If your not a fan of gas in your mouth.......
You can blow on your air vent which is up by the handlebars to push the gas from the tank into the carb.
When you blow, keep your finger on the end of the hose to keep air pressure pushing the gas.
It also would help to have an in-line filter just before the carb to filter dirt out after you clean the carb and also to watch the fuel enter the carb as you blow in the air vent.
My Trikes: Past and Present
1985 Yamaha TRI-Z
1985 Kawasaki Tecate KXT250 (x2)
1986 Honda 250R
1986 Honda 350X