Manx TT- No Motion.

Similarly as in the Scud Racer an optical encoder is attached to the motor in Manx TT. This encoder needs to be carefully adjusted for it's home position (when the bike is in the middle). Whenever the motor is disengaged from the gear this adjustment is completely lost and the encoder must be readjusted. The encoder wheel is under the black plastic cap on the top of the motor. The wheel is secured with a small grub screw which has to be loosen up to make this adjustment. Note that there are three opto sensors - two for reading the perforation of the encoder wheel and the third one hidden under the encoder wheel for detecting the home position. Adjust the wheel so that the little arm is triggering the home opto when the bike is in the middle. In some machines "rubber spring blocks" returning the bike in the middle position may be worn out. This may cause the bike not returning properly to the center every time and make the adjustment of the encoder home position difficult. Sometimes it may be necessary to adjust the encoder wheel slightly off the home position opto. Make sure that the encoder wheel is not physically touching any of the opto sensors while spinning. 

DO NOT CARRY OUT THIS ADJUSTMENT IF YOU HAVE NEVER DONE A SIMILAR ADJUSTMENT BEFORE. IT IS EASY TO DAMAGE THE ENCODER.

This is certainly not something you want to rush to do. There may be other reasons why the motor is not working and they should be investigated first.