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Are you pumping the primer bulb until firm befoer trying to start it?
Whats the engine doing, not starting?
How are you determining that the engine is getting no gas? What exactly do you mean by that?
Was a compression test done on the engine yet?
When was the last time it started? And what has changed between then and now?
Is the saftey lanyard in place? The kill switch clip?
Well it takes 3 things for the engine to run. Compression, spark and fuel.
You state you have compression.
You say you have spark.
So that means your missing fuel. You also said the carbs were clean, but they are obviously not as clean as you think they are. If you had clean carbs then you would have fuel, and the engine would run.
It really sounds to me like those carbs are boogered up. And need to come off for a proper cleaning/rebuild.