I have been in the hobby for a short while. I am 66 and a retired aerospace engineer. I have put stuff on the moon, but I can't get my engines to transition from idle, w/o shutting off! I am starting at an idle bar setting with the largest internal cylinder even with the venturi. Moving the screw in 1/4 turns, and still can't find a sweet spot. I have several books that don't address the low-speed adjustment. My OS 46 and 61 instructions don't either. Anybody got an on line reference or Clarence Lee's number. What's the fuel line pinch test? I'm on a test bench right now.
Any suggestions would be helpful..I have just ordered a doz of "Hots" plugs to try.