Newly acquired 1985 FXWG with Evo engine and 4 speed, belt drive rear wheel.
Please correct me if I'm wrong. This is how I believe this works.
The primary (wet) breaths through the hollow tranny shaft where the clutch push rod goes through. Then both primary and tranny vent through a small hole in the top at the back of the tranny. Is this how it works?
Depends on how it is plumbed.
I usually seal the primary and use the oil feed fitting as a vent.
Not sure no vent is good, and to count on it venting via the clutch pushrod seems chancey
You have a Service manual ?, it will show you , or ask FSG to send you the diagram for a straight answer