SteveSr
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The cable must be adjusted to allow the full range of throttle movement. At WOT the carb throttle must be fully open. At idle the throttle must rest on the screw stop on the carb and the cable should be slack.Well, @SteveSr, I tried adjusting the start/throttle assembly and the screw adjustment at the plastic loop above carb and it wouldn’t idle down till I put things back a bit the way they were.
The accelerator pump is located behind the brass plug on the throttle shaft bore near the throttle arm. If you have a pump problem (unlikely) you need a new carb.Well, @SteveSr, After reviewing the manual Harley put up I took the carb off again and tried to remove the accelerator pump and it wasn’t there, go figure.
About 3.5 is where I found this one set. If it is that far off it would answer a lot of questions about what happened to this one. However, opening the throttle to WOT and having it bog/stall seems to indicate not enough gas.Well, @SteveSr, I tried the H at 3.5 turns and it stumbled bad. Put it back to 2 turns and it runs at 9600 rpm at not quite full throttle but if I squeeze the trigger further to stop it stumbles.
It sounds like you, at least, have carb issues like stiff diaphragms or perhaps incorrectly assembled by p. o. Replacement price will depend on which Stihl distributor territory you are in.