I removed the air filter from the engine and picked up a K&N cleaning kit:
Cleaned, oiled, and ready to put into service:
Air filter back on the engine and ready to go:
Engine air filter
Matt's RV-7 Project
"If you're going to repair a motorcycle, an adequate supply of gumption is the first and most important tool. If you haven't got that you might as well gather up all the other tools and put them away, because they won't do you any good."