Throttle forward/backward direction is reversed (KT-18)This entry was posted in All Categories Troubleshooting on December 5, 2017 by Takuji Fukumoto If you use the Perfex KT-18 transmitter, you can reverse or change back the throttle direction by press and hold the backward trim button, (1) in the diagram below, for about 3 seconds until you hear a short beep tone.