The left front motor wouldn’t turn at all yet spun easily when spum my hand. Anyway it time for new motors. When ever I change motors for the 1st time I will replace all 4 of them after all they all have the same amount of time on them so it just makes sense to start with 4 new motors.
Small Phillips screwdriver
I started by removing all the screws from the bottom of the X5C-1 and there are a bunch of them. 5 in each arm, 4 in the center of the body in the landing skid holes, and 2 under the battery door. Remove the props taking care not to loose the screws as they are a different size than what holds the body together. Then the top will just pop off you may have to squeeze the arms some as they have little tabs holding the 2 halves together.
The motors I purchased off Amazon were direct replacements having the same color wires as the original motors. The only difference is the replacements had brass pinion gears whereas the original motors had plastic pinions. Will make it a little nosier but that’s probably the only downside to the brass pinions. I replace one motor at a time that way there is less chance of getting the wiring confused.
Tin the wire tips on the new motors. Heat the solder joint of the FCB and gently pull the wire as the solder melts the wire will come loose. Do this for both wires, now you can remove the motor. Replace with the new motor and solder the wires ends to the FCB, Lay the wire on the solder point on the FCB and touch the soldering iron to it within a second or so the joint will melt capturing the wire, quickly remove the soldering iron. Repeat for the second wire. You are now a 1/4 the way done. Follow the same procedure for the other 3 motors.
Tuck the wires nicely into the body so you don’t pinch them putting the body back together. Line up the top and bottom half and snap it back together. Replace the screws, the body screw are all the same size so that makes it easier. When all the body screws are back in and tightened. Remember you are dealing with plastic so just snug the screws don’t over tighten them. Replace the blades make sure you get them in their proper locations. On the bottom of the arms out by the motors there is a little symbol showing which was the blade for that are turns.
As a rule of thumb the front blades will spin going into X looking from the top. The same for the rear. So that will be the direction you want the leading edge going. The leading edge will be the thicker side as a general rule, think of the blades as 2 wings mounted on a hub. You’ll get the idea.
Now your ready to break-in the new motors.