Fyi...it is Really hard to ride wheelies on scooters...seriously.
Anything with a centrifigal clutch requires Perfect balance. There is no throttle adjustment to help, as if you let off for only a split second, the front falls, too long, and over you go.
I've been trying to perfect it for years.
But, after busting my ass several times, and my buddies risking a stroke from hysterical laughter, I usually call it a day after a dozen tries or so, lol.