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We tried moving the motor from the left side of the cart to the right side (and flipping the axel too) So that the forwards direction of the motor is now the reverse. Essentially to test if its a problem in one direction with the motor. The problem remains! Jerky forwards at low speed, reverse...

Thanks RedFlash - the gear ratio is 100 to 11. I would have liked smaller wheels, they are 20cm radius. The thing that is surprising for me is that in reverse everything is totally smooth. So it seems like there is enough power. Also in forwards direction if you give it a lot of "gas" right...

Thanks guys. EpsilonZero here's Specs I can find: Motor: From label:"ZY1020GD", 48 volt, 1000 watt, Input current 20.8A Battery: 48 volt, Rated for 30A continuous Controller: 48 volt, 1000 watt, (it came in a kit with the motor (yi-yun.com ?) I don't have much more info on it...

Hey there - I've been enjoying the forums. Doing a build with my kids and stuck on something: * Motor jerks or stutters at lowest speeds going forwards. * In reverse, all is smooth. * If I lift the wheels in the air, all is smooth forwards and backwards. Short video of problem: I'm not sure...