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kris7404 said
Never mind!!! I didn't have to replace the actual main shaft! I did the full repair on the black piece just as the video shows and it worked!! It flies great now and my kids think I am just awesomeThank you so much for all your help!! By the way, it actually took me 14 and a half minutes to do the repair because I kept playing and pausing the video to get the next step and those darn screw are sooooo small....
Same here it took me ages 
hope all is well now.
kris7404 said
Never mind!!! I didn't have to replace the actual main shaft! I did the full repair on the black piece just as the video shows and it worked!! It flies great now and my kids think I am just awesome
Great!
Never mind!!! I didn't have to replace the actual main shaft! I did the full repair on the black piece just as the video shows and it worked!! It flies great now and my kids think I am just awesome Thank you so much for all your help!! By the way, it actually took me 14 and a half minutes to do the repair because I kept playing and pausing the video to get the next step and those darn screw are sooooo small.... 
CPD said
Whoops, must be a slightly wrong video then. It's actually much easier, if the top isn't broken too. You unscrew and remove the top as shown, although not completely disassembling it, just taking it off of the shaft, then hold down the bottom gear, take a pair of pliers or multi tool and pull the shaft, then put a new one in, just being careful to not bend it, and put the top back on.
Keep the top from the new one around in case yours breaks, and I'd even keep the old shaft, but just as a last ditch spare if you can straighten it a bit.
Grrrrr...ok, so I finally received my ordered main shaft and tried to do as you say above and I'm not having any luck getting the shaft out. Just how hard do I have to pull?!? I don't want to break something else!!
Hi all I’m chea from the isle of wight, south cost of UK, I’m new here and new to this hobby. I was bought one of these for Christmas and was very excited........only problem is it doesn’t take off. Its fully charged and all that happens it it slowly spins round clockwise. If i turn the adjustable trim (?) knob one way it slows the spinning down and if i turn it the other way it speeds it up but it doesn’t stop it. Moving the control to up tilts the tail down slightly and moving it to down lifts the tail slightly but it won’t take off. I wondered if anyone had any ideas as being a gift it will be awkward to return it. Thanks for taking the time to read and hope someone can help
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Whoops, must be a slightly wrong video then. It's actually much easier, if the top isn't broken too. You unscrew and remove the top as shown, although not completely disassembling it, just taking it off of the shaft, then hold down the bottom gear, take a pair of pliers or multi tool and pull the shaft, then put a new one in, just being careful to not bend it, and put the top back on.
Keep the top from the new one around in case yours breaks, and I'd even keep the old shaft, but just as a last ditch spare if you can straighten it a bit.
Question: Is the part I need to order the Main Shaft S107G-13? The video shows replacing only the black part at the top...stupid question...but after I receive it I can take it apart, right? So I can just use the black part I need? Sorry to sound so dumb...I'm an accountant, not a whatever you would call someone who can do this type of repair effortlessly.
ok. It will probably take me longer than his 6:43 to make the repair, but I'll give it a try! I'm going to order the part tonight and I'll post back here after I attempt the repair. Thanks so much for all the help! 🙂
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Thanks to CPD for getting these videos posted again! I also hope this helps all new members
whom might have the same issue!
This is a VERY exaggerated case of TBE. Yours will probably just do it a slight bit, and much, much slower. It could also be caused by strange air currents, or the oddball effects objects have. Just flew some today, and the beds in my dorm room really mess with flights, even with the furnace fan turned off.
Here's a video by Supernova on how to fix it, considering it's most likely caused by a bent main shaft, probably from a crash or ten.
Hope this helps!
Hi - thanks for the advice! I tried the gear-slip fix and it doesn't help the situation 
The blue Syma works just fine so I compared the yellow Syma to it before trying the fix and the gear placement looked exactly the same on both. So that's probably not the fix I need. What would you suggest next? It would be helpful to see a video of ones that don't fly properly attached to videos of possible fixes!
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Hi Kris, and welcome to our forum! You chose a great place to learn about these little guys,
pretty soon you'll able to impress your boys with your knowledge!
What you have is classic ( don't laugh ) toilet bowl effect. This can be caused by another term
what we call gear-slip. There are lots of ways to fix this, so here are the links on our forum,
per your request:
From the forum home page, scroll down to " Syma S107: Tips and Advice" , then open
"Frequent Syma 107 Problems and How to Fix". It's all there!,,!!!!
Hope this helps! Please post back to let us know how you did!
I bought two of these nifty Syma S107's for my two boys for Christmas and they absolutely LOVE them! They have had some crashes and I've been learning how to make minor repairs (tightening and bending things back - the boys are in awe of how well mom can fix them) but now I think this last crash will be more challenging to fix. Everything looks good, but after taking off, it won't hover because it immediately starts doing crazy back and forth and sideways (sometimes circling) movements when it lifts just a few inches off the floor. I've been trying to search your site for help, but I'm not good at navigating/searching with the correct terms so I haven't found much to help me yet. Would you please point me in the right direction? Thanks!
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