Why go anywhere else with all of the brains right here. Craftsman 22" mower, 6 HP Briggs engine. Starts fine with one pull when cold. I mowed for 15 minutes. Shut it down. Tried to restart and no luck. Even squirted a few drops of 89 octane gas in the spark plug hole, and not one fire. Let it sit for a couple of hours. Same story. Starts right up and runs fine until I shut it off. I replaced the spark plug, set at .030" and also .020" gap; still no start. Gas cap tight and also loose, so that is not the problem.