I'll let Ducatiman go into more detail, but whatever you do, don't use any jets from a carb kit! It's best to clean the ones you have, and if you need to replace any, get the exact ones from Keihin.
Also, letting a motorcycle shop clean the carbs is risky, as few know what's really needed for these carbs. Ducatiman did mine, and even though I put a few thousand miles on my 250 and it ran fine, the improvement was spectacular.
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