My first bike was a 76 CB750, I rode around with a budy on his new (or newish) 500 Interceptor. He was popping wheelies all the time so I tried it. As reported by others, throttle snap alone won't do it. One evening, as we rode through a McDonalds parking lot being tough motorcycle riding teenagers doing our level best to attract the attentions of the girls, I decided it was time. I was coasting slowly, I pulled in the clutch, tached it up, and dumped the clutch.
I wheelied.
It was the lamest wheelie in history, but the front wheel was off the gound by a good 6" for at least 2-3 feet.
Rob