Which direction did you move the cam/plate? The one picture you showed would indicate that the cam is not holding the throttle open…But, like I said, the linkage on these 10hps can be tricky. Pulling the choke on activates a linkage that pulls the throttle open a bit. Those two arms/short rod on the other side of the carb have a tendency to wear/bind, which could hold the carb butterfly open as well.
I wouldn’t pull the head just yet, but do pull that thermostat cover back off. Poke around in there with a probe looking for passages that are plugged with salt debris. Sometimes the blockage is in the cap itself, a little salt build up preventing water from circulating through the head. Sorry, but it is kind of hard for me to describe without having the parts in front of me.
