What aftermarket air filters are best?
Several air filters are available. Foam filters include the Moose, Uni and Twin Air. (I’ve seen one Twin Air filter that was too small for the filter basket, and didn’t have a hole for the screw. Don’t know if this was an isolated case or the wrong part number.) In addition, K&N makes a gauze filter for the KLR. Some people feel that the K&N lets dirt through; however, inspection of bikes running K&N filters show no dust on the inlet screen. The downside of K&N filters is that, in very dusty conditions, they can clog up solidly enough to stop the engine. To avoid this, a prefilter/filter skin can be used. These are stretchy covers that are oiled and placed over the filter. When it’s dirty, pull it off and put a new one on, or just run with the filter alone. The skins are reuseable with washing, and can also be used with foam filters. See the [links] section for a comparative filter flow test.
