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On 4 servo 90, you want the front of the swashplate and rear of the swashplate controlling elevator. On the left and right sides, you want that to control roll, or pitch axis.
When standing behind the heli, the servos are arranged this way;
On the right side, rear servo, is pointing outside the frames, and connects to the side of the swashplate, this servo is plugged into the collective channel, or number 1 on the rec. The servo in front of this on the right side is for the elevator, and faces in the frames to control the front of the swashplate.
On the left side rear, this servo points inside the frames, and controls the back of the swash and is the aux servo for elevator, usually channel 8. The front servo on the left is on the outside of the frames, and controls the side of the swash, and is plugged into the aileron channel.
By using servo reverse function in the radio, get all servos going the correct way for the collective pitch function on the helicopter, meaning up for positive pitch, and pull down for negative pitch.
Once these are going the correct way, try the forward/back cyclic on the transmitter, and see if it is going the correct way. When you give forward, the front servo pulls down, and the back servo pushes up. If this is reversed, go into the swash mixer where it shows the three percentages of pitch, ele, and ail, and reverse the percentage. Default is +60. Use the rotory knob to make them -60 degrees, and this reverses the FUNCTION, so that it now will go in the correct direction. Do the same with the roll. When you give right roll, or aileron, the left servo pushes up, and the right servo pulls down.
Hope this helps.