If we go with the theory that the carbs are not priming up and if the carb bowls were filled up by some act of God, and then the bike would run--- then here is what I would try.
Wal-Mart sells a glorified tool that works like a hypodermic needle. It is made to suck and measure two cycle oil out of a container to mix with gasoline. People buy them to mix small quantities of gas for those tiny weed eater engines. I usually only mix a quart at a time,and this tool works great for that purpose. So what you have is a small vacuum sucker to help fill your carb bowls. Use the tool to inject the gas through the open bowl drain screws,and then tighten them closed after you fill them from the bottom drain, using a piece of fuel line connected to the "needle"
Then with full bowls,hopefully the bike will fire up. I do not have an answer as to how you will know how much gas is just enough without overfilling the bowls,but once you know that answer,the tool has graduated measurements built in for easy repeatability of results.
The tool should be safe to use with gas, but there are no guarantees. Be careful of fuel spilled on the bike while filling the bowls, and use some sense before you try to fire it up. We do not want you to catch yourself,the bike,or the garage on fire!!
