I have one of these S107 helicopters that had been left in a cupboard 2 years because it as completely uncontrolable after a hard crash. Examining it carefully in the top rotor area, I found it had exactly the fault you describe here in the video - broken lugs on the top plastic drive shaft. Once I realised what the fault was, I realised I could repair the shaft with some tiny screws I had in a glasses repair kit. I used a hot needle in a holder to make small holes at the centre of the sheered off lugs, and then screwed in small, self tapper screws. These took the place of the broken off lugs and fitted the recesses in the rotor/gyro plates pretty well. Once the repair was done, the helicopter behaved pretty well and was controllable and now has a new lease of life. The only fault is a small out of balance effect which causes the hovering heli to hover in a circle ,not stay exactly still in the air, but to wander slightly. The nose points forward, but the whole body wanders in this little circle. Perfectly flyable though. I think the newer version of this toy helicopter will be less likely to break the lugs off than the s107, because it has a power cut off when it crashes, so no more thrashing on the floor when an inexperienced users leaves the throttle wide open.

THANK YOU! My son broke this part on the S109G after two days (many crashes). The four blades were badly nicked, so I was going to order those, when I took this apart, the two pieces of broken plastic pin broke off. Thanks so much for saving me more frustration in fixing this.

Thanks for the great and easy-to-follow repair tutorial! This simple repair fixed my previously dysfunctional copter perfectly.

The problem was exactly as you described. Helicopter repaired this morning & it's flying perfectly now. i've now ordered 3 more Top Rotor heads, just in case.Thank you very much for taking the time to do the the video, it's invaluable!

I just finished repairing one of these. I discovered it accidentally rebalancing the balancing bar. Both pins broke off. I took my dremel tool and bored through the main piece partially from both sides at the point where the pins broke off with a diamond point. Then by hand I used a 1/16th drill bit (broken tip hex drive) and slowly twisting back and forth drilled completely through without any problems. Zero room for error. Since the bit was already broken I pushed it all the way far enough to cut off both ends and leave the remaining as the new pin replacement. Well that looked good but was not that simple. I could not put the rotor back on because the copter drive shaft goes through this piece. I had to take my new pin back out and cut it in two. I cut the pin put everything back together and it will never break there again. That's hardened steel. Next day here I am watching your video. Yesterday I couldn't find anything on the topic. It's great you made this video because that break point is easy to overlook if you have never taken one of these apart. Nice Job.

I can't thank you enough for posting this video. Mine's all working again now thanks to your instructions. The only other thing to say was about when replacing the blades to remember that they have to be fitted in the opposite direction to the base blades of you're replacing them with new ones. Other than that a really helpful guide.

Thanks! My 107G was wobbling a little after a crash, it was till flyable though. After watching your video I took it apart and found only one of the tabs was broke on this shaft. Thanks for taking the time to post this video!

Thanks for this! Couldn't see where the problem was until you pointed it out and then it was an easy fix!

thanks mate. you helped me fix mine too with these parts - Syma S107 S107G Gyro Helicopter Top Blade Grip Set and SYMA S107G Main Shaft Syma Spare Parts S107G-13 UK

I got one of these for Christmas, before it broke (on New Years Eve!) I saw this vid and was able to repair it. Thank you for this! 👍

You rock. I know nothing about RC helicopters, but I thought something was amiss with the top blade... I just didn't know what it was. Also, thank you for explaining things via voice, rather than by annotations and playing some kind of crappy music.

I had that problem but never noticed the two plastic pins being broken! Many thanks.

Thanks for your video. It helped me to replace the little part which keep the heli in balance. I only fixed all parts and the rotors and then I put the complete set on to the main shaft. My heli flies now as it did when I just bought it. Thanks a lot. Johan.

Great explanatory video, tried it and my chopper worked perfectly.

had the same problem! Thanks very much for making this video - before I saw it I thought I was going to have to take whole heli apart to replace the whole main shaft, but you showed me how to replace the rotor only.

