When I bought the bike, it didn't have a bottom throttle cable - the one that connects on the bottom part of the arm by the carbs. It's the cable that "pushes" on the arm by the carbs. I bought a new set of both cables (upper and lower) from 4into1.com.
Is there a trick to putting the bottom cable on? Seems that no matter what I do, it just doesn't want to reach the bottom slot on the arm by the carbs. Seems simple, I just attached at the throttle handle and snaked it down to the carbs. There isn't any adjustment on this cable, unlike the upper cable which has an adjustment.
I'm attaching a photo with the word "HERE" written to show where the end of this cable fits.