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@jfranklyn Explain a bit more of the problem so can work out what it might be
If balance bar damaged sounds like a bad crash,check all rotor screws tight then look at main shaft to see if bent-keep us posted
Had a similar problem myself. Check out the main shaft where it connects to the top rotors. there is a pin on the assembly that inserts into the plastic clip that holds the rotors. On my bird, that pin was broken, and therefore caused the top rotor to shake with throttle. Repaired temporarily with loctite glue but it snapped again. Had to order a new shaft.... but i have more choppers
Buzzsaw, you got it! It was not the main shaft that was bent but the pins on the plastic connector piece that locate the upper blades to the shaft had broken. The connect buckles were the only thing holding the upper blades in place and you can only really determine this by taking apart the upper blade assembly.
After replacing with new parts that just arrived from China the chopper flies but was a little wobbly while hovering. After replacing the balance bar it flies "almost" like new.
Congrats on the fix!!
On another note, while waiting for my parts to arrive, I drilled a tiny hole through either side of the shaft where the pins were, and glued new pins in the holes. Flys so good I may not even use the replacement parts... yet. Note to all, if unlucky enough to have to do this, use a straightened paperclip to simulate the main shaft when gluing pins in to allow for correct spacing and to assure a good fit. Happy Flying!
Yeppers.... this is a definite weak spot. Sheared off one of the pins this morning with a rotor strike, the bird stayed in the air but started dancing all around... first inspection it's hard to tell anything is broke. I'm in the middle of removing the pin right now, hopefully the pin from the grounded knockoff I have will fit. If not, going to have to retrofit something!
Ok.... repair is done. I found that the "pin" isn't exactly what I though it was going to be.... it's more like two round tabs. The knockoff's top rotor plate assembly was in good shape, I swapped them out. At first it seemed that the rotor shaft was thinner but after a closer inspection I noticed that the genuine Syma has an additional sleeve around the shaft. Removing this allowed the knockoff's top rotor mount to fit. I found the flybar connector was a bit wide to accommodate the original flybar (flybar fit really snug, not free-moving) so I used a razor blade and shaved a small bit off each end. With all that, the heli is back in the air and flying great!
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