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They're chineese, of course they have QC issues!
It might be fake, it might be real, heck the new one might be fake!
Just remember the next time you need some part for the other one that you have this old one for ripping into.
Good to see that you're at least not giving up from one problem.
(If you use it as a 2ch, I'd make it a 2.5, and add some weight to the nose so it goes foreward)
Thanks for your help! I think I will just use it as a 2 channel heli again. By the way my new one arrived today... lots of small differences on the heli and even the controller from my old (broken) one. I wonder if the old one was a fake or if they are just not consistent in their construction.
No. There's something giving it power 24/7 that shouldn't be giving it power at all. From my experience with electric motors, the wires connnecting to it have to be getting the draw. The motor is on a separate, closed circut, but it is supposed to be on an open one when the MB isn't telling it to be closed. Either a diode or whatever on the MB isn't working them, or something. Something should be acting as a switch to tell it to be on, off, or on reverse. Maybe that got buggered up in a crash...
I personally don't know how to fix one of those, but SF might be able to tell you how.
I have a feeling you might just need this one for parts, though...
It's time may have come...
Hey CPD, i thoroughly inspected both sides of the mb as we discussed in the chat earlier. No signs of damage that I can spot... Could it be that there's something wrong with new motor?
Good! But, are the wires to the board, or to the old wires??
If it's to the board, sounds like a random strand or two may be touching a part of the board they're not supposed to touch.
Thanks for your reply. Good question... I didn't solder yet! I simply cut old wires and reconnected new and wires manually (with tape actually). I wanted to do a quick test which colors to connect to which before committing it to the soldering gun. Can this make a difference that I didn't solder the new wires to the board yet?
I think you might have mis-soldered a wire somewhere. Did you cut the wires to the old motor and solder on the new wires to the old ones, or did you unsolder them, and solder on the new wires direct to the board?
It could also be the same problem, just it may be a coincidence that it happened the same time as you needing to replace it.
Hi, I've also got a problem with the rear rotor always spinning but it's quite different than the problem listed above. My heli worked fine out of box until the rear rotor stopped working completely, probably as a result of multiple crashes. I removed the motor and flew it as a 2 channel while I waited for a new motor and boom to arrive. Got it yesterday from amazon, got it all put together and the rear motor spins constantly as soon as the battery gets charge, doesn't matter if the helicopter is turned on or off, nor does it matter if the remote is turned on or off... Any ideas out there? What have I done?!
Glad the problem is sorted 
I think because they sell thousands of them there are bound to be some that are not finely tuned in.
Supernova, thanks again for starting me down the right track. My son's helicopter flys perfectly using his friend's controller so the problem is my son's controller is always sending out a 'full forward' signal to the helicopter regardless of the stick or pots position. We'll either return the defective controller or buy a new one - regardless he should be back to enjoying his favorite Christmas present very soon! I think dad might just need to get an S107 for himself.
I really appreciate your help,
Tim
All the pots do is to give fine trim in the direction the stick is moving.
I have 4 controllers and I only use the one that works without need for any adjustment to fly my copters, I give the ones that are not spot on to my guests and they think I am an expert pilot, sneeky eh!
Try the different Controller and see, should be ok, if not, as SF says let us know.
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tknx5827 -Supernova has given some great advice-let us all know how you go
"Fly like a butterfly sting like a Syma" http://syma107.com
Thank you for the response/suggestion! I assume the thing I'm supposed to be turning on the adjusting pot is the black plastic piece in the center (with the slot for a small screwdriver), correct? Well, I first turned it very small amounts in both direction but no change (helicopter still always wants to 'nose over'). I then turned it by large amounts in both directions but still no change.
I did however notice a significant diffference between the 2 adjusting pots. When I move the right stick side to side, the plastic piece in the center of the 'front' pot (by the ZD3 diode) rotates and returns to its original position when the stick is released. However, when I move the right stick forward and back, the plastic piece in the center of the 'side' pot rotates but does not always return to its original position when the stick is released. I know nothing about 'pots' but I'd conclude the pot on the side is not working correctly.
My son's friend has a S107 as well. Tomorrow I'll have him test his helicopter with his friend's controller.
Thanks again for your input,
Tim
Hi Tim, and welcome to the forum.
I would think it may be a problem in the controller, if you take out the batteries and remove the back, there are 6 screws one is under the charge cord compartment.
The right stick has 2 adjusting pots, usually green in colour very carefully turn the one on the side with a small screwdriver. (not the one next to the diode marked ZD3!!!) Try one direction first then fly to see if it gets worse or better then take it from there.
Warning !! dont forget the position it started in!! and turn it in very small! increments.
Hope this helps.
Hello everyone, I bought my son an S107 for Christmas and he was able to fly it right out of the box - very impressive. However, even during the first battery charge (prior to any major crashes) the tail rotor would start spinning during takeoff. If only the left accelerator control was used the tail rotor would still spin. This problem magically went away and he was able to enjoy flying. He of course has had some crashes since then. Overtime the tail rotor spinning problem has gotten more and more common until the point now where it always spins.
Now if you use only the left accelerator control to spin the main rotors, the tail rotor always spins counter-clockwise (viewed from the top). If you push the right forward/back control (either direction) along with the left accelerator control the tail rotor always spins counter-clockwise. If I take off the tail rotor the helicopter will hover just fine.
Any help will be greatly appreciated - Thank you,
Tim
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