After not knowing I was missing a breather hose, I decided to upgrade from the masking tape that my mechanic installed. It was spitting oil EVERYWHERE.

Length - 36"
Diameter 1"

On sale @ $1.57 foot

About 8 minutes to fit, cut, and install.

I then found some high temp aquaium tubing in the garage (.5") and used it for the spit tank. I wrapped it in electrical tape, just because.

Does the spit cup need to be vented?

And I probably need clamps

Factory filler neck vented to air cleaner,, So Yes,

Was there any kind of oil separator on the factory setup?

Put hose clamps on both ends.

I think I see the issue. On mine, the pipe on the filler tube is the same size. The tank hose goes to the engine case, the one from the filler neck goes to the bottom of the aircleaner housing. Click to view attachment Click to view attachment