They are easy to take apart, but I have one that the accelerator pump will not work. I took it apart and found that the check valve seat was severely disfigured. This is located right next to the accel. pump. The accel. pump pushes fuel to a tower right next to it, this tower has a brass weight with a fine taper on it and acts as a check valve. If the seat is trashed, the carb is trashed. It is pressed into the housing and has a hole that is only a couple of thousanths. I see no way to remove it or even find a replacement seat.
You may be lucky and have just a torn/worn seal on the accel. pump plunger which is an easy fix. If it's trashed, go to a Weber or buy a rebuilt Hitachi (what I did) Advance Auto Parts sells them for around $300. It hurts the wallet, but worth every penny when you turn the key!