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I agree, old cast-iron Kohlers and Briggs that look like that are 4-strokes. Hope you haven't run too much gas/oil mixture through it until you get the numbers off the engine and figure out exactly what it is. I actually ran a Briggs on a tankful of diesel once...

Do this at your own risk...If it isn't starting well, remove the filter, pour A LITTLE gas (meaning not even a full ounce) down the air intake, pull the starter, and see what happens...again, do so at your own risk though, and make sure no other people or combustibles are nearby. That should help tell you if you've got dirty passages in the carb.