I don't know whether this particular mower has the Briggs & Stratton 13 cubic inch engine or the Honda. If it's a B&S with the oil slinger system and it had the proper amount of the proper oil, I don't really see how you could tilt the engine enough to impair lubrication without the fuel running out of the tank, but I'm saying that without seeing the mower. On the other hand, over-revving with the B&S governor shouldn't happen unless something has gone wrong with the governor, and that should be pretty obvious if it happens. Personally I'd want to know why it broke before I repaired the engine, in case it happened again (like 30 seconds after you started it up.)
