Before this happened to me I would have thought a mechanical issue or driver error. I always turn the pump off before shutting the engine off. Prime the carbs and then turn the pump off until it's running. I think I kicked the throttle 4 times total. The only thing that I see at all is the #7 plug is carbon fouled. Looks like it hasn't been firing, at least on this start up. I will build some type of blow off now.
Doug