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Thanks, I'm a lot better now. I managed a 35 mile bike ride the other day. I'm OK as long as I don't pedal too hard. Fitbit is handy for monitoring heart to make sure I don't overdo it. It was weird - one day I was OK and the next day I couldn't walk 10ft. I thought I had the Chinese plague, so...

Your photo isn't very clear, but it looks like all you need to do is replace your jack-shaft axle with a hub-motor, as long as you have enough clearance for the outside diameter. Then you can chuck the old motor or use both. The sprocket on the left side is screwed to the motor using the 6...

You should have asked first. Did you ask the supplier about the manual for the LCD?

The wires need to match from one side of the connection to the other. Are you sure that the throttle signal wire is green on your 5-wire connector? I would have guessed the white one. You can test by connecting just the red and black, then measure to see which of the others has 1.2v on it that...

Have a look at this. It uses a large geared hub-motor on drop-outs in front of the differential axle. It has normal derailleur gears to the motor so you can always get a comfortable pedal speed. There is a sprocket mounted on the disc side using the disc brake fittings and a separate chain from...

Why did you post a link to one with red blue and yellow, then?

You have to connect red to red, black to yellow and whatever third colour wire you have to blue.

He just ranted on about covid precautions, which he thought were over the top. Personally, I didn't find it irrational apart from the very end, where he explained disadvantages of wearing a mask, based on what I believe to be false information floating around the internet. Just for anybody...

Motorbike chains are completely different. They have their own lube sealed in for life with O-rings, and there's no derailleur to get gummed up.

Did you connect yellow to ground as explained here in picture 4...

That's easy because you can take it apart from either side. Take off every nut and washer. photograph them before separating so you can put them back in the drop-outs the same way. There's no need to take the gears off unless there is a nut inside that you can't get at. Remove the 6 screws on...

Yes, cut the connectors off and solder the wires together. Connectors are not needed.

A Bafang BPM or CST would sort you out, but ones labelled as 250w are very few and far between now. There's one here, but it's sensorless, which isn't really a problem with these motors, except you might need a new controller, and the photo doesn't show the important code number on the stamping...

Hypoid 90 gear oil. A bottle lasts forever. It's cheap, stays on the chain, doesn't drip and is extremely effective. There's no need to get ripped off by snake oil products. I did some testing over 60,000 miles on my commuter motorbike. The chain was the same all the time, as I had bought a...

Your logic seems flawed to me. You concept is to use the switch in the LCD to work another switch to operate the light. That requires extra wiring over what an independent switch would require so it's not minimal. You will still need to run cables from/to the switch/battery. The only difference...

This sort of thing was quite common 10 years ago when controllers were crappy, but Ib haven't heard it mentioned recently, apart from yours and guys running theirs sensorless for whatever reasons. Maybe it's just a crappy controller. After all, it is a very cheap kit. I always advise people to...

Have you thought about how you're going to fix any electrical issues when these bikes need it? Buying bikes cheap online might seem a good idea until they need fixing. You can't fix a Shimano system without the specialist equipment. There might be local dealers, but they will almost certainly...

There are three possibilities for your problem: Internal gears worn so they can't engage, clutch not engaging or the motor running backwards. If the motor turns the wheel forward, it's the clutch or gears that need replacing, which don't cost much and it's easy to do. You have to open the motor...

You measure between black and each of the thin green, blue and yellow wires while you rotate the wheel with everything switched on. You should see each of the three pulsing on and off with 5v. Stuff your probes up the back of the white connector on the controller side.

That's a sensored motor then. the only thing I can think of is that some controllers are dual mode and they'll switch to sensorless mode if they detect any problem with the hall sensors. If you have a meter, you can check that the hall sensors are working properly.