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[Edipo76]

hello everyone,
I took my zero fx to my trusted mechanic, who does thermal motorbikes, to have him change the sprocket and also the handlebars, because I had bent them. Now there's the problem that the bike, even without the pinion gear fitted, when you turn the throttle the engine doesn't go forward: it just vibrates slightly backwards and forwards but doesn't turn. Any idea what's wrong and how to solve it?
Thanks

[TheRan]

Was it the pulley on the motor, or the one on the rear wheel? If it was the motor one then care has to be taken not to damage the motor. At the end of the motor shaft on the opposite side to the pulley (underneath the cover with the Zero logo on it) there's a magnetic position sensor, my understanding is that if the pulley is forced onto the shaft in the wrong way this sensor can be damaged and then the motor won't be able to be driven.

[Edipo76]

hello, and how can you be sure that the problem is that? and how to solve it if it is? consider that we don't have any zero dealers in our city, nor in neighbouring cities
let me know, any advice can be invaluable
thanks

[TheRan]

I'm going assume it was the front sprocket (I've just realised you have an FX so probably have the chain kit, and the front sprocket is going to wear out sooner), I can't be sure it's definitely the encoder but from what I've heard with other people it seems likely. We can easily rule out there there's nothing physically jamming the motor if you can roll the bike around just fine.

If you take it to Zero then they're going to want you to buy a whole new motor. You can replace the encoder yourself and they're fairly cheap, but you then require a specialised cable and software to recalibrate it. Here's a video about doing so:

[Edipo76]

hi, but once the encoder has been replaced, is it possible to recalibrate it independently? because if you still have to go to Zero, who will then want to change your engine, there's little point in replacing the encoder yourself, right?
Can disconnecting the fuse for the engine and battery for 20 minutes help? I say at this stage, what if that could be causing the problem, or if it can be of any use after changing the encoder?
And if I had to change the engine, would it be enough to buy a new one and put it in place of the current one or is there anything else to do? If so, do you know where you can buy it online and at some cost? If I found it used, maybe it would be worth it but I don't know if that's possible.
Thanks so much for any help

[TheRan]

Once you've changed the encoder you will have to recalibrate it yourself, Zero likely won't touch it. You just need to hunt down the cable and software and pay like $600 for it (and figure out how to use it). You can also replace the motor yourself but in that case you need to do the same, the motor has to be linked to the controller. Here's another video on doing that:



I don't see pulling any fuses to be of any help. Once the contactor clicks after you key off the bike the battery is disconnected from everything else anyway. There could be other causes for your issue and things you can try but you'll have to wait for someone else to chime in with suggestions for that.

[rgutt]

I'd bet my right arm the mechanic damaged the encoder while replacing the pulley. Easy to replace, but like everyone else had said, you'd need the DVT software and a special cable to recalibrate the replacement encoder. There are several people on here who have them, but the with the newer cables, the software is keyed to a single computer. You'd have to find someone locally with the software.