Thanks for the simple and clear instructions, I replaced the blades and still had a problem and was happy to find this video showing the problem!

Great video - Thanks!!! I was back in the air in ten minutes after I got the parts kit I bought on ebay and watched your video for help to change the hub.

Thank you for the instruction. I used it to fix my Cobra X107 mini helecopter. Parts are essentially the same. Parts from Cobratoys were crazy expensive. Got the parts on Amazon (Syma 107G) and they fit just fine. Cost me $2.99 US with free shipping.

Thanks SO much! This was perfect and allowed me to fix my son's beloved helicopter.

jomichael32 Link for the part here. www.amazon.com/gp/product/B004N37Y8Q/ref=as_li_tf_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B004N37Y8Q&linkCode=as2&tag=multibladehel-20

Brilliant, fixed my oscillating out of control flying problem... thanks so much

Thanks for the help. Your instructions helped me fix the same problem on a Skytech M15 helicopter too.

This was very helpful indeed. Thank you so much! After I watched your video, I stripped mine down and discovered exactly the same problem as shown on your video.

I used super glue to attach the broken pins and it worked great. Didn't have to buy spare parts!

Thank you, finally confirmed my suspicions that the bar dose connect to the rotor head. The way ours is broken just looks like the bar sits in he square loosely.

Thanks for uploading this - after following your instructions I was able to identify the cause of my control problem, spare parts on the way :)

@2:50 easy when the lugs that have sheared off are not still inside the mounts :-) I had to resort to a red hot needle to dig them out! Great video by the way!

Brilliant, fixe my oscillating out of control flying problem... thanks so much

Thanks a lot, just ordered the part after checking I had the same problem (the two plastic pieces were broken)

man your video was a great help for me .i just faced with this problem and iam going to repair it .but the problem is i aint have a replacement part.i'm gonna glue it.

Absolutely brilliant, thank you and one happy son!

great vid, very helpful, spare parts arrived today and i'm flying again

Thank you SO much for posting this! I was going nuts trying to figure out why I was having issues! :P

Many thanks for sharing. I watched your video step by step and found it really easy to follow.

Man, THANK YOU my airplane hit the wall and that same piece broke off.

LOOK HERE. www.amazon.com/gp/product/B00Z9KYQOW/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00Z9KYQOW&linkCode=as2&tag=multibladehel-20

Thank you for this video, You just helped me understand what is wrong with one of my Syma

instead of buying a new piece i just took a needle about the same size heated it up and stuck in in the place of the nub. cut it to length. then super glued it in. works like new

EXCELLENT VIDEO. Using this video I was able to fix my sons Syma and I am NOT very good at this kind of thing. ***note for the others with broken Choppers, a Syma S107 repair kit on Amazon will only cost $3 or $4 bucks. Well worth the money.

Great video, thank you. You should have been a brain surgeon! I have all the spares & will attempt the repair tomorrow.

thanks to you I repair my upper blades of my helicopter thank you.

Thank you very much for your video , its help me repair my helicopter due to that main shaft broken. Well done :-)

thank you! I've been trying to figure out for hours why mine just crashes!

It flies well. the gears aren't worn... I might have to check the forum. It could slightly bent shaft. I also think sometimes in flight, it can be a bit unstable. Oh, i joined the forum.

You couldn't find a more confusing tablecloth? Where is this a pizzeria?? .. I kid great vid 😁

I'll bet he just loves chasing the syma all around the room!.

The only thing I can think of is the bottom gear may be broken, have a look at the gear box. Have a look on our forum there are some issues there that may help you with this. syma107 forum.

XxNardoxX1, I suggest you check the wires to the motor there could be a broken one.

Brilliant video,problem and repair really professionally explained and filmed-Thank you Topvideos1001

thanks this repair guide resolves my problem!!! Thanks a lot!

Well i joined the forum, and i tried fixing it my self. It flies well and the gears aren'

Great video. Thanks for posting.

