I always try to set my throttles such that the fully closed position on the carb barrel (engine cut off) is at the farthest point of travel on the servo arm (100 percent throw) and the servo arm is either pointed directy at or directly away from the carb (depending on your throttle movement). Setting it this way causes the throttle barrel to move less for a given amount of servo travel at the low end. This helps account for the increased sensitivity of the engine RPM to throttle movement at the low end, resulting in a more linear throttle response. I then adjust the geometry to provide maximum servo travel to get to to the fully open position by selecting which holes the connecting rod or cable is attached to. Finally I use the end point adjustments on the radio to fine tune the low and high throttle settings to prevent jamming the barrel or adding undue stress to the servo by pushing or pulling against the stops.

By starting from the mid point, you're setting yourself up for having most of your throttle response before you get to the halfway point on the transmitter. I hate to count the number of pilots I see that think they're flying at half throttle, but are actually at 75-80 percent already.

Brad