Why wont my Yamaha 350 Motorcycle Take Off?

I have a 1973 Yamaha 350 2 stroke motorcycle and it will run and idle fine i can even rev it up while it is IDILING. When I put it in gear and let out on the clutch, it dies. And yes i do know that i have to give it some throttle when i let out on the clutch. It did set in storage for a little over a year and i had to clean 1 of the carbs. The hose that connects to each side of the gas tank and leads to the other side of the tank is gone but i plugged up the holes (could this be my problem)? I'm also wondering if the transmission isn't slightly frozen up.
 
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