I just did a bit of research on the function of the vacuum cut out switch and was surprised to learn that the switch functions to momentarily cut out one cylinder when the motor tries to overspeed in NEUTRAL during idleing. This in NOT a high speed, in gear wide open throttle cut out. The engine sees highest vacuum at idle when the throttle is closed, lowest vacuum at load and throttle open. However still no info on what vacuum lever closes the switch. I’ll attempt to attach the tech article with full explanation, here…
Joe B