I never have those issues, if I stretch the outer long spring on the diaphragm so it has more pressure
to open the poppet,I can disconnect the vacuum line to the diaphragm and run it as a manual carby like the first Victa carbys with throttle control.If you decrease or increase the spring tension on either
side of the diaphragm you can change the way it runs.I just started the last mower that I put the
carby together and throttle control was good,has a good idle you can change throttle speeds and it
revs out but not over revving.I have noticed with old mowers with much lower compression readings
that they have less manifold vacuum so if you don't disconnect the vacuum hose,the vacuum hose seems to suck the diaphragm so the poppet is closed.
I believe most people leave the throttle position in the stop position when not using the mower,this compresses the outer diaphragm spring causing it to contract and loose its tension,thus making the
mower rev slow on full throttle.
