three jets?

I am having trouble with my 02 DRZ40S jetting. I ride above 4000 ft. DJ kit. I have replace the middle jet with the wrong jet. How to tell what jet goesthere? 128? 22.5pj? what is the middle jet?

I don't understand your question. You will find 3 jets in the carb float bowl. Main jet (more or less in the middle), pilot jet and starter jet.

Use WD40 in a spray can. Spray it in the middle jet. If the spray comes out where the slide needle goes, that is the main jet. Open the choke, spray in one of the other jets. If the spray comes out the choke opening, that is the starter jet. Spray in the other jet. If it comes out the holes by the throttle plate, that is the pilot jet.

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