With the carb you ordered from Amazon, you will need to change the pilot and main jets (20 and 100 respectively). They are too lean for a 230-250cc engine at lower altitudes (I am at 1000ft)
Pilot jets are VM28/486. At minimum you will be looking at a 25 pilot jet, I found a 27.5 to work better on my CG250 with about 1 1/4 turns out on the idle mixture screw. That will at least be a good starting point.
https://www.jetsrus.com/a_jets_by_ca...-486_pilot.htm
Main jet - N100.604, I would say start with a 115 to safe. You may find you need some "half" sized jets to get the tune really dialed in, aka 112.5 and 117.5. If you happen to know the stock carb main jet size, I can translate it from Keihin to Mikuni size easy enough.
Needle clip position in the 4th notch from the top/1 down from center to start, with the right main jet you should be able to run the center clip position.