I had problems leaving my bike standing for a while and the simplest and best fix without messing with the carbs is to replace the fuel tap. When I did that my bike starts 1st or 2nd kick.
Alternatively you can spend plenty of time setting the float heights and replacing the float valves and seats
If the seals are gone because you don't run it enough, the bike won't run properly once you've started it.
The thing is, if the fuel leaks down through the fuel tap and then through the carbs, there will be plenty of petrol working it's way down through the lower cylinder and eventually into the exhausts. I had a pint or so of fuel jet out of my bike after leaving it standing too long. so I reckon the seals won't dry out as long as there's plenty of fuel in the tank
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