Здравствуйте Whirlybird!
Yaw works on the KA26 theoreticly pretty simple way: when you push the right pedal the blade pitch angle on the upper rotor increases and on the lower rotor decreases. It gives the yaw moment to the right which in turn with conjnction with the right bank gives you a perfect right turn. In auto-rotation the rotor system works the same way as the conventional helicopters. Basically there is no difference in the rotor theory except the tork compensates with the other rotor not with the tail rotor.