Genuine dellorto

Smaller pilot jet if it's loading up and bigger if it's out more than 3-3.5 turns.
Everywhere I was reading, was saying drop 2 pilot sizes. So I'm running a 42 pilot now, do I go to a 40 pilot? Or would 2 sizes down be a 38? My pilot jets are marked by 2's, I got 30-60 pilot jets.
 
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