Alex your CX has a (4 in 1) that both motors are pluged into. This (4 in 1) controls the birds flight but more importanly the motors. As the bird is flown the motors get weaker and at some point need adjustments of the rudder trimbut when the rudder trim can no longer correct the rotation problem you will need to get back into your owners manuel and see how to adjust the mix trim pod on the (4 in 1) and if you run out of adjustment there you can doa motor test by simply reversing the plugs. It the bird spins in theopposet direction you have a warnout motor. Good luck and happy flying.
Baggy