Aerox 70cc mhr rep no acceleration

Hi I've just rebuilt my aerox engine has a 70cc mallosi mhr rep head and piston
Mallossi crank
Stage 6 bearings
17.5mm carb
Mk1 stage 6 pro rep exhaust
Polline variator 6g rollers
Stage 6 clutch with soft contra spring
My issue is it has no pullaway power and struggles to get to 30mph I have tried all sort different jets which gets the bike running perfect on the stand but as soon as I pull away it has no power.

I've tried a stage 6 oversized variator with 3.5g rollers aswell and have the same problem

Have 125 compression

 

You really need to start with one tuning thing, barrel 1st, see how it runs then fit other parts so you know what's working or not ?. You'll need to work it out to find what works .