The air filter on the 1B engine must be serviced and the filter cartridge replaced every 500 operating hours. The air filter protects your drive and its combustion chamber from contaminants. These can damage the engine components, which negatively impacts the power of the engine and can even make additional repairs necessary. Therefore, it is extremely important to diligently maintain the filter. Otherwise it could get very expensive. Our expert Fred will show you how to replace the filter in this instructional video.