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Good Evening Ken, Well, I cant say whether its time for new rings or not, lets not give up or assume such a drastic measure just yet from your brief description however. If new plugs are fouling that quickly, it could just be a carburetion or an ignition problem, as it takes a while for excess oil to foul the plugs and it has to be in fairly bad shape (rings, valves, cylinders etc) to foul them that darn fast. That black on the plugs sounds like youre runnign too rich (see below) though or the spark may be weak (see below). Heres a few thigns I would look at first (carb and ignition checks), and if they are all good then look at the compression and we will go from there. 1) That black color you mention on the plugs could mean youre runnign way over rich which can gas foul them fairly quick. Is it a flat black colored even sooty deposit????? ? That can be excess unburned fuel. Is it more of a shiny wet black uneven coat, that may be oil. If she dont blow a lot of blue smoke out the stack and have a lot of crankcase blow by, however, Im thinking more excess unburned fuel for the time being. (I) FUEL RELATED CAUSES OF EXCESS UNBURNED FUEL FOULING PLUGS a) Is the choke butterfly plate in the carb opening all the way and remaining open once youre up n running????? b) Is the air inlet pipe and air cleaner and its bowl clean and water free???? c) Is the carb set too rich and does she black smoke a lot at idle or under load which indicates excess unburned fuel??? Have you tried to run the carb a tad leaner and see what she does and how the plugs look??? EXCESS BLACK SMOKE OUT THE STACK FROM UNBURNED FUEL (caused by a or b or c above) quicky fouls plugs leavign that even flat black sooty deposit!!!!! !!!
(II) IGNITION RELATED CAUSES OF INADEQUATE FUEL COMBUSTION
d) If you remove the plugs and have their wires atatched and them against frame ground and crank the engine, do both fresh new plugs produce a good visible blue and NOT a faint thin wimpy yellow spark??? If the spark is weak you dont get as good combustion. e) If the spark is weak, look at the points and first insure they are gapped correct and NOT burned or pitted or carboned up or heavy gray oxide coated. If so, replace them and try a heat range hotter plug. Some run an extra plug washer to make them run hotter which can help burn off deposits. f) Is the cap clean and free of cracks or carbon tracks??? g) Are the wires good, no leaks, and wire core NOT carbon core auto suppressor types??? h) If you remove the coil wire from the cap and have it to within 1/8 from frame and crank her over, does it yield a good visible blue and NOT a faint thin wimpy yellow spark??? If she sparks good there but NOT at the plugs per the test above, you may have a plug or plug wire or cap or rotor problem. SUMMARY The plugs and exhaust are a good indicator of whats happening. A lot of black smoke may mean restricted air from a partly closed choke or a clogged air pipe or filter or carb set too rich or even float level a bit high. Again, the flat black even sooty deposit is more a sign of a fuel or weak spark problem than an oil burner. Heavy blue exhaust and a lot of crankcase blow by is more a sign of a ring or valve or cylinder problem and that plus low compression readings leaving a wet uneven shiny plug coat will foul them but not usually in only a few minutes. Look at the spark quality and plugs and points and cap n rotor and wires and check the air system and filter and choke. Try the cheap simple easy thigns first like air inlet and choke checks and points and wires BUT THE EXHAUST AND PLUG DEPOSITS IS A GOOD INDICATOR OF THE PROBLEM. Check the compression dry after shes sat a good while and then with oil in the cylinders for a wet test and if very low or uneven between sides that can eventually cause oil fouling. First thing suspect if the plugs are good and the chokes opening and no air restriction and the carbs not set over rich ARE SHE NEEDS NEW POINTS OR GAPPED, check that right off. Post back or e mail [email protected] with any more questions. Good Luck n God Bless John T Nordhoff
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