Had to take the carb out and clean it (replaced all jets) but also had to remove the throttle cables from the carb, now I can't get the throttle (on handlebar) to spring back like it did. Which one should be tighter the pull cable or the return cable? I need the handle to spring back like it did before so the bike doesn't race. Is there a trick to this? Please help, this is my last obstacle before I can ride it! Thanks!!