There is one cable on the thumb throttle on the handle bar. On the carburetor end I see two cables, one that pulls the throttle plates open and another that pulls them closed. These two cables go up into the steering housing. How and where does the one cable from the throttle connect up with the two going to the carbs? I pushed the throttle in and it stays there. If I rotate the cam the cable hooks up to on the carb I can get it to return. But if I press the throttle again it stays in. I'm suspecting a return spring issue. But I can't figure out where that'd be.