It's very useful! Thank you.

thanks dude it helped me a lot. i broke my small bro's RC helicop. and u helped me else my dad would have killed me

Fixed my copter thanks to your video. Was the exactly the problem I had. Now if I could get some battery’s from Amazon that were worth an $&@?!!! Lol. Stay safe Stay Well!!! Thank you.

Thank you sir... very helpful video and it help me accomplish exactly what I needed to fix.

I have subscribed to your channel, thank you for your comment, Love you to. Oh and A big happy New Year to everybody !!!!

thanks just had to tighten and fixed thanks

@adrian747 Glad to help you, my pleasure.

Please check out more of my Syma videos here - kzfaq.info/get/bejne/jrhpfLCc0sDac6s.html

Perfect! Done!

Very useful video well done,this web site I marked for future needs

Thanks you helped me fix this a Cupl of years ago

Can you provide me the link to the ready made part without the shaft. I don't want to take the whole heli apart. Great video! Very helpful.

It could be the gears are slipping, have a close look at the gearbox, I have done a gearbox video on gear slip. hope this helps.

Glad to be able to help you :-)

@Topvideos1001 I did change the top blades so ill switching them back to see if that's causing the problem. I didn't touch the gears at all.

yeah. then i fixed it. exactly what was broken like in the video. but it still does smalll circles and isnt fun to fly anymore.

My pleasure Sir, glad to help :-)

To be honest it could be a slightly bent shaft, or a balance problem, try swopping the top blades around. Did you remove the gears?

@Topvideos1001 hi i followed your tutorial but the heli is making a clicking sound. when i throttle the main blades lifts up and it makes contacts with the plastic right aboyve it which holds the stabalizer.

thanks man ...really helped a lot

Try adjusting the trim on the Transmitter.

This was a great help Thank you!

Thanks, this is really helpful..I wonder why my heli keeps sway and fly in a circle..now I know what the problem is

Great video. One problem. My balance bar is secured using an eyebolt. There are no threads and it slides out very easily. How to I get it to stay secure?

I have a syma s107 (not the g version) that has a wobbly shaft.

I was looking for instructions on how to remove the gear from the main shaft. Is it pressed or threaded? I did learn about the upper assembly though. Thanks.

Check my other videos here syma107.com

thanks a lot helps me

I thought you were going to explain how to do a diy fix rather than just replace the part. haha I'm going to replace the two lobes, I'll need my magnifying headband type thing as it makes it far easier.

Is it bent, very slightly or have the gears worn ? Try asking on our Forum we have some very helpful chaps there.

I was wondering if there is any information on the forum about how to remove and replace a main blade grip on a Syma S113G? Thank you for your time.

THANK U THANK U TNX UUUUUU, GOD BLESS YOU!!!

I am glad to help you all, Thanks for the comments I will do more vids very soon.

great video thanks

Hey, my helicopter has broke and your video tells me how to fix it, but i don't have the right part and i was wondering if you could tell me where to get that part? Any ideas?

Love the videos, very helpful, but having an issue with my top rotor and weight. No apparent damage, but the blade and weight wobble, which make the heli wobble as well. Straightened weight shaft but will not keep level to ground and crashes. Simply replace whole top rotor and weight assembly? Seems like it is out of balance some how.

THANKS SOOO MUCH!!!!

Thank you. It helped

This was very helpful but can i know if the main shaft of this helicopter be used in my Skytech M12 rc helicopter.

Try Amazon, or R,C Fever. hope this helps.

OK, sorry, I missed your comment, but glad you are sorted :-)

Thank you for your kind comment, it did make me laugh, the bit about crappy music, you are right there are loads out there that cant explain important things easily :-) multibladehelicopters com

My pleasure sir :-)

Not bad after only one take ;-)

I have the same helicopter I brought it today and somehow being a amateur the heli has broken I'm trying to put it right the bottom wings stopped working I had a look and the top wings comes out and the metal in the middle comes out fully so any ideas how to fix it ??

Plz, make a video hw to pepair back one to rotate