ORIGINAL: Hobbsy
My method above is virtualyl friction free. The throttle requires nearly zero effort to move.
Which are exactly the same reasons why I like a bent piece music wire. Strong, light and simple.
What Hobbsy proposed is good. The end of the (white) lever is pivoted, the wire from the servo is connected at one point and the lead to the carb is connected at another point. It's basically just a way to change the direction of the force being applied to the throttle.
Jack