Modern Vespa

I have an lml 150 reed valve engine in my px, it has a mallosi 166 kit ported to suit. it has a dellorto si20/20 carb, BGM BBT exhaust, what jetting is recomended for this set up, do i need to go bigger with the carb or will jetting be enough? TIA

First, make sure you drill out this passage on the SI carb, otherwise you won't be able to jet rich enough. https://www.youtube.com/watch?v=K7TJXHEAfaA

What jets are you running right now?

I have a somewhat similar setup to yours (listed in my signature). Right now I'm at 140 AC, BE5 mixer (the LML stock E3 is pretty close to this), and 130 main jet. 52/140 pilot screw 2.5 turns out.

I suggest starting slightly richer all around than this and walking it down from there.