First thing to do is try a strike with a rubber hammer, to unstick the valves/float.
It could be the needle valves sticking, or the float itself could be stuck in the chamber and not able to rise. It is fairly easy to get to - undo the main fuel feed banjos, then the three top bolts on each carb, and take the lids off the carbs. The needle valve is screwed into the lid, and you'll see the float chamber in the body. You can then see whether the float itself is stuck. To remove the float you first have to pull out the hinge pin and lever ( which rides up and down on the float top ).
Parts are fairly easy to get as Solex carbs were used on many other vehicles - I got some needle valves from Eurocarb Ltd. who also do jets. The 405 uses the 1.5 ( 150 ) size and it is most likely the same for your engine - this should be marked on your needle valves. If you do replace them, you should match the height at which the valve closes, using the washers under it. This sets the float chamber fuel level.
If you are a BODA member, I would recommend getting the Pegasus Parts set of washers for the main fuel feed banjos. They solve leaks there without having to tighten the bolt too much - this thread in the carb lid is not strong.
For the first start in a while it is always good to use the hand priming lever on the pump as this shows up whether all is well. You can hear the carbs fill up and then the lever should suddenly have no resistance once all three valves are closed properly.
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