You really don't need to run both cables. Many XR owners just use the pull cable. (The one with the extra lock nut on it.) The pull cable goes from the bottom hole on the throttle to the top of the carb bellcrank. The carbs have a strong return spring and the return cable is not necessary. If you have both cables, tape the return cable to the pull cable but don't hook it up. This spare return cable will work as a pull cable if you break the pull cable out on the trail. It will get you back to your truck.
Good luck. :cool: