what I do is move the servo to what will be idle.....close the throttle trim all the way down...then open it up about 3 or 4 clicks......now close the carb.....adjust the pushrod to fit between the hole in the carb arm and the servo arm by sight...now hook up the pushrod.....this shoud give you a closed carb with 3 or 4 clicks of trim left just to be sure....now..open throttle trim so that you have a small opening in the carb throat..... with the throttle stick on the transmitter make sure you are full open...I adjust with my radio if required...... make sure that the carb closes with stick down, to idle, and that you can close the carb completely with trim...