Speedblue may be on to something, about sparking from the high voltage spark plug wires to the ignitor. I have the Nology wires and have never had the problem, but as I remember, the Nology wires have an outer sleeve that is grounded to the frame by a nearby bolt into the frame. If I remember that correctly, then that spark plug wire shielding would preclude any sparking over to the ignitor. My question becomes: "HAS ANYBODY HAD AN IGNITOR FAILURE WHILE USING THE NOLOGY SPARK PLUG WIRES (which are shielded)??"
A secondary question might be: "HAS ANYBODY HAD AN IGNITOR FAILURE WHILE USING ANY PREMIUM SPARK PLUG WIRES??".