Yaw is unstable on quad

[phenolic]

If I give full left (CCW) yaw my quad will gain altitude and drift to one side. On full right yaw (CW) the quad will become unstable, angle over to one side, and start drifting and losing altitude.

What is going on here? Is there anything I can tune to make it rotate nicely centered?

I using MultWii_shared r1253 and the default PID settings with PID rate of 0.3. MPU-6050 in acro/rate mode.

[vpb]

Hi, have you checked the correct ESC pins connection? Do you use CCW + CW props and are they mounted in the right direction?

Look at that http://www.multiwii.com/connecting-elements (Atmega328 or MEGA).

[phenolic]

Yes, motors and props are rotating the correct directions.