Thats far from the ideal servo for that gyro but you need to do some checks to make sure its hooked up correctly.
On the bench, give RIGHT rudder, the tail blades should change pitch so as to push the tail to the left (nose right) if thats wrong reverse the rudder channel in the transmitter. On the Raptor the servo should pull the rod towards the front of the heli.
Now pick up the heli and turn the nose to the left (counter clockwise looking down) and again, the servo should pull the rod towards the front (giving a right rudder command to counter act the left turn)
If thats wrong flip the nor/rev switch on the gyro.
The above assumes the tail rotor and belt are mechanically correct.