W/r/t "the float bowl (which carries the identifying marking of the YF model) can be swapped with throttle bodies and air horns of any model YF handy. This creates a mongrel carburetor which will never ever work as it was designed"
I agree.
Not speaking directly of that vendor (don't know them) but this problem exists throughout the industry. Many unsuitable variants can be made from interchangeable parts, whether innocently ("they came in the same box, so they must be from the same and correct carburetor") or deviously ("It's all I have left, and it's not going to anyone I know").
I write about the Linkert Model M (side-draft 1 bbl. for Harley-Davidson and Indian motorcycles) and some weird mix-n-match bodges have caused much grief over the years because of this.
