Yamaha Aerox Acceleration Problem

Hi all,

I have a Yamaha aerox with a stage 6 exhaust, 80main jet and recently just fitted a polini variator, polini belt and 6.9g roller but not yet put the spring in the clutch as don't have the socket set at the moment. Before I put the variator in it was a fast ped went about 50-55mph, now it takes ages for it to kicking and don't accelerate it takes ages going from 0-35mph and no faster need help thanks