The Rotax comes with a banjo bolt & hose nipple style drain for the oil/foam effluent from the engine. The Book calls for it to be removed and replaced with a straight nipple instead. I didn’t make too much of a mess with the ~ pint of oil that was waiting to come out of the hole while I tried to change things. I also didn’t realize that I could re-use the yellow cap until most of the mess was already made. Lastly, I don’t have a deep 3/4” socket. I torqued it using my fish scale and known-length wrench.
Oh, by the way; this completes the chapter on engine installation. On to the accessories!
Straight Nipple oil discharge