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The Higher the Jet Number the Bigger the hole init so more fuel goes into engine to make it richer, the smaller = vice versa less fuel means lean running.

some carbs a 120 means 1.20 mm diameter

but on Mikuni it is lm flow (milliliter) flows.

so depends on who makes carb.?

but yah bigger is more fuel

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Q: What does carb jet size number mean?
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