Half of block not firing
Sometimes you can get lucky. Get a snorkel can of carb cleaner and try blowing it in after removing the idle screws. Sometimes it helps to remove screw and hold your finger over the hole while running. And blow air pressure through it
On an AFB, if you are careful, it isn't a really big job to remove carb top "on the engine." Remove metering rods/ pistons/ springs first
Do a Google search, there are online breakdown diagrams of these carbs and I believe there is also a "manual."