diaphragm

Why is there a difference in the height of the stop located on what would be the bottom of the fuel pump diaphragm? I recently replaced mine when I put the quick shot cover on as per the directions. And the replacement the local shop had a significantly longer stop than the stock Husaberg...

Hi, Is it possible to use a diaphragm accelerator pump on a dirt bike? I have only seen piston-type accelerator pumps. Since it seems to be good for the functionality for a big four-stroke, why isn't it used with the Dell"otro carb?