The CRM250 air filter element, an oval dual layer foam. The green oiled coarse outer layer, the oil film trapping the big grit and debris; the white fine inner layer, taking the fine dust, the engine breathing clean air. Twin intake slots in the middle, sitting on the two carburetor intakes, both intakes getting air at once, neither starved and neither fighting; a center black rubber ring lining the intake passage, hugging the edge to seal the air, the air taking only the two paths of the slots and the ring, with no seam leak. The oval shape seats the air cleaner box, the edges closing all the way around. Wash with cleaner or clean water, squeeze gently, dry, thin with a coat of air filter oil, and it reuses; swap it when it hardens, crumbles, will not wash clean or tears. On fit, line up the two slots, the center ring and the oval curve on the new element against the old one. Machines of the same type mostly fit, but fit is not guaranteed for every one; slots on the intakes, ring on the passage, the box lid on tight, then start.

 FAQ 

Q1: What is this part?

A CRM250 foam air filter element, oval and dual layer, the green oiled coarse top and the white fine base, with twin intake slots for the two carburetor intakes and a center rubber grommet for the intake passage.

Q2: Why does it have two slots in the middle?

The machine has two carburetor intakes, one throttle bore each, and both need air at once. The two slots sit on the two intakes, so each one breathes without leaking and without starving the other. A round element cannot cover two intakes.

Q3: How do I check fit before ordering?

Compare the position of the two slots, the center ring and the oval curve on the new element with your old part. It is not guaranteed for every motorcycle, so checking against the old element is the safe way.