I picked up a VW starter from a local autoelectric guy that looks good.
Attachment:
Starter 001.JPG
Attachment:
Starter 002.JPG
Attachment:
Starter 003.JPG
It's 7.4 lb, CCW rotation, ~9/16" gear stick out travel, 1 HP, 9 tooth.
Used on Jetta 01-06, Beatle 98-04, Golf 00-06, auto transmission only. ( That's what I was told)
I don't know what the gear specs are (pitch diam etc.) but when I find out I'll post here.
I foolishly thought that if I knew the starter RPM I could calculate the diameter of the ring gear I need for a reasonable reverse speed. I forgot that DC motor speed is dependent on load. With no load, the starter spins at 3800 rpm. So it's going to be trial and error. I'll start with a diameter of ring gear approximately the same as my drive sprocket and see how that works.