The KL125 air filter element is the round bowl sponge element. The foam body is yellow, the rings at the top and the bottom are black, and the bowl follows the wall of the round box, with the black rings seated in the groove to seal it, so air has to go through the sponge wall, there is no way past. The yellow sponge catches the fine dust, the path is short and the resistance is low, which keeps up with the demand for air when the engine is revved hard. It can be washed, rinsed, oiled and refitted once it has set. Holes in the sponge wall, rings that no longer seat, or an element that has gone soft and will not spring back all mean the time to replace. The KX250, KLX250 and KX500 family runs the same shape, but fitment is not guaranteed, measure the diameter of the old element, the width of the rings and the depth of the bowl, and match them before ordering.

 FAQ 

Q1: What is this part?

A round bowl foam air filter element for a dirt bike, a yellow sponge body with black rings at the top and bottom. The yellow does the filtering and the black does the sealing, and the bowl shape follows the wall of the round airbox.

Q2: Which machines does it fit?

It is the element for the KL125, and the same family of dirt bikes, KX250, KLX250 and KX500, run the same shape. Fitment is not guaranteed, so measure the diameter, ring width and bowl depth of your old element and match them before ordering.

Q3: Can it be washed? When do I replace it?

Yes, a sponge element can be washed, rinsed, oiled and refitted. Replace it when the sponge wall has torn, the rings have gone out of shape and no longer seal, the element has gone soft, or a few washes no longer bring it back.