I'm lost on our terminology, mostly probably because of my lack of knowledge on this vintage..
I'm in the middle of a Scheb for '25 Prince, but it is a regular "H" model, as best I can tell from the literature that I have.
The quotes you posted apply to later DLX models. The H doesn't even have a venturi!
(It looks like toilet plumbing.)
I'll have to get out my book (pitiful little pamphlet) and see what the DL40 part number refers to.
Please post me direct (firstname.lastname@example.org
) with your motor model, photos, or anything else that would give me a clue, and then we can make a foolish guess.