Originally Posted by slimvulcanrider
first place to start is finding a carb that will flow the correct cfm, then design an intake that will deliver the fuel/air mix to the engine in an efficient manner, and third hook it all up... as for what to use.. you are on your own there bud... my buddy and I were thinking of using a webber carb, or a carter YF downdraft carb.
Of all the people on this site you are only one of maybe two or three that I think always has good info!!
I think that you and your buddy are looking in the wrong place if you want to measure CFM. I don't believe that that carb matters as much as the intake manifold for measuring flow.
My Kawasaki 650 KLR runs a 40mm CV carb.
My Bultaco 370 Pursang runs a 40mm Amal.
My Suzuki 1200 Bandit runs four 36mm CV's.
A Harley big twin runs the same carb as my KLR but with different jets of coarse.
The carb that I would use for this project would be a 40 CV. They are a great carb and parts for them are very cheap. I have adapted this carb to many different bikes with a lot of great results.
Go to any Swap Meet and I am sure that you can pick up a good used one for $25 to $30. If you know anybody that works at a Harley shop you could get one for cheap from the guy that just put on that S&S. I did that. Got four for free!!!!!
Good luck if you proceed with this project.
Somebody could make some serious money with this setup! You could sell just the manifold or complete with carb and basic jet set-up.