So, I was taking apart my carburetor ('78 50V, stock Gurtner carb) to clean it, when I noticed something odd about this throttle piece:
The throttle cable lowers/raises this piece inside a cylindrical chamber, and that meters the flow of air. The odd thing was that this piece seems like it should definitely face a particular way, since one side has a wedge-shaped cutout, but it was free to spin inside the chamber. The chamber has a keyway down one side, as if to prevent this piece from spinning around in there, but nothing on this piece goes in the keyway. Part of the top of this piece looks chipped off-- was there a nub here that fit in the keyway? If not, what mechanism keeps this thing in the right orientation?
Then, I started taking out a brass screw on the bottom. That fell out, revealing a threaded brass collar. I took that out, and there was another, smaller brass thing under that... but when I tried to unscrew that, I stripped the slot right off of it. I think it was my main jet, or it holds it in. So much for getting it out... should I just put the other brass pieces back in? Or will it not work now that its surface is, err, "modified". Should I just get a Dellorto carb?
If you read all that, thanks! If you know anything about these carbs, I'd love to hear it.