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.