1. The standard trim control switch is located
on the control le ver handle.
2. The switch controls the position of the ster n
drive or outboard motor . Proper trim is ver y
important in boating .
3. In the case of low or hea vy bow attitude, the
boat tends to “plow”
(Figure 7.2)
. The low er
unit is trimmed too far under or forw ard. Trim
the unit UP (out) to cor rect this situation.
4. If the bow is too high, the boat tends to “por-
poise”
(Figure 7.2)
. The drive unit is trimmed
up or out too far . Trim DN (in) to cor rect.
5. A good practice is to get underw ay (espe-
cially when fully loaded or pulling a skier)
with the unit trimmed all the w ay DN (under).
After the boat is on plane, adjust the trim
out slightly to obtain the proper bow attitude
and engine speed.
6. Trim also affects propeller selection and fuel
efficiency. All models should be “propped”
to be in the upper half of the maximum RPM
range with the boat lightly loaded and the
drive trimmed up to maximum. This configu-
ration allows the engine to operate within
the recommended RPM range with a hea vy
load.
The power unit should ne ver be trimmed up
to a point where the propeller ca vitates (or
slips). A rapid increase in engine RPM’ s is
evidence of ca vitation. If this occur s acci-
7-7
TRIM
TRIM
TRIM
INCORRECT
Causes boat to "plow"
CORRECT
Gives maximum performance
INCORRECT
Causes boat to "porpoise"
DN
TRIM
UP
DN
TRIM
UP
DN
TRIM
UP
FIGURE 7.2 TRIMMING THE BOA T OUTDRIVE
Note: Correct trim angle will vary with different boat and engine combinations.
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