It depends which kind of air cleaner it has Figarow. Briggs has two main types on the side valve engines: the single stage type, and the two stage type. The single stage type uses a block of urethane foam as the filter element. This type is serviced by washing the foam in petrol to remove both the dirt and the dirty oil it had previously been soaked in. It must then be re-oiled by squirting some engine oil on it and wringing as much of the oil out of it, as is possible without tearing the foam. The two stage type has a foam pre-filter around a paper filter. They are serviced by cleaning and oiling the pre-filter exactly like a solid foam filter. The paper filter is serviced by blowing air through it outward from the center, so that dirt goes back the way it came in, rather than blowing it deeper into the filter.
In theory there is no wet-cleaning process suitable for use on paper filters. In practice some of us have been known to experiment, more or less successfully, but Briggs does not approve.
