I have a McCulloch 1-72, I cannot get it to run. 150psi compression, exceptional spark (I cleaned and regapped, and set the coil gap too), carb kit and factory tuning, no air leaks. Starts on prime every time, but will never pull fuel. Maybe I need a carburetor? I dunno, but if anyone has a Tillotson HL that'll fit this saw, lemme know, and I might just jump on it.
Keep in mind that this style throttle linkage HOLDS BACK the throttle shaft in idle position, and when you depress the trigger, it brings the throttle linkage forward and a spring on the throttle shaft rotates the shaft, opening the plate, as far as the throttle linkage will let it open.
Thanks,
Bryan