Small Engines (Lawn Mowers, etc.): another problem, model numbers, engine oil

Question
hey i changed the oil and then i was tring to start it and i herd a boom and now it wont even turn over can you help me again

                      john

Answer
 Hello John:

 No Worries. I have had My Share of Mowers Just Like Yours. Explain Boom? Where Did It Come From? Muffler, Piston (Spark Plug Side) Did Engine Oil Come Out of the Fill Tube? Check the Bottom of the Fill Tube. The If what I Supect is True the Smoking was Due to a Cracked Ring.  Send me the Model Numbers Off of the Engine, Please. I want to see the Diagram of the Engine. Hope this Helps. Let me know what Happens, Please. Again No Worries. I Love a Challenge.

 Good Luck

 Respectfully

 John