I was also messing with a Martin 75 Twist shift.
More out of curiosity to learn about new things
that got me to start on this motor as I don’t really
find it visually appealing. I got it in a "take one –
take them all" deal. The motor was beat up with
damaged and missing parts. twostroke was a
big help in getting some of the missing parts I
needed and with the advice from members it runs
again. Here are some pictures.

I really don’t find the motor much to look at.
Its not as nice as the Mark-7.
I had some paint to use up.
https://www.youtube.com/watch?v=sXUCsDbh9Wk