Scooterotica

Have a look on Camblambs website, they have carb jetting details for their kits with different pipes. I used it a couple of years ago and they were very close

I know mine was running an expansion chamber but had it setup on dellort 28 and it was great, then out of interest it was swapped for a 26, and setup again, within half hour or so on the same dyno, gained bhp, about .8 at peak power, ran clean and nice, it had a 28 on it before it went to dyno, and used considerably more fuel than the 26 did.