Here is a photo of a 1930 Model FI Briggs & Stratton, serial no. 13489. The owner, Cliff Christen, brought it to the "Kimmeys of the Kodgy Moshes," a group of men who restore old gas engines. The name of the group translated, means Friends of the Old Machines.
When Cliff brought the little engine in, it was pretty rough-looking and needed some attention. It was complete except for the tappet end of the exhaust rocker arm, which had been broken off. It was taken to the gentleman down the valley, who is a good gas welder and he brazed an end onto the rocker arm. After checking and cleaning the points, the little guy started on about the fifth crank. Now with further tinkering and adjustment of valves and points, it regularly starts on the second crank.
Some of the points of interest to me are the fact that it has overhead valves with external pushrods and rocker arms with a cast steel head and block. Another interesting item is the starting mechanism, which is a short piece of roller chain and sprocket device.
P.O. Box 522
Boonville, CA 95415