Forgot to mention that the long spring inside the carb comes in different
spring rates, which makes a difference also in how the carb performs.
Basically the spring slows the rise of the piston, affecting air/fuel mix when
staring from a dead stop and in other sudden demand situations. I've also
heard
of, though never felt the need myself, of folks shortening the spring to
"custom tune."
On my su's, with spring biased KN needles, the spring is yellow (the
different rate springs are color coded).
If you can get a copy of the Haynes SU carb manual, it explain the theory
better than I. It also has a long list of needles with their dimensions and
original applications.
Also give Joe Curto a call. He is a pleasant and helpful guy and knows more
about British carbs than anyone else I've ever met. His shop is in the
Bronx, he advertises in the usual places.
Jim
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