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I read thru the thread a couple of times, did someone make a comparison? Unless you have a manual choke (if you dont have a cable to pull, it's not manual) your carb operates with a single pump before starting. Not a light pump, push at least half way. If your engine/carb is cold, a properly adjusted choke will engage to the degree needed. After the warmup, the the kick down you speak of will bring down to the low idle. Check out this info. https://www.youtube.com/watch?v=_BTEdWt2V3s&t=103sWhich one are you?