What sort of rpm is the engine running at in the video? Sounds like about 2000-2200 It should only be at max 1700 rpm What happens once you kick the throttle after running for about 2 min? It should come down to at least 1200-1300 by then Do you know how to adjust fast idle speed? As far as the starting lids not closing equally, just loosen the 3 screws that hold the starter lid to the carb and rotate it until they are equal. There are 2 things to remember about the cold start The starter lid controls both how much pressure on the choke flaps to close them up when cold and for how long the choke flaps take to come right off as the engine warms up The fast idle screw controls the actual speed the engine will run at when choke flaps are completely closed
In a partially warm engine where the choke flaps may only come on lightly and not fully closed, there are steps on the fast idle linkage inside the housing where the starter lid attaches to, these will compensate for different fast idles speeds depending on how warm/cold the engine is and so when you kick it down, it is a gradual slow down back to idle as the engine warms up You may have to adjust the position of the starter lid as it warms up if you find one takes longer than the other to open Ask more questions
Thanks, Rick