Thanks j-d, but I don't think that's it in this case.
But yes. Hunting is probably the right term.
dougrainer,
I'm pressed for time and couldn't locate the oil sensor, though I have an idea of which wire it is that goes into the control box.
But I did have time to try that "B-12" idea... only with Gumout carb and choke. Here's the report...
Started 'er right up. "Hunted" like mad for like a minute. Then I took hand of the throttle and smoothed her out, myself. Only took a second. Then she ran perfectly smooth for about another minute. Then she began to do that little fade and back to full thing. Then a bit later a full, single drop and return to full. Did this about every 10 seconds. 1 drop... followed by full throttle... and then return to standard "idle."
It happens to quick to compensate with spray, so here's what I did instead. Knowing that she surges about every 10 seconds, I just gave the air cleaner a good spray. After this she would run much longer and then, eventually return to the 10 second surge and return to full idle routine. In the name of (pseudo) science, I repeated this process about a half dozen times. The results were the same. And after the last time, she would just go on her 10 second routine over and over. I am very satisfied with the results of my lab work here.
So according to your post, there is a fuel starvation problem, yes?
