Gyro Or belt hasn't been replaced.
I had replaced the stock cyclic servos with futaba 3114's, it seemed to fly fine,
just drifting a little bit so I leveled the swash, again it was flying fine when the tail
started acting like it was over-respondng to the inputs. Then it just started spinning clockwise,
(from the top looking down).
Now when the throttle gets above about midpoint the tail servo starts going back and forth
(mostly forward). The belt seems OK, switches are set right, tried adjusting the
gain, moving the servo foreward and back, tried a different servo, still spinning!!!