Chris Can you make video of the throttle movment with engine off so we can see what is binding?? Iy would be a big help.

If not then be very methodical about tracing the problem. First disconnect the carb linkage, move the linkage with radio. Also check the carb for free movement. if everything seems ok then remove the linkage from the servo and with it disconnected from the carb see if the linkage will move free if there is a bellcrank involved, but if it is directly connected from the servo to the carb, this step is not neccessary. move the servo with the radio, without the linkage to see if the servo is faulty. This method should be able to track down the problem


Good luck and have fun.. Let us know what is the problem!!