Originally Posted by cpstout
I found the answer to my problem at helifreaks.com. I'll just pass it on:
"I mean you may have too much positive pitch when you push the collective stick all the way up.
If you have too much positive pitch it can cause the main motor to pull too many amps, this can cause the tail motor to not get enough power to keep a good tail hold."
When I replaced the main shaft the head must have sat lower because of where the main gear was on the shaft & when I gave it the throttle it put too much positive pitch.
Never though of that!!!
Most would not of wanted to embarrass you by asking if you had rechecked the setup before trying to fly it after doing a major repair like replacing the shaft....