Weld a nut to the stud, if you have little to play with.
Before you try to remove it, heat it up with gas (if not recently welded). Bang it maybe 10 times with a hammer, use an extension if you can’t hit it directly. If it does not move with moderate force, stop and heat/bang it again.
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Yamaha XT600E '01, Honda XR400 '03, Yamaha XT550 '83
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