I'm rebuilding the carb at the moment, but I found that the engine wasn't really heating the spring enough to get things moving. It elongates off the pin with a heat gun though. I have seen the throttle cause it to move, just haven't witnessed it staying open before. Things got hot the other day and I believe the fuel boiled in the bowl, which never happened before the new spring. I will try it again, I was just curious if all the weights stayed in the horizontal position, without any spring pressure applied to them.
