Remove the small screw that holds it in place. Then, pull in the lever and lock it.

If your clutch is dragging, that's a waste of time. You will want to remove the cable end, adjust the cable adjustment at the lever and the engine to the middle of their respective adjustments, then have a helper push the arm until good resistance is felt. Re-install the cable end.

That will usually do it.

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If it ain't broke, and you mess with it long enough, it will be.