Ok lets step back a bit.
Did you either clean or replace the little filter hanging on the fuel line in the tank?
That has to be clean or no, or a restricted, fuel flow will occur.
Lets try an easy trick.
Take what ever "tool" that fits the hi/low adjustment screws ( some are hex, slotted, "D" shaped and others to make them tamper proof) and seat them gently COUNTING the turns and write it down, for the hi speed and lo speed.
Usually along the screws it is identified HI and LO on the casting.
Then remove them carefully noting the spring, washer and "O" ring.
the "O" ring will either come out on the screw or remain in the carb body.
if remaining in the carb, remove it and put it on the needle screw.
Note: the hi, and lo needles are different, usually the hi screws are longer but not always so keep them separate and noted.
Then give a gentle shot of air into the screw holes.
this might dislodge any debris that might be in there.
Return the screws to their respective holes and set the adjustments as you noted before removing them
Crank it with the rope to see if it will fire up and run.
if it stalls when you let off the throttle try enriching the lo speed needle 1/4
(CCW) turn, then try again,--possibly adjust the idle rpm's with the screw that holds the butterfly open a bit.
Hopefully you can get it to purr like a kitten, adjusting the screws a bit at a time.
The Carb might need a kit if the diaphragm's are bad.
You could try your new carb also, or "borrow" gaskets/diaphragms from it.
Chi--naaaa replacements are a crap shoot, some work right out of the box others are junk, and some of the parts do not interchange with the OEM carb
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