The facts.
DescriptionThe whole story▼
There is a list every rider runs through before taking a machine out after it has stood a while: tyres, brakes, lights, chain, fluids, battery. The air filter is almost never on it. Not because it does not matter, but because checking it has always meant committing to buying one — you open the box, you see something grey, and now you either fit it back or order a part. On a Monkey 125, which spends more of its life parked than most motorcycles, that is exactly the wrong incentive.
Key Features
- Single-layer woven polyester, run dry: 80 µm at 5,050 l/m²/sec
- No oil at any point in its life, so nothing to dose and nothing to migrate
- Sits in the series airbox in place of the paper panel, nothing modified
- About twice the working surface of a typical performance element
- 93.13 % of 100-micron particles held back, against 76.42 % for four-layer oiled cotton
- Cleaned and put back for the life of the machine; two years' warranty from purchase
Putting the filter on the list
A washable element changes the economics of looking. Opening the box costs ten minutes and nothing else: if the element is clean, it goes straight back; if it is not, an air line puts it right and it still goes back. Nobody has to decide whether the state of it justifies a purchase. That sounds like a small thing, and it is — right up to the point where a machine that has stood through a damp winter gets ridden again, and the one item nobody inspected turns out to be the one that changed.
What it will not do
It will not make a standard Monkey 125 quicker. A drop-in filter never does that on a standard road machine, and on a 125 the ceiling is set by the licence class long before anything in the intake tract gets a say. The PM179S offers something duller and more real: an intake restriction that starts lower and, because you can restore it whenever you like, stays lower. A paper panel is at its best on the day it goes in and at its worst on the day it comes out, and nothing in between announces itself.
Care and cleaning
Compressed air on the clean face, worked outwards, so what the weave stopped leaves the way it arrived. If something will not come out dry, lukewarm water with a little mild detergent will lift it — rinse until the water runs clear. Then let it dry in moving air at its own pace. Never heat, never a flame, never refit it damp, and never treat it with anything. The maintenance sheet for the PM179S is in the Downloads tab.
Fitment & Compatibility
The P08 element for the first-generation Honda Monkey 125: model years 2018 to 2021, frame code JB02, the version with the four-speed gearbox and the airbox cover Honda numbers 17235-K0F-T00. Sprint Filter built the PM179S with an enlarged filtering pack, and that extra depth is exactly why it stops there. From 2022 Honda fitted a new engine, a five-speed box and a redesigned cover (17235-K0F-T60), and with the PM179S inside, that cover no longer closes. For a 2022-or-later Monkey (JB03 or JB05) the matching part is SM302, made to the dimensions of the Honda element.
Do not use the original Honda filter number to decide: 17210-K0F-T00 is the same on both generations. Count the gears, read the frame code, or check the part number on the airbox cover.
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
- Honda Monkey 125 (2018–2021)
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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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