The KTM125 air filter element, green pleated paper media, treated with oil before delivery, the dust sitting on the face instead of working into the fibers, the element not baking out of shape when the engine runs hot. A black plastic frame clamps the pleats, air entering at the frame opening, running the pleat gaps, and leaving through the center, with no bypass; clips and locating tabs on the sides snap into the air cleaner box's slots, the element not moving or shifting, the box lid pressing down to lock it. The pleats multiply the media area, catching finer dust than foam and more than a flat sheet, without choking the air. Paper is not washed; water soaks the fibers and strips the oil film, and the filtration is gone, so a dirty element is swapped for a new one, take it out, fit it in, and ride. Look through the pleat gaps at the light, and when the dust shows through, the color goes gray and dark, or the pleats squash and the air stops moving, that is the time. On fit, line up the frame corners, the clips and the pleat direction on the new element against the old one. Machines in the same family mostly fit, but fit is not guaranteed for every one, so comparing against the old part is the safe way.

 FAQ 

Q1: What is this part?

A KTM 125 paper air filter element, green pleated oil-treated media clamped in a black plastic frame with side clips, for the air cleaner box of street motorcycles.

Q2: Can the paper element be washed?

No. Paper filtration depends on tight fibers and the oil film, and washing soaks the fibers and strips the film, so the filtration is gone. A paper element is replaced, not washed; foam elements are the washable kind.

Q3: Which motorcycles does it fit?

The KTM 125, Duke 125, 200 and 390 family, and the RC390 line. Fit is not guaranteed for every one, so compare the frame corners, the clips and the pleat direction on the new element with your old part before ordering.