)
- Royal Enfield Classic (2022–2026)
- Royal Enfield Goan Classic (2025–2026)
- Royal Enfield Hunter / Hntr (2022–2026)
- Royal Enfield Meteor (2021–2026)
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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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