Yep, I saw where you were going. The best way to dry out the engine is to run it at full throttle and pinch the line closed then wait for it to die. The high revs will soon sweep out any fuel that's enough to actually fire and the run down to a stop sweeps out the remainder that's too lean for ignition. But learning from your experience, keep the fuel line pinched for a few seconds after the engine has stopped to allow the residual pressure in the tank to flow back through the muffler or it'll just push some fuel back into the carb. Then drain the tank.