I fixed the mower I bought for $40! What caused the crankcase to fill with gas was the vacuum powered fuel pump sucked in gas as well as a vacuum and a cracked o-ring on the carb main jet seal was filling the intake full of gas as you try to start the engine. Also the starter solenoid was bad.
Painted the engine cover blue :D
This thing is fast and fun to drive! I cut my yard in half the time compared to my 42" tractor, even though this is a 30".
No longer smokes, starts in less than 2 seconds and ready to go. I do need to check the transmission oil.