There are some key points you should not miss on the KK. Haven't got mine in front of me so I prob haven't got the terms below right
- but you should find what I mean in the settings:
1. Motor/Rotor layout- you need to tell the KK how many motors and what configuration (shape / arrangement) they are in.
2. ACC calibration - To calibrate the gyros against a level position. There is a menu for it, put the craft on a stable surface then select it and let it run.
3. ESC calibration - To ensure your ESCs are calibrated with the min/max throttle and that they all start at the same time. Do this with PROPS OFF! Power the board quad off, turn your receiver on, put it at full throttle, turn the power on and quickly press the first and last buttons on the KK (not the middle ones). It should display 'throttle bypass' or something similar. You should hear a beep from the ESCs, then drop the the throttle to minimum and you should hear another beep. Done. Release the buttons and test the throttle. All motors should come on together (if the craft is level)
4. Check the inputs on receiver test. They should all read zero in the middle, if not adjust the Tx subtrims to ensure they are.
5. Gains - Have a look above in the past 2 pages for some info on suggested gains settings for a
FPV250. (edit)
With Auto Level, I use (noob controlled settings)
P Gain 65, P Limit 100, I Gain 30, I limit 20 for Pitch/Roll
P Gain 65, P Limit 20, I Gain 50, I Limit 10 for Rudder
And Self Level (separate menu) P Gain 75, P Limit 20
6. Setup the low voltage alarm - Assuming you are using a 3S, have the battery connection to the KK, I set mine to 105 (10.5V) in the menu under Misc. Settings 1, Alarm 1/10 Volts
7. Mode Settings - set "Self-Level" to AUX Channel (if you have a spare channel on the Tx, My gear switch is set to this to enable auto level on and off.
Also a handy manual here:
http://www.quadkopters.com/wp-content/uploads/2014/02/HK-KK-2.1-manual.pdf
(this suggests you need to cut power from some of the ESCs to the KK. I'm sure my KK2 1.5 only takes power from ESC1 so I didn't bother and it works!)