My yarn twists back on itself, what am I doing wrong?

There is too much twist in the yarn. This is caused by:

1. You are treadling too fast relative to your drawing of the yarn with your hands.
2. The yarn does not pull in sufficiently. You have to slow down the flyer (Irish tension) or bobbin (Scotch tension) apply more brake tension.
3. The yarn does not run properly through the guides.
4. The bobbin is full.