Posted by RN on October 20, 2008 at 09:39:26 from (96.60.81.245):
In Reply to: Fouled plugs posted by Joe Mara on October 20, 2008 at 09:24:11:
Black fouled plugs? If you're using light winter oil like a 5-20 you could get some extra oil by rings and valve stems- try 15-40 or straight 30 low ash. Other well known reason is running rich- adjust carb leaner. Rich mix usually has some black smoke from exhaust, oil burning from worn rings ,etc has gray or whitish smoke from exhaust. Plug problems at times - running a cold range plug for light duty can result in fouling, switch to light duty 'hotter' range plug. Coil problem symptoms should show up even after changing plugs when hot. Distributer check- condensor going bad would cause a bit of miss and pitted worn points that would have a few missfires- fouling would be about same as rich run for next firing cycle. Points gap less than .010 would maybe cause misfiring also, had start and missfire on IHC 303 combine from wear and close gap that mostly went away after clean and proper gap- point gap should be .018/.020 inch. This should give a little idea of what to check. RN
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