I was somewhat frustrated that I could not easily buy air filter foam inserts for the common 25cc Chinese chainsaw. Sellers sold the housing, but no filter element in it.
So, the project is to make a template to cut a foam element that is a neat fit inside the housing.
Above is a sketch laid up over a picture of the filter cover. The template is made a little larger than the aperture so that the foam filter element compresses a little to fit. Continue reading A template for an air filter foam element