/diy/ - Do It Yourself

>>https://archive.org/details/lawnmower_202001/page/n5/mode/2up?view=theater
greetings,
i bought a second hand mower and its giving me somewhat trouble.
First of all, it never ran right since i bought it a few weeks back.
filter and plug were replaced. I had to change the throttle as the plastic one broke and since it never ran right it obviously needs a carb readjustment.
The manual says adjust throttle cable (green circle) until the screw (missing, red circle) touches the casting. Since the screw is gone i have no fucking idea what the factory setting here is for the governor tension.
Step two would be to lean the engine (screw orange circle) until the revs drop and then turn back half a turn, but if i lean the engine with full throttle it will rev way past 4000 rpm an i know this is not safe to do

How the fuck do i readjust this? what is the proper order here? Also, how does this thing choke itself when cool?
The engine is a 185cc 3hp L head