Help with making a scooter power wheelie

I was wondering if someone could help me getting my 70cc 2 stroke scooter to power wheelie, i have tried installing 7k rpm clutch springs and tightening them on a polini adjustable clutch with 5.5g, 6g and 6.5g roller weights but still nothing. Does anyone know what you need to get a power wheelie? Help would be appreciated.