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jet sizes

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I have a new to me DRZ400 with 3K miles. It runs great but I believe it is running too rich. I never need to choke it to start it and my fuel milage is poor at 44 mpg with highway gearing. The PO opened up the air box and re-jetted it. My question is what is the standard size jet for this bike? tks

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If the PO re-jetted the bike, made a 3X3, what the stock jets were means nothing. If it runs poorly, the solution is to clearly identify/explain when/how it runs poorly. You have provided a tidbit of data when you say it never needs the choke. What are the ambient temps?

I am afraid your first step will be to pull the carb, and open it up and get the current jetting info (keep good notes). Let us know what is in it.

Poor mileage is also related to the size of your smile. 45 to 55 mpg is fairly common.

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