The primary leaks. I may have overtightened it. Whats the recommended torque spec for that.
The primary cover on the iron barrel bikes is held by one nut in the middle.
It is VERY important to not over-tighten that nut, because it might warp the cover and then it will never seal.
Remove the cover, clean the large o-ring that seals the circumference, and remove it for cleaning if necessary. Don't stretch it, or you'll need a new one.
Grease the whole o-ring with axle grease, and maybe put a little in the o-ring grooves too, and that acts as a sealant, believe it or not.
Tighten it up to about 10 foot pounds and see if that holds the oil, maybe 15 foot-pounds if you need to tighten it. That's that should do it.
If that doesn't do it, then you have a warped cover or a bad o-ring, or something like that.