on a 1968 Johnson 20hp there is a lean - rich mixture knob. beneath the
knob's limits (9 back to 3 o'clock) there is an awful lot of room for
adjustment. I'd like to set this motor back to what the factory would have
set it to, but I have no way of knowing what that is.

I'd say from where it is positioned now to remove it more than 15 turns
could be done. I didn't check how many more turns to put it all the way in
though.

thanks to anyone who may have the correct settings (how many turns out I
assume for original settings).