Ok, so I am not an engine guy, but I am learning slowly.
Mower: Murray Select 12.5HP/40"
Model: 405002X8a
Engine: Briggs and Stratton
Model: 28v707
Type: 1113-E1
Well it's kind of old, about 12-13 years maybe? Been running fine for the first month and a half or so of having it out and mowing...