Lean mixture on the pilot circuit.
It's possible that you have some worn things in your engine, which might cause it.If you had leaky valve seats, that can cause spitting back thru the intake. And leaky valve guides can cause oily spark plug.And an exhaust leak at the head joint might cause a lean mixture condition and spitting, so check your header pipe fit into the head for any leaks or visible carbon showing around the header pipe joint to the head.
thanks--will check as best I can. The cylinder head rebuild by the shadetree jackass I paid to do the initial work sure isn't precluding any of that.How would you check for a leaky valve seat or guides?I've been regularly looking for soot at the exhaust header join, though, and not found any.
1800 feet AMSL, and right now it's 70s-80s (F) daytime, will drop to 60-70 in the winter and up to 115 daytime in the summer...
Also check that the little rubber grommet at the base of the enrichener shaft is attached to the brass (or whatever) base. If not, it prevents the enrichener from closeing completely and you'll run extremely rich. I was fouling plugs last year (oily or gasoline-y) before someone finally suggested the grommet and it turned out to be the culprit. I re-attached mine with silicone sealer and it hasn't given me a problem since.Jeff
Next time I have it off I'll take a better look inside.
You didn't frinkle with the cam timing did you?If the intake is opening too soon that could cause some spitting from the carb.
I've had my uce ping briefly a couple times in very specific circumstances and it sounded just like the ping of a small japanese four banger.
Pushrods were perfect.Engine was assembled here in India by one of those "mechanics," but when I spoke to him about the engine we even discussed how the timing marks were supposed to be oriented. Haven't opened the timing cover myself to check it out, but since there's no other performance-based additions to the engine I would doubt that's the problem.I retarded the timing a hair. I am still, it seems, unable to clearly differentiate ping from the normal valve noise. Someone else described it as something like the sound of a ball-point pen clicking rapidly, but I'm also thinking that's what my valves sound like at high RPM. What I suspected was ping sounded like a small rattlesnake somewhere on my rockerbox. Not clearly audible unless you were paying particular attention to the engine sound, and although it seemed to stop when you let off throttle, it was very rhythmic. Is this just the sound of my valves?
The gap is good