What I noticed is the plunger is up in the coil. It should not be there if the motor unit is upright (it looks as if it is.) My guess is the plunger is stuck in the coil tube. The lever on bottom is to turn on or off the reversing mechanism. When on (you will hear a soft buzzing) the engine will cycle forward-neutral-reverse-neutral-forward. If the switch is off, the last cycle it was in it will stay that way. There is no center position on the switch lever, either left or right. You might put the motor assembly on the track and observe if the plunger and pawl are dropping down and grabbing the cog on the drum and shifting it to it's next position. Where it is at now in the picture, the unit is on.
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