Hi guys...... my gyro was working fine... I don't know what I did but now, the tail starts moving left to right and viceverse very fast before as soon as the heli starts moving... what did I do???? How do I fix it???? Thanks...

Reduce the gain. If you tail is wagging back and forth very fast it's usually an indication that your gain is set too high. Different things may affect how youy gryo is functioning...such as ambient tempature. Other things seem to affect it as well, which I don't know exactly - but that's why these things are adjustable. You should reduce your gain gradually until the tail stops wagging.

1. Does it work on the ground when you turn the machine off heading?
2. Does the led stay solid when you turn on?
3. Does the rudder stick work?
4. Are you solidly plugged into tx channel 4 and 5?
5. have you tried reversing the gy401?
6. Your gain should be 75-80.

If this all checks out, you should be good to fly. If you think it checks out, and it still rotates, you have missed something.

Correction. I said tx channel 4 and 5. It should read rx.

I see you posted another thread about a light/hard crash..Is the gyro acting up after the crash?

I think I fixed it.... due to the crash a screw got loose at the tail and it was causing trouble to the servo to move I guess that is why the gyro was just crazy trying to push and it couldn't.... it seems to be working ok... thanks for your help guys!!