
I bought 4 of these motors in December 2019. This is one of the worst engines I have ever bought. Unfortunately, by the time I started working with them and found out how the motors behaved, my return period had expired. So what's wrong with motors: 1. Motors won't work unless you give them a PWM greater than 250.2. Above means you can't if you want to slow down 1 motor. It will stop.3. Sometimes without change, the motor polarity will be reversed automatically. Instead of moving forward, the motor moves backward.

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