from norton1973, It may not be what you want to hear, I just had my whole top-end done by a shop in Nashville, with one ADDITION, a Makuni 34mm carb. I had pulled my hair out trying to get the amals perfect, not to mention getting the ticklers right and not leaking, etc. I was reluctant to go with a single carb, and it not be a amal. However, I have never been happier, no issues at all. The choke is perfect. Single lever, and 1 or 2 kicks max, and she fires right up. Idles like never before. Once you drive a Norton with one you'll nver go back. Best thing I've ever done. Very, Very smooth!