I use to power wheelie but as said above, before you know it you're going way too fast and have to bring it down. Now I do mine in 2nd gear at about 30-40mph and can ride out the rest of the gear in it. Im also interested in making it last longer but after reading the side effects, I think I may stick to my existing method. Working for me just fine.
Sprockets make a huge deal! That's prob why, but I can pick it up from anywhere from 60 to 90 if I want, but I like doing it at lower rpms and slowly letting the speed increase, but I want to be able to ride a wheelie and keep it at the constant speed..