Having become accustomed to the standard repair manual advice to "replace if
it shows signs of wear", I have grown a bit skeptical over the years. I have
a lot of equipment still operating with "worn" parts, and I don't think I
could afford to replace everything to new condition.
When it comes to carb needles, though, I'm in the dark. I checked the two SM
needles in SU H6 carbs on my TR3A, and both showed a slight degree of bending
as I rolled them on glass. The tips on both wobbled ever so slightly to the
same degree as I rolled the shank. My question is, do I need new needles and
jets, or is being out of concentricity to a small degree acceptable? At what
point does it become a real performance issue?
Thanks for any tips as I'm relatively new to the fixed needle S.U.s.
Enjoy those spring days!
Bill Stagg
1961 TR3A
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