The carb on the Beta 4T seems to sprout tubes in all directions. Does anyone know what they do, what they should be connected to, and how long they should be?

The one marked in yellow is fuel-in. That's the easy bit.

The one marked blue is a large diameter tube that communicates with the underside of the diaphragm. In my case there is a plastic cap on it, but is that right?

The green one has a short 2-3 inch tube that points downward. Possibly the float chamber breather?

The red one on the left has a very short tube. The red one on the right has a long tube which is blocked off, so seems pretty pointless. They look as if they are possibly intended to connect together in a loop from left to right, but if so, why?

the green  and two red are breather/overflow pipes and would normally be joined...into a tee piece then a single pipe running down toward the bottom of the shock. The top blue should be capped off....this is used to balance the carb in a multi carb set up

This is my carb

That's very helpful. Probably explains why mine dribbles petrol, and leaves a persistent smell in the garage and car . I'll try to get those changed before putting the carb back on.

I copied thall1's pipe layout and it worked well. Absolute swine to find a place to route everything though, without cooking something on the exhaust.