Small Engines (Lawn Mowers, etc.): Could start my lawnmover, lawnmover, excess oil

Question
My lawnmower, "REAR BAGGER" Model # 20700, does not start. I have replaced the starter and cleaned the filter, and it still wouldn't start. The last time I started it was three months ago. At that time I over fueled it with motor oil and when it started, lots of black smoke came out.

Thank you in advance any advice you can provide to us.

Jack  

Answer
You may need to remove the spark plug and crank the engine over to clear out excess oil.  Install a new plug and try it again.  It's also possible that old gas can be causing it to not start.  Drain and replenish the tank with new fuel.  Hope this helps.