I have been telling people until I am blue in the face that they need to keep the grass and leaves out of they Walkers but do they lesion. Well I wondered when it was going to happen and it did. A Kohler in a Walker got so much dry-ed grass and leaves packed in around it and in the blower housing it caught fire. Before it could be turned off the blower housing, fuel pump, and valve cover and the charging system got melted. A few more seconds and the fuel system would have been breached and 5 gallons of gas would have went off. I wished I had pictures. What part of "Air cooled engine" do people not understand?