How does leaded fuel affect spark plug fouling (in older vehicles)?

May 30, 2014 ... ... plug solid with dirt causing a rich running condition fouling the plug. ... 2005 EZ GO ST fouled spark plugs, Gas EZGO. carbon fouled plug, Gas ... Apr 29, 2012 ... Thanks Jim. I'll check the air control cable. That sounds like a likely cause. There seemed to be good tension at the lever but of course that ... Jul 28, 2014 ... ... fouled plugs are more likely to be caused by a fuel problem than an ignition problem." What do you mean by this? If the bike if performing ... Oct 24, 2015 ... Pulling the plugs, all four plugs are identically and evenly coated with a dry dusty heavy black carbon that cleans easily with a wire brush. I ... Nov 28, 2022 ... I just changed my own spark plugs, and it seems they are Carbon fouled. ... I don't think the condition on these plugs would cause any harm to the ... Jan 31, 2020 ... Gentlemen, I have a sooty, carbon-fouled spark plug problem that I ... carbon building up on the exhaust valves causing them to leak. Jun 25, 2013 ... Carbon fouling occurs when the spark plug firing end does not reach the self-cleaning temperature of approximately 450°C (842°F). Carbon ... Aug 18, 2001 ... Rich mixture and or rich main jets can cause the carbon/plug problem but if its really bad enough to cause a problem you should see black smoke. The causes for such a buildup include a heavy carburetor float, a leaky injector or carburetor needle valve, malfunctioning of the spark plug wires, or ... Jul 10, 2003 ... Dry black carbon deposits could be an indication of a rich mixture ... More than a quart in 1000 miles is cause for concern in my book.