hs 81 problems
 

I have a couple of Hs 81's that I changed to metal gears on, when I put the servo arms on at 90* turn on the radio and power to the rx and move the stick up on the radio the servo arm returns to 90, when I move the stick down and back to center the arm moves past 90 and stays there. I have tried it with 2 different receivers a berg and a futaba, and 2 different radios a 9C and a T6xhs. Anybody know what the problem could be?

hs 81 problems
 

Is this with nothing attached to them?

hs 81 problems
 

yes I tried it not mounted to anything and on my Corona....

hs 81 problems
 

when it moves past 90 it goes to the end of the range of motion but it doesnt seem to return to the same center point as when the stick is moved in the opposite direction.