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Jeez, thats £400 more than what I paid for one of these, which is very comfortable, has an electric screen, traction control, can carry a trolly load of shopping and go up any hill without breaking a sweat. It probably has lower running costs too.

You can get more power more easily if you take a couple of springs out of the chainwheel. Here's what it looks like and an explanation of how the torque sensor works. https://www.pedelecs.co.uk/forum/threads/carrera-crossfire-vulcan-torque-sensor.30490/

I'm not sure what you're saying, but if you have a three wire brake connector and you want to connect a 2-wire brake, it should be connected to the signal and ground wires, not the red 5v. The brake signal wire is connected to the controller's CPU. It's held at 5v by a pull-up resistor, and the...

Try the other way round then. Maybe the fall damaged the torque sensor. Disconnect it and see if the bike works with the throttle. Unless it's a brushed motor, the only way the controller can give power to rotate the motor is by a signal from a sensor. The controller CPU normally checks all the...

If he's Polish rather than East German, it's Andrew, the guy in my photo, who I know. If I remember, I'll phone him tomorrow and find out what diffs he uses.

I think that you might have damaged the throttle cable from the fall. Follow the cable from the throttle until you come to a connector. Disconnect it and see if your regenerative braking and torque sensor works again. If everything works except the throttle, then you know it's the throttle. You...

I think you might have figured it out correctly, but I have some reservations. If it's an analogue one, the green wire gives an analogue signal to the controller for the PAS speed. For a three level one, it would be something like 1v =level 1, 2v = level 2, 3v =level 3 and 4v = 4mph. I've never...

That's it above. You need a couple of washers or some sort of spacer on the axle between the motor and the drop-out. Arrange the spacers so that the caliper is in the middle of its sideways adjustment. That will make the motor even wider and the frame will have to be stretched further, but...

If I take everything you said at face value, my logic says that the motor connector became dislodged in the downhill ride so that there was a partial disconnection. When she started to pedal again, the motor controller gave it's power, but couldn't rotate the motor because of the incomplete...

Can we have some more information about how the bike suddenly working? Were you going up a hill, stopped at traffic lights, went over a big bump or what?

Yes, just pull or lever the forks apart to get the motor in. All bikes have the same 135 mm wide rear forks. Its a standard. There are some exceptions, but those are mainly unsuitable for motors. The amount of force you need to put the motor in depends on the construction and stiffness of the...

Before buying a new one, you need o determine where the fault is because these devices often indicate a fault elsewhere. Their main function is as a switch to power the motor controller. The bike will work without the control panel if you make the connecion yourself. To do this, you follow the...

OK, thanks, that makes sense now. Cassette motors are about 10mm wider than the frame, so you have to spring it in. You might need a big screwdriver or something like that to help lever the motor in. Another thing you can do is get a piece of 10mm threaded rod, a couple of nuts and a couple...

Can you show us what you've got? Is it a front motor kit? What is "it" that's too narrow, the motor or the fork?

It's not an s866. You better show us what it is.

You can get cheap batteries on German Ebay. Search for Panasonic Akku

That doesn't explain how it happened. Did it start misfiring when you were riding, just go dead in the middle of a ride or what?

The 406 is important, but you can choose the width. Anything from 30 upwards would be OK. The bigger, the more comfortable. You don't need to take the wheel off to fix a puncture. That's what you do when there's no motor in the wheel. For a motor wheel. turn the bike upside down, pull the tyre...

If you get excessive resistance when you push the wheel backwards, there's a short between the motor phase wires. That can happen after an accident or bad handling damages the motor cable or when a mosfet in the controller blows. These things never happen by themselves, so tell us the...

No, it's a mystery. Normally, you'd get them after an operation or injury, but I didn't have anything like that. Doctors aren't like engineers. When engineers see a problem, they solve it by finding the cause. Doctors solve by treating the symptoms.