The governor is connected to the vacuum button on the crankcase. It is basically a small hole with a vane, vacuum is created by the spinning flywheel pulling air away from the button. Blow through the hose going to the button it should be clear/unblocked, if this is ok check it is tight against the block and located correctly by the dowel/pin. If you are still getting no vacuum to the governor then you have a vacuum leak. Don't assume anything looks ok, replace the starter and inlet manifold orings with genuine victa orings. Be thorough and clean with your carb re-assembbly, before you refit the top spring, set the throttle to to the idle position and check there is virtually no movement in the poppet valve ie it is almost completely closed. I have not yet experienced a lower crank seal leak, or leak from the starter itself.
