Modern Vespa

I have a stock 1979 P200 that always starts 2nd kick (with choke) cold, first kick warm. I transported it on a trailer for six hours, unloaded and it wouldn't start! After a dozen or so kicks, I gave it full throttle and after a few more tries it reluctantly started. After that it ran and started normally. Same thing when I brought it back home.

Any ideas what might have been going on?

Off the top of my head, I'm guessing it was flooded from the float bouncing around. Was the gas turned off at the petcock?

Yep. Flooded. All the gas in the carb and fuel line emptied into the cylinder.

Run it out of gas before you load it on the trailer.

Thanks for the replies.
Should have mentioned, fuel tap off both times, I didn't run it out of gas the first time, but I did the 2nd and had the same result.

Flooding does fit, so maybe all the bouncing allowed fuel past a closed tap. 🤔

Those fuel taps fall apart and just stop working. Mine will not turn off. I think a new one is in your future. They are cheap. A needle valve in good condition should stop fuel from entering the cylinder, but not when bouncing around on a trailer.