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Old 2018.12.23, 12:36 PM   #1
Kacordy
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MR-03ís, motors donít run?

So I have 2 new MR-03ís and the motors donít run. Took one out of the box, bound it, and only the steering works. 100% no motor response. 2nd car ran two full battery cycles on the track. Installed new batteries, car has steering, motor will not run. What is the best way to trouble shoot and get these cars running.
Thank you for some suggestions to fix.
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Old 2018.12.23, 12:51 PM   #2
TPDazzle
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Make sure the motor wires are screwed down to the board. It is a simple thing but a loose screw caused my car to have the same symptoms once.
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Old 2018.12.23, 12:55 PM   #3
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Can you easily turn them by hand, if you rotate the spur gear with your fingers? I would double-check gear mesh that it's not too tight, and also check the screws that hold the motor wires to the board.
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Old 2018.12.23, 02:31 PM   #4
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the yellow square cap on the motor is essentially a breaker. usually they can be reset buy turning off and on, but if they are defective maybe that is your issue.

try removing one and see if that solves your problem.
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Old 2018.12.23, 02:32 PM   #5
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If you can solder, I would remove the fuse on the motors.
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Old 2018.12.23, 04:15 PM   #6
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Perfect, I will try the above. Yes, I can solder. Thanks guys
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Old 2018.12.23, 09:25 PM   #7
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I found the black wire where it screws to the board broken at the factory solder joint. It’s now fixed and running. The 4th new car still does not run even after I disconnected the yellow square cap.
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Old 2018.12.23, 09:41 PM   #8
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Pull the motor wires fron the screw terminals and connect them to a single AAA (hold the black wire to the negative tab and touch the red to positive. If the motor spins, then warranty the car with kyosho. If the motor does not spin, contact kyosho and see if they can send you a replacement motor. Kyosho is usually very good about warranty replacement.

The stock motor wires are quite stiff which puts strain on the solder joints. I almost always replace them with more flexible wire and hard wire to the PCB. I am always a little nervous about a motor terminal screw coming loose... I would test thoroughly before soldering to the pads on the board, but the solder is a much more secure connection than solder and a screw terminal.
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Old 2019.01.06, 05:18 PM   #9
ZacMaster
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Quote:
Originally Posted by EMU View Post
The stock motor wires are quite stiff which puts strain on the solder joints. I almost always replace them with more flexible wire and hard wire to the PCB.
What is everyone using for more flexible wire?
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Old 2019.01.06, 05:23 PM   #10
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Turnigy makes some good stuff in various gauges.
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