[AT] Kinda Antique Tractor Question

[craig.warner47346 at frontier.com]

I’ve got a question that’s kinda antique tractor related (depending on how you define antique.) I have a 1992 Ingersoll 6018 with an Onan 16hp motor. It usually starts and runs great. Last few weeks it’s been terrible to start but then runs fine. I pulled the plugs today and the gap was close to nothing in both of them. Opened the gap to.030 and it fired right up. Why would the plug gap close? I had issues with them this spring and set it at that point.
Thanks,
Craig
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