Trim Tab Adjustment - Mercury GO BOLDLY 25 EFI Operation, Maintenance And Installation Manual

• Tilting the outboard out beyond a vertical position
• Cavitation of the propeller due to rough water or obstruction in the boat
hull
When the engine overspeed limiter is activated, the engine timing will be
momentarily retarded to decrease the engine speed. Excessive overspeed
(above 6300 RPM) will result in cutout of the cylinders to prevent operation
above this limit.

Trim Tab Adjustment

Propeller steering torque will cause your boat to pull in one direction. This
steering torque is a normal result from your outboard not trimmed with the
propeller shaft parallel to the water surface. The trim tab can help to
compensate for this steering torque in many cases and can be adjusted within
limits to reduce any unequal steering effort.
NOTE: Trim tab adjustment will have little effect reducing steering torque if the
outboard is installed with the anti‑ventilation plate approximately 50 mm (2 in.)
or more above the boat bottom.
MODELS WITHOUT POWER TRIM
Operate your boat at normal cruising speed trimmed to desired position by
installing the tilt pin in the desired tilt pin hole. Turn your boat left and right and
note the direction the boat turns more easily.
If adjustment is necessary, loosen trim tab bolt and make small adjustments at
a time. If the boat turns more easily to the left, move the trailing edge of trim tab
to the left. If the boat turns more easily to the right move the trailing edge of trim
tab to the right. Retighten bolt and retest.
MODELS WITH POWER TRIM
Operate your boat at normal cruising speed, trimmed to desired position. Turn
your boat left and right and note the direction the boat turns more easily.
If adjustment is necessary, loosen trim tab bolt and make small adjustments at
a time. If the boat turns more easily to the left, move the trailing edge of trim tab
to the left. If the boat turns more easily to the right move the trailing edge of trim
tab to the right. Tighten bolt and retest.
FEATURES AND CONTROLS
9989
72
eng