87-04 KAWASAKI KX500: No Toil Pre-Oiled Dual Stage Air Filter Performance from the bottle to the throttle! NoToil are the inventors and manufacturers of the world&#39;s first biodegradable and non-toxic foam filter maintenance system for the motorsports industry. Providing you with more time to go fast. The best filter at the best price. No-Toil Fast Filters offer a great performing air filter for dirt bikes that is inexpensive yet dependable. A high quality, 2-stage foam air filter that is pre-treated with No-Toil Evolution biodegradable filter oil.