Modern Vespa

I am installing a pollini exhaust on my P200e - does anyone know what I need to do to the carb to make this work well?

Thanks!

You will need to change out your main jet to a larger size. Make sure you do a plug chop to make sure you not running too rich or too lean. It's trial and error..enjoy!

Start 120 or 122 main, yep plug chop too.

Is your carb 20/20 or 24/24?

Cheers

it is a 24/24 - and I do not know what a plug chop is, could you please explain?

Thanks a lot!

This is helpful:

http://incriminators.series1studio.com/plugchop.html

A 120 will likely do you fine provided you are within a couple thousand feet above sea level.

I'm about to fit a polini expansion exhaust too.
I'm happy with rejetting and all that, but I got a secondhand chamber for really really cheap which needs a little welding (stinger has broken out of the back) and I need to know the diameter of this stinger pipe.
if possible I'd love to know the length from where the stinger pokes out of the chamber to the end of your muffler too so that i get the overall length right.