Small Engines (Lawn Mowers, etc.): LT133 Stalls and Backfires When Hot, john deere lt133, coil ignition

Question
My John Deere LT133 is approximately five years old.  Last month, it started stalling and backfiring after 30 minutes of use.  The dealer cleaned the carburetor and said to use 93-octane gas.  

This did not fix the problem.  Yesterday, I notice that the problem occurs when you slow down or stop to empty the rear bags.  When I turn it off the empty the bags, it would backfire and stall when it was restarted.  If I wait a few minutes, it would restart without a problem.  

I decided to lift the hood to allow the engine to cool when I emptied the bags.  The mower would start without a problem.  What could be causing the problem?


Answer
 Hello Daniel:

 When a Coil/Ignition Module Starts to go bad you will have the Symptons you Described. When the Coil/Ignition Module Heats up it will Cause the Engine to Backfire One or More times and Quit. After it Cools the Engine will Restart and Run Until the Coil/Ignition Module Heats up Again and the Process Starts Over Again. Use the Mower Again. When it Quits, Check for Fire at the Spark Plug Right then. **BE CAREFUL HOT ENGINE** If you have Fire at the Plug, then Check the Valve Lash (the clearance between the valve stem and the valve tappet). If the Clearance is to Close the Valve will Not Seat Proper when the Engine Gets Hot and you have the Same Symptons. If No Fire at the Plug, then the Coil/Ignition Module is Bad. You can go back to Using Regular Gas too. The Octane isnt the Problem. Hope this Helps. Let me know what Happens, Please.

 Good Luck

 Respectfully

 John