A few things usually cause this...Built my first Multicopter the other day after the last of the parts arived. I got the Y650 Scorpion from Hobbyking, running from there KK2.0 board.
Havn't been able to get it off the ground properly yet, as it seams to be unstable, where it tilts to one side every time. I expect that after setting up all the ESC and performing a level calibration for the gyros on a flat ground, it would lift level, not fall over its self. Tryied everything i can think off, but its going to have to wait know as it snapped some props on its last attempt.
1. Props going the wrong way, double check both your motor rotation and prop directions, I know it may sound obvious but you can't imagine the number of people who this has happened to.
2. Check your pitch and roll axes don't need to be reversed.
3. Check your gains aren't too high, on a KK2.0 for your first flights, set the P-Gains to about 30 and the I-Gains to about 15, work from there. The stock gains are very high and work well for a hex but quads and tris need lower gains.
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