Need help identifying cause of black oily spark plugs.
Cookingkahle Cadet Joined Apr 18, 2019 Messages 14 May 5, 2019 #1 Need help identifying cause of black oily spark plugs.
merc850 Commander Joined Jul 7, 2010 Messages 2,055 May 8, 2019 #2 Wrong heat range, too much/wrong oil, low speed needles too rich and long idle periods.
