Syma Forum

Greetings Mark, and welcome to the forum! Sorry it took so long to reply but alot

of weather-related issues here. Hopefully you find the answers you are looking for here

and please post often and have fun!

Let's see if we can figure this out:

   Blue 107 you said only the top-rotor works, what about the tail rotor? Possible

explanation can be gear-slip due to a hard crash or just wearing out. The motor itself may

still be running but the gears to spin the rotors are not meshing, therefore no

rotation. When you take it apart, make sure the white gears themselves are tight on the shaft,

some disagree with me here, but a drop of superglue on the BOTTOM of the lower gear

(which drives the lower props) can fix that.

   Red 107 you said essentially no power. My first thought after reading your entry is

to replace the internal battery. Yes it does need to be soldiered in and Amazon is probably

your best source. Since you stated you got this second-hand, it's likely the former owner didn't

follow the golden "15 minute rule" and the heli's battery is no good. Wait to fly 15 minutes after charging

and allow to cool 15 minutes after flights before recharging again. Also, what method are you using to

charge the heli? Plugging the USB end of the charging cable into a cell-phone wall adapter will work but

I don't recommend it. Best to plug into a dedicated port on a laptop, cable/satillite box or even a

video game system.

   Pairing lights being red and not green shouldn't have any effect, depends on what year or

PC board your 107s have. As long as your Tx makes the heli to SOMETHING, you're good

to go. Sometimes the color can change if you are trying to fly 2 helicopters at the same time,

perhaps with your son or a friend. The color can determine which channel on the Tx is being used.

   Once again, welcome! There are quite a few posts on here covering gear-slip and battery care.

Hopefully this helps!

                                                                                          All my best,

                                                                                             JamDJ