Hi there - I had the misfortune to hit a small unseen stump in the weeds in my Victa (from down under) 19" mower. It's got a B&S 725EX 163cc 104M02-0216-H5 engine DOM 08 22 2018 proudly made in the USA. After the hit, the engine went into overspeed and the throttle control could only shut it...