BSA factory correct carb numbers and jet sizing, here is where to go.
porklips.org/~masonmotoamalspecshtml
Plus you can also e-mail the new Amal Burien factory with all your bike original specs, and they will tell you what it came with and the jetting .
Problem with that is it took a week to get my reply, they are slow because of so many e-mails. This site gives it instantly , once you find your model.
