The facts.
DescriptionThe whole story▼
An air filter is normally drawn around a constraint nobody negotiates: the housing is a fixed volume with a fixed mouth, and the element has to live inside both. Every ordinary Sprint Filter panel for an F3 800 accepts that and works within it. R135S-SBK refuses it. This is a bigger element than the standard aperture allows, carried on a carbon fibre frame, and the airbox has to be modified and the filter repositioned before it will go in at all.
Key Features
- Oversized WorldSBK-specification element carried on a carbon fibre frame
- Installation requires modification of the series housing and relocation of the element
- Dry P08 cloth, 80 µm and 5,050 l/m²/sec, with no oil at any point in its working life
- The frame holds the medium at constant tension through repeated removal and refitting
- Washable and reusable — compressed air is the routine service
- Two-year guarantee from the date of purchase
Why a larger element needs a frame of its own
Flow is quoted per square metre per second, so the amount of cloth in the box is one of the two levers an element has; the gap between the threads is the other. A panel confined to a fixed outline can only pull the second lever. This kit pulls the first, and that is precisely why it no longer fits where the original sat. Once an element is no longer carried by the standard mounting, whatever holds it becomes a real component instead of a moulded surround. Carbon fibre does not swell when the medium is washed and does not corrode afterwards, and it keeps the sealing shape the assembly had when new — useful on a part meant to come out and go back in many times.
Worth saying plainly before anyone orders
This is not a power part. An element sitting inside an airbox does not make a standard F3 800 noticeably stronger, and nothing about a larger one changes that verdict. It runs to roughly four times the standard road element for this machine, and what that pays for is construction, cloth area and the labour of installing it. The 800 is listed from 2012 all the way through 2026, so the bike may be nearly new or well over a decade old. Reworking a housing is far easier to justify on a machine that sees circuits than on one that does a commute.
Care and cleaning
Regeneration is mechanical rather than chemical. A compressor line held against the clean side of R135S-SBK and blown outward returns the weave to something close to its original state, and usually that is the whole procedure. A dirty spell that survives air comes out with tepid water and a little mild detergent, rinsed through until the run-off is clear. After that it needs time and moving air and nothing else: heat guns, radiators and open flame are all off the list, because heat is what polyester will not survive. It is refitted dry and untreated. Cleaning instructions are filed under Downloads.
Fitment & Compatibility
Listed for the airbox of the MV Agusta F3 800 from 2012 to 2026, after that airbox has been modified to receive it. The other machine on the same number is the F3 675 of 2012 to 2021 — two entries, one kit.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- MV Agusta F3 675 (2012–2021)
- MV Agusta F3 800 (2012–2026)
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