Small Engines (Lawn Mowers, etc.): stx38 no run, tall grass, safety switch

Question
I have a JD STX 38 - Kohler CV12.5S, Serial Number 1913707788.  I was mowing and it sputtered and stopped.  Restarted, and ran for 5 - 10 minutes, then it quit again.  Sent it off to the shop, $200 later they said it was a loose wire to battery (I did have them install new blades too).  They delivered it to the house, and it ran for 5 - 10 minutes and quit again.  Now it won't start.  I suspect electronic ignition.  Is there a way to test it?  I don't want another $200 bill AND tall grass.  Any Ideas?

Answer
Hello Coleman:

Remove the Spark Plug. Wrap a Wire Around the Threads and Attach the Other End of the Wire to the Engine Block Turn the Engine and See if the Plug Fires. If No, then Disconnect the Control Bracket Shut Off Wire First, Check for Fire at the Plug. If Still No Fire at the Plug; Then Disconnect the Shut Off Wire at the Coil and Check for Fire at the Plug. If No Fire at the Plug , then the Coil/Ign Module is Bad. The Coil/Ign Module to Flywheel Gap is .020in. If the Plug Fires at Anytime During these 2 Checks, then a Safety Switch or Wire May be the Problem. Yes the Engine will Turn Even with a Bad Safety Switch. The Blade Safety is Usually the Cause of this. The Starter Turns and The Engine Doesn,t Fire is and Indication of a Bad Coil/Ing Module or a Faulty Blade Safety Switch. The Clutch Safety Prevents the Starter from Engaging so the Mower Does Not Move when the Starter Turns the Engine. The Seat Safety is Designed to Stop the Engine if the Blades are Engaged or the Clutch Safety is Not Engaged when you Leave the Seat. The Gas Tank Cap May Not be Venting the Tank Properly and Causing a Vacuum in the Tank and the Vacuum Restricts the Gas Flow to the Carburetor. Hope this Helps. I am Here if You Require More Assistance. Let me Know What Happens, Please. Thanks.

Good Luck

Respectfully

John

PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting you Question at or Just After 9pm EST (US). My New Day Starts then. Thanks.

Respectfully

John