Volvo Penta D25A MS Operator's Manual page 26

Operation
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26
4. Fine-tuning of the engine speed can be done by
turning the control knob:
Turn the knob clockwise to decrease engine
speed. Turn it counterclockwise to increase
engine speed.
5. Bring the manual speed control knob in the neutral
position when ready with the manual speed
adjustment. Turn the lock clockwise to secure the
installation.
6. Connect the control cable for remote speed
adjustment so that the engine can be controlled
from the normal position.