It is common practice in many amateur-built engine installations, from Rotaxes to Lycomings, to use K&N filters. They do a wonderful job of filtering the air, and they are reusable. However, they only are able to perform correctly if they are properly cared for. They should be cleaned annually at a minimum with K&N filter cleaner and then lightly oiled with K&N filter oil. Without the oil, which leaves a slight pink color on the filter, they will not filter properly. The one in the photo above was not oiled.
In Case You Missed It
Light Stuff
Freedom from airports: takeoffs off and landings where there aren’t normal runways. By Roy Beisswenger.
Engine Beat
Steve Ells - 0
Steve Ells examines the RSA-type fuel-injection system, shows you how to set the idle speed and idle mixture, and how to clean the nozzles and screens.
Balancing Act
Troubleshooting vibration problems in homebuilt airplanes. By Matthew Dock.
Flight Review: Jabiru J230 Light Sport
Marc Cook flies the nimble, LSA-compliant Jabiru J230, and finds the two-seater offers a smooth ride with a decidedly Outback attitude.