The facts.
DescriptionThe whole story▼
Dust is not spread evenly through a riding year. It arrives in a handful of weeks — a dry fortnight, a stretch of roadworks, a southern tour in August — and those weeks are usually the ones spent furthest from the garage where the airbox is easy to open. That mismatch is what this element is for. The catalogue credits it with a hundred per cent more filtering surface than the standard-size version of the same fourteen-micron mat: the same protection, carried further before it needs a bench.
Key Features
- Dry special non-woven polyester, closing to 14 microns
- Twice the filtering surface of the standard-size element for the same airbox
- A rated 1,800 l/m²/sec of material — the medium's own figure, unaltered
- Free of oil throughout, so nothing travels forward to the throttle bodies or sensors
- Exchanged directly for the paper panel, with the housing and the map left alone
- Cleaned with compressed air rather than replaced, two years of warranty from purchase
The service you cannot do where you are
An air filter is the one maintenance item that can be dealt with anywhere in principle and almost nowhere in practice. It wants a compressor, or failing that a sink and a day of drying, and a sports tourer three countries from home has neither. Riding on with a loaded element is not dangerous and nothing will indicate it, but it is a slow surrender of the thing you fitted the filter for. Enough capacity to cover the whole trip and be serviced at the end of it is a straightforward answer to a straightforward problem.
Two clocks, only one of them slowed
The doubled area postpones the loading clock and leaves the other one running. Fine material still passes at whatever a fourteen-micron mat passes; that figure is a property of the medium and no amount of surface adjusts it. So the element is not more protective, only longer-lasting between services, and the two ought not to be confused when comparing versions. Nor is either of them a performance part: a panel inside a standard airbox does not make a standard R 1250 RS noticeably faster, and the doubled surface does not change that sentence in any way.
Care and cleaning
Back at the bench the routine is short, and the direction matters more than the effort. Air is applied to the clean face and driven outwards; from the dirty side the load would only be pressed deeper into the fibres, which on a bonded mat is difficult to undo. Water is the second stage and only when needed — hand-warm, with a small amount of mild detergent, rinsed until nothing further leaves the material. Drying happens in open moving air, without a heater, an oven or a flame anywhere near it, and the K142P14 goes back dry. Its servicing sheet is under Downloads.
Fitment & Compatibility
Made for the BMW R 1250 RS of 2019 to 2023, seated in the unmodified series airbox. Six road boxers share the part number — the R, RS and RT of this generation and the three that preceded them — with the years for each given in the Fitment tab.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- BMW R 1200 R (2014–2018)
- BMW R 1200 RS (2015–2018)
- BMW R 1200 RT (2014–2018)
- BMW R 1250 R (2019–2023)
- BMW R 1250 RS (2019–2023)
- BMW R 1250 RT (2019–2023)
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