FUTABA CGY755, Manual

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(3) Srv. Limit: Limit setting
When the CGY is in the "Srv.Limit" parameter mode, the gyro will no
longer operate and the tail servo will always center when the tail rotor
stick is released. Always exit the setup functions before attempting to fly
the model. Before each flight, always ensure that the gyros are operat-
ing and compensating in the correct direction. The Servo Limit param-
eter within the CGY is used to set the mechanical limits for the tail rotor
servo. To obtain the best performance it is recommended to set the limit
in the CGY to 100% for both directions and then adjust the servo arm
length to set the mechanical endpoints. After that has been completed,
use the servo limit parameter to make small adjustments that could not
be made mechanically. Values between 90% and 110% are considered
optimal. Hold the cursor to "Srv.Limit" by pressing the [ /+] or [ /-] key.
Gradually move the rudder stick to the left or right by the maximum
amount the " " cursor moves. Enter the setting mode by pressing the
[Enter] key, increase or decrease the maximum throw using the [ /+] or
[ /-] key, and then press the [Enter] key to exit the setting mode. Set the
same way on the other side. Ensure that the pitch slider does not bind
at the maximum movement inputs.
WARNING
When using the CGY for the first time, or when making mechani-
cal changes involving throw, you must check and set the servo lim-
its again to prevent binding.