[Jbone 11 11]

I have just reassembled my G&G GR15 raider and its making an awful noise when I pull the trigger. Kind of like the gears are slipping and not contacting completely. At first I tried adjusting the motor via the screw at the bottom of the pistol grip, but does not help. If I turn it all the way in, it will not fire. All the way out and the shrieking sound is worse.

So I figured maybe I did not install the motor properly and it was not sitting all the way in. It was then that I noticed that one of the leads from the gearbox is pinched quite badly. Could this be causing these types of symptoms?

Also, I had a couple of Lipo's that had been sitting for a while with out being charged up... they had some juice left but Im not sure how much. Wondering if a really low battery could also cause this type of shrill, shrieking sound??

Any insight into this is much appreciated.
J