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wmws · 10-19-2019, 08:36 AM

Most likely you carburetor running too rich. Won't hurt to check the timing also. But make sure your GAV is closed and the choke plate is all the way open. Also be sure the plug heat range is right. Properly tuned a Model A should not foul plugs. I have never cleaned a spark plug in my A.

10-19-2019, 08:36 AM	#4
wmws BANNED Join Date: Feb 2013 Location: Coatesville, Pa Posts: 719	Re: Black spark plugs Most likely you carburetor running too rich. Won't hurt to check the timing also. But make sure your GAV is closed and the choke plate is all the way open. Also be sure the plug heat range is right. Properly tuned a Model A should not foul plugs. I have never cleaned a spark plug in my A.