Keeps killing spark plugs

[Born2Mow]

NGK plugs seem to resist fouling better than other brands.

 

[Gumby83]

I have a Yardworks 19 hp riding lawnmower with a intek Briggs & Stratton engine and it will run perfect fir about 15 - 25 minutes then it dies , and I check for spark and it has none so I change plug and it has spark and runs again for another 15-25 minutes then it dies again with no spark, and again I put new plug in and it runs again and then repeats , what do you guys figure is the problem could it be the coil ??? Thanks for any help you can give

If you’re not the original owner, Have you verified the correct spark plug is being used? Meaning not just replacing it with what was already in there, but looking up the correct plug in the manual (or on the B&S website)? It might be that the plug in it is the wrong heat range which could also be killing the plugs.