Its Hard to say What the Problem is with out seeing the heli, can you post a video, one blade should be spinning CCW and the other CW, they should both be spinning at the same speed, the blades could be out of adjustment, the motor to gear could be to tight or to loose, one of the motors could not be working, the main shaft could be bent and binding, just to hard to tell what the problem is with out seeing it, take care, Chellie
The Videos Below will give you a General Idea of what to look for.
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