Hi and congrads
The mixture screw is located as shown on the pic. This is the carb from an old XT550. As far as I know the mixture screw is the same on your bike.
Please note that this is not an air screw. To get the mixture more rich screw out. To lean out the mixture, screw in.
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Yamaha XT600E '01, Honda XR400 '03, Yamaha XT550 '83
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