OK all you "carb-sharks" out there! Someone tell me just what kind of bizarre setup I've got here.

According to the number stamped on the bowl casting, this is a model 2100S carb.

On the 1st pic, I have circled what looks like a vent shaft on the side of the carb. Notice the top casting does not cover the top of the vent.

The 2nd pic is a close up of the top of the vent.

The 3rd pic is a close up of the bottom casting where the vent shaft ends up, against solid cast iron. !

What is the purpose of this vent? Has someone put the wrong top and bottom casting on this? Is it OK to run as is? Does someone have an exploded view/schematic of this model carb they would be willing to e-mail, post, snail-mail or whatever?

Thanks guys (and gals! wink )

[img]http://f2.pg.photos.yahoo.com/ph/sbn2263/detail?.dir=/5240&.dnm=74a5.jpg[/img]

[img]http://f2.pg.photos.yahoo.com/ph/sbn2263/detail?.dir=/5240&.dnm=2bbe.jpg[/img]

[img]http://f2.pg.photos.yahoo.com/ph/sbn2263/detail?.dir=/5240&.dnm=cf94.jpg[/img]