Uncategorized Spark plug fouling question (pics) November 15, 2016 dstech Hi guys, I have a few pics of a fouled spark plug on my 660 here and could anybody help me identify what is going on? It looks like it’s carbon fouled but I have no experience with spark plugs. Attached Thumbnails Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related