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.
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The Home Machinist
If you need to send a part out to be built by a professional shop, a good drawing, well identified, is essential. The KISS principle applies, and be sure you don't request closer tolerances or more exotic materials than you really need, or it will cost you.
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