Yamaha YDX Moro- sensor issue?

[Rocketscience66]

My wife's bike has started having issues - possibly with the sensor? I took off the back wheel to replace the Magura centrelock rotor (because it wouldn't stop squealing like a pig) and when I put a new one on we started having intermittent issues with the controller lights flashing on and off and the motor not kicking in.
The sensor is a really weird setup with this plastic ring that sits over the axle betwen frame and rotor lockring. I have noticed there is a 4-5mm space where the sensor ring can move in and out along the axle. My suspicion is that this is the problem. I put the magura rotor back on as it has a thicker lockring - which I thought maybe reduces the 4-5mm space, but we're still getting the same issue.
No idea who can be contacted in NZ as the only retailers of these are motorbike dealers - and they have stopped selling them now. Starting to wonder if this is why they sold it new for half the retail price?

Anyone else come across this problem? Are there any other Yamaha motor ebikes that use the same sensor system?

 

[Midlake Crisis]

I have had two issues with my Moro, the cassette lock ring stripped and loose, and thru axle working loose damaging freehub. since the sensor is part of that assembly I would take pains to be sure the teeth on the sensor are properly engaged into the hub, and the assembly is held in place but able to turn freely.

 

[Rocketscience66]

I have had two issues with my Moro, the cassette lock ring stripped and loose, and thru axle working loose damaging freehub. since the sensor is part of that assembly I would take pains to be sure the teeth on the sensor are properly engaged into the hub, and the assembly is held in place but able to turn freely.

Thx for that. After a couple of hours I managed to fix the issue. The problem was that the outer housing of the plastic sensor device was no longer holding inside where the centrelock rotor screws into the hub. The sensor wasn't rotating properly with the wheel. TBH it is an atrocious design flaw, esp since the magnet device inside is just sliding against the outer plastic housing! Ended up putting some teflon bearing grease in it to keep it from wearing.
The fix was to place a rubber ring around the sensor bracket so that it pushes inside the centrelock/hub outer to hold it in place. I'm not left with much confidence about the long term reliability of this bike.

 

[Midlake Crisis]

Thx for that. After a couple of hours I managed to fix the issue. The problem was that the outer housing of the plastic sensor device was no longer holding inside where the centrelock rotor screws into the hub. The sensor wasn't rotating properly with the wheel. TBH it is an atrocious design flaw, esp since the magnet device inside is just sliding against the outer plastic housing! Ended up putting some teflon bearing grease in it to keep it from wearing.
The fix was to place a rubber ring around the sensor bracket so that it pushes inside the centrelock/hub outer to hold it in place. I'm not left with much confidence about the long term reliability of this bike.

I truly love the bike but from reading it seems like regular bolt checks on all major components is very important to avoid problems.
Another common issue is battery connector rattling loose causing intermittent issues, can be prevented by shimming it with a wide rubber band.

 

[Rocketscience66]

I truly love the bike but from reading it seems like regular bolt checks on all major components is very important to avoid problems.
Another common issue is battery connector rattling loose causing intermittent issues, can be prevented by shimming it with a wide rubber band.

Thankfully I don't ride this bike ... and it was very cheap as Yamaha were pulling out of the NZ e-bike market. Prob should have just paid more and got my wife a reliable Trek Rail.