Small Engines (Lawn Mowers, etc.): LAWN TRACTOR BAKCFIRING, blown head gasket, plug gap

Question
I HAVE A CRAFTSMAN LT100 AND IT HAS A BRIGGS AND STRATON ENGINE. WHEN I CRANK IT IT ONLY RUNS FOR ABOUT 15 SECONDS THEN IT STARTS TO BACKFIRE SEVERAL TIMES AND THEN SHUTS OFF.

Answer
 Hello Kyle:

 There are Several Things that can Cause this. 1- The Carb Requires Overhauling. 2- A Burnt Valve. 3- A Blown Head Gasket. 4- Improper Plug Gap. 5- A Clogged Fuel Filter. I would Suggest Checking the Carb First. Hope this Helps. Let me know what Happens, Please.

 Good Luck

 Respectfully

 John