When you installed the new governor, did you make sure to see is the governor valve was free? To make sure, grab it in your hands and hold it with the gear pointing up, with your other hand, squeeze the bottom pieces together. When you do that, the gear moves up, let go, it goes down. It dosent take much to get them stuck. If it is stuck, a good wash in solvent could release it. At the worst, take the gear off and inspect the valve. You could have just replaced the gear.