My Taurus and Brison engines use bellcranks with no problems at all. In fact, 2 Brisons still have mechanical advance and work very freely and slop free. If I have ever had a problem with bellcranks on throttles, it was from trying to use cheap ones from the airplane market. Ones designed for heli use have ball bearing pivots and are very precise ... these work great for throttle bellcranks.