4 star and 4 stroke throttle set up?
The bellcrank arrangement is nice, but adds weight and complexity, aside from needing plenty of room between the mount arm and the cowl side.
A better, easier way is a simple wire with a 180 degree loop. This gives you more flexibility on exit points, and provides a sort of built-in servo saver.
Sorry for the lack of detail in the pic, but I'm in the sanding phase, and I wasn't about to mount the engine just for one lousy photo...<G>