Did you know that many new motorcycles, scooters and ATV’s come from the factory with insufficient air filter oil? We’ve come across the problem on numerous occasions on brand new equipment. In the Cyclepedia video shown below you will see how the thin factory filter oil will settle at the bottom of the air filter, leaving the top unprotected. Left in this condition, dirt particles then can enter the engine and quickly cause severe engine damage and oil contamination. Watch this Cyclepedia tech video and we’ll show you an example of an improperly oiled air filter on our Yamaha WR250F. Be sure to check out our full library of both print and online motorcycle repair manuals.