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1. Is there a service manual/workshop manual for the Mark 2 Midget engine? (I have the ops manual and parts list thanks to Jack's postings)
Hello Cylon
There is a service manual, but I have never seen one
for sale in Australia. The manual's focus was on the motor-
cycle variant: - see gallery below.

I have never come across a service manual for the mower itself.

I can't help with question 3 about sprocket configuration.
I don't even have a chaincase image.

I can't help with question 4 either. My best guess is -
in the absence of a nut (or key-way) that this is a LH thread.

Maybe a member will have some answers.

Hope this helps.
Jack

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midget_02.jpg (68.64 KB, 178 downloads)