Hi Mate,
I think its a case of trying all the usual fault finding... trying new sensor wire, putting old sensor wire and motor on new speedo etc... The only other thing it could be is something wrong with the sensor board on the motor (I think they're called 'hall sensors' or somesuch). I know some of the newer motors you can get new sensors for them, the old motors just end up as scrap when this happens..
Have you been landing any big jumps to 'flat' lately? That amount of shock has killed a couple of mine in the past...
Good luck...
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