i have the ct4s can anyone help me adj my carb and is it ok to ru 20% NITRO IN THIS CAR

20% is fine

When i adjusted my carb on the MT2 the screw by the gas line that controls the amount of fuel was all the way out, screwed it in most of the way and backed it out as needed, with the low speed I turned it really lean, backed it out till it didnt stall when taking off, then turned it a little more rich to make sure i didnt run it too lean.

The high speed screw i am still working with i have it bog down a little at high speeds But when I stop breaking parts i'll get to that

Tiny

I wouldn't do it that way running it lean is never a good idea. Set your high speed needle about 3 1/2 turns out from tight and your low speed flush with the metal part of the arm. Set your high needle first by doing high speed runs and leaning it out very slowly. Run it about a minute with each setting so it can take effect. Screw it in 1/8th of a turn at a time, making sure you have good smoke coming out of the exhaust. Once you get to a point it doesn't get any faster back it out 1/8th of a turn, and it will be set. Next set the low speed needle. lean it out very slightly. When I did mine I didn't even turn it 1/8th a turn at a time. let it sit then punch the gas and see how fast it takes off. If it is sluggish then it is too rich, if it revs high but doesn't have power then it's too lean. make sure you do some high speed passes in between settings to give them time to set in, and clear excess fuel out of the carb.