Scorpion Exhaust problems

What it is,, is that I have a vespa GT125 and it had a standard exhaust and it rotted away so I've brought a scorpion and fitted that now the scooter will not go over 40mph and it takes awhile to do that as well. Have you got any ideas what it could be ?? I have been told that it could be the weight of the rollers as standard one are to heavy for a scorpion,, Can you help ??

I have 8.5g rollers fitted at the moment.

Hey Baggers,

you need to set the Mainjet from the carburetor. Do you change another parts? Airfilter? Cylinder?

 

Greetz

Jan

Baggers,

seems nobody speaks English here, so i am glas to meet you.

Can you please e-mail me and i would like to call you someday or at least write to you.

Thanks,

GRTSCTT

[email protected]