Mercury 200 Verado Manual page 49

FEATURES AND CONTROLS
3. Trim switch (if equipped) - Pressing the trim switch allows the
engine to trim up or down.
4. Throttle only button - Allows the boat operator to increase
engine RPM for warm-up, without shifting the engine into gear.
To engage throttle only, move the control handle into the
neutral position. Press the throttle only button while moving
the control handle ahead to the forward detent. The horn
indicates throttle only is engaged. Advance throttle to increase
engine RPM. To disengage, return control handle to neutral
position. Engine RPM is limited to prevent engine damage.
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