As a TEMPORARY fix I once had this happen... what I did was... you ready for this? put the "push" cable end on the carbs where the pull is... Now operate your throttle backwards (roll forward to accel) *what you do to your bike is what you do to your bike... you asked for a temporary fix... this works in a pinch but if you do this, you accept all responsibility.
This will get you home if you are stranded but it does take some time to get used to