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How is the carb jet diameter measured from?

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Hi

Guys I'm trying to learn about carb jets ,I'm having trouble figuring it out.When we say a 120 jet.now does it refer to the bore of the hollow screws?

Cause I need to drill mine?I need to know what am doing and what about like a pilot jet and has the tiny holes at the bottom of the jet on the sides.what are the other small holes for?

 

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Do not drill jets. Number varies from carb brand and jet manufacturer. Some it is a flow rate, others it is the diameter of the necked down part of the jet, others still, it is an arbitrary number. Buy jets in sizes you want to try.

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