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My guess is your motor is getting hot and the hall sensors are shutting down. Then they start working again when they have cooled down. At that kind of power you should really be monitoring your motor temperature.

It looks to me that someone has tried to fit the wrong gear set to it. Can you post a photo of the engraving on the motor cover?

I fix them using hot glue and test, so I can easily move them if they need to be adjusted. I don’t bother with the sticky pads that are supplied anymore. Then when I’m happy with the position I peel off the hot glue and clean up with a bit of alcohol, then use high strength glue for a...

I used to have an upright bike rack mounted on the wall in my garage. Not sure if the OP is trying to do this or mount it on their car. If it’s in the garage then a hoist would be useful. If on the back of a car then that’s more problematic.

My KT controller has L settings. It’s L1 where you can set the under voltage value to be manual or automatic.

If you disconnect the battery and then switch on the display power button the capacitors in the controller will discharge and you should be good to go. The display should come on for a few seconds while the capacitors are discharging and then it should go blank. I always do this when I’m doing...

There are different styles on eBay. Some have leds going around in a circle so you can visualise the phases inside a motor and some have LEDs in a straight line. Maybe worth getting a box of these as well so you can make up some more test leads...

Somebody already makes these in China for £8.30, but a multimeter does the job just as well without any confusing leds...

If the mosfet test fails then you will need a new controller. It is possible to replace the mosfets, but I don’t think that is something you could do. And there is no guarantee that will fix the problem because other more delicate components in the controller could also be damaged. If the...

Mosfets have two modes of failure, they can go either open circuit or short circuit. A typical failure in a motor controller is a mosfet going short circuit and the simple test that Neal linked to will tell you that in just a few minutes. We see a lot of people on this forum replace parts...

ike = bike. It would be useful if you can post a photo of the label on the controller. If you do decide to replace the controller it would be easier if you could get exactly the same, otherwise you may need to do some rewiring, which isn’t easy when you have to run wires through the frame.

You could try that if you don‘t have the ability to test the controller properly. But you still could end up having the same problem. And create even more if you buy the wrong controller/display combination. If you have a multimeter and know how to use it, you can do some simple tests to...

Have you examined all of the connectors to make sure the pins are in good condition? I use a magnifying glass for this.

That one is going to the display.

It’s worth disconnecting all of the connectors for a visual inspection to examine the pins. It is not uncommon for the JST connectors to have a bad connection. Sometimes just unplugging and plugging back in again fixes the problem. I’m not a fan of using silicon sealant on those connectors...

Yes, yellow, green and blue large wires are the motor phase wires. The small wires going into the black connector are: Red = 5 volts Black = 0 volts Blue, Yellow, Green = hall sensor outputs from motor White = Speed or Temperature sensor output from motor

Yes you can do that. There is a mechanical switch under the cover.

They can either be 2 or 3 wires. There is probably already a connector somewhere, it’s just that you haven’t found it yet.

They won’t disconnect from the top. There may be a cable connector lower down the cable going into the controller. If you are unlucky, the brake switches will be hard wired into the controller, making it even more difficult to fault find.

Now that you have removed your controller you can open it up and do a mosfet test. Checking for short circuits is easy and with a little bit of YouTube research you can do an open circuit test as well. That will either confirm or eliminate them. And you can also do a continuity test on your...