Let the engine get up to operating temperature before making adjustments.

Use the oil/fuel mix you will be running in that engine. A different mix/oil product may have a different viscosity which will affect how much fuel will pass through a given orifice.

Make only very small adjustments no more than the thickness of the screw driver blade. Wait until the carb and motor catch up with the adjustment you just made. Unlike the nitro engines it’s not necessarily instant. I have seen guy fail to wait for the carb/engine to stabilize keep making adjustments and go right past the optimum setting. Take your time it’s not a race.

Be reasonable when you open the throttle you can snap it open by hand much quicker than a servo can. These carbs usually do not have a fuel pump and opening them to quickly tends to zero the vacuum. With piston ported engines this can cause fuel to spit back out the carb and the engine to quit abruptly as if too lean. Reed valve or rotary valve is less susceptible to this. There is no need to open the throttle faster than the servo will open it.

I like to ease the motor to full throttle and set the high speed. The transition thru mid range is now set with the low speed needle. Remember after a few adjustments on the low speed recheck and adjust the high speed as needed.

Dennis