This is the center of the main jet stack, and it has small holes in the sides. The rating on this type is BE1-BE5. These ratings don't seem to have any rhyme or reason. For example, a BE4 does not necessarily let in more fuel than a BE2. Most people leave this stock and work with the main and air jets.
Jetting is something that takes trial and error. See our blog of jetting instructions for more info.
Atomizer Jet BE2; SI Carbs
Dellorto SI Jets
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