I am a newbie myself.. however i had have a problem like yours.. i have a 4 channel esky and after a bumping landing I notice that i was not getting any lift from the heli. I noticed that my top pair of rotors were not turning as fast as the bottom set. When i took my heli apart I noticed that my servo gear for the top rotor was not making contact all the time .. So i took the gear off from the top shaft.. reseeded it and made sure it was locked in tight.. maybe you are having the same problem just with the lower one..and the other part of the shaft.. Hope this helps a little..


anthony