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Once you have checked out the basics, as advised by FlowSpecialist and assuming everything is as it should be, the next difficult step is finding a dyno shop/operator that knows his way around SU carbs. Sometime ago i fitted twin SU carbs onto my Saab 8v to replace the awful twin Strombergs, i set them up as best i could and then took them to a dyno operator that really knows SU carbs, he ran the car on the dyno a few times and noted the AFR, he whipped out the needles and filed them by hand with a flat swiss file, my intial reaction was shock and i think he saw that by my face, as he assured me it would be OK, i took the car for a spin and it ran so much better than before, smooth and crisp is how i would describe it. Fortunately the dyno is only about an hours drive from my house, the operator new exactly where to remove material on the needle. Of course the downside is that these needles are now unique and if they wear or get damaged, i would have to go through the whole process again.
Hopefully my ramble will give you some reassurance about so-called impossible to get needles.
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