I’d start by checking the simple things first. Make sure the connector on the YIKONG 17g Shift Servo (Part No. 13119) is plugged in securely and that the wiring isn’t loose. Then check whether the shift linkage is stuck with dirt or mud, or if the shift fork has moved out of position. If everything looks fine, see if the battery voltage is too low or if the servo gears are worn out. If the servo doesn’t respond at all, there’s a good chance the YIKONG 17g Shift Servo (Part No. 13119) itself has failed and needs to be replaced. In most cases, checking these items in order will help you find the problem quickly.
