Tomorrow am setting up the throttle on my DA-120. The thing I always find hard is finding the exact center point of the throttle arm on the engine so that I can set the linkage to this on servo centre. I don't like doing it by eye, it's inaccurate. What are the tips here for fixing the correct position of the throttle arm?

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follow the link as posted above, you dont want the servo centre and carb butterfly centre at the same position - you need a good mech expo set into a gas throttle.