Piaggio NRG 50, really slow until 7.5k revs.

[DillHD]

So I bought a Piaggio NRG 2 days ago while I was driving it back at every red light the bike would not move, it would hit 10mph if that then it would gradually get faster untill it hits 7.5k

then the bike just goes and I mean it really goes, upto 60mph!

I talked to a friend of mine who's been fixing, tuning bikes for decades he said because someone has put a Stage 6 performance exhaust on it and not bothered to change anything like the variator/rollers he also said something about my(riders) weight.

I'm just here for a second opinion as he has not physically seen the bike.

The bike will take around 3 seconds to actually start moving then will stay around 10mph untill the revs go up and as soon as it hits the 7.5k mark the bike really does go, me not being too engine savvy this absolutely baffles me. I also asked about maybe up jetting, he said it would be healthier for the bike but wouldn't make much difference in the problem. This is a moped so I'm sorry if this is in the wrong thread.

Thank you! -Dylan.

[eastanglianbiker]

your mechanic sounds about right if it has exhaust like that on it then good chance the roller weights will need increasing and variator sorting