Yamaha YXZ 1000RSS Owner's Manual page 105

TIP
 When the knob is set to "DIFF LOCK" or "4WD", the drive mode icon and the indicator light
will flash until the differential gear is completely locked or unlocked.
 Turning the steering wheel back and forth will help the differential gear lock to engage or dis-
engage.
 To protect the drivetrain from damage, vehicle speed is limited until the differential gear lock
has properly transitioned.
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