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INSTALLATION HEIGHT CHECK
Optimum outboard motor installation height varies with boat type
and bottom shape. Contact the boat manufacture for any special
recommendations that are unique to a specific model of boat.
• If the outboard motor is installed too low
– The boat will squat and be hard to plane.
– The boat high-speed stability will be reduced.
– The boat will tend to porpoise.
• If the outboard motor is installed too high
– Cavitation may occur when making a turn, which prevents the
boat from smooth cruising.
Measure the boat transom height (1).
On "V" bottom boats, measure the transom height which is the
distance from the top edge of the boat transom to the point at which
the vertical line passing the inner edge of the anti-ventilation plate
intersects with the boat bottom.
Calculate the outboard shaft length requirement. Match the
appropriate outboard shaft length to your boat transom height.
Outboard Motor Transom Height (1)
Long:
508 mm (20 in)
Extra long:
635 mm (25 in)
Extra-extra long: 762 mm (30 in)
Workable Boat Transom Height (2)
Long:
483 – 508 mm (19 – 20 in)
Extra long:
610 – 635 mm (24 – 25 in)
Extra-extra long: 737 – 762 mm (29 – 30 in)
To determine outboard shaft length requirement, subtract the motor
transom height and the boat transom height/ the difference should
be approximately 0 – 25 mm (0 – 1 in) which is the installation height
range (3).
BF175AK3/BF200AK3/BF225AK3/BF250A
SINGLE OUTBOARD
DUAL OUTBOARDS
OUTBOARD MOTOR
CENTER LINE
190 mm
(7.5 in)
(3)
(1)
(1)
BOAT TRANSOM
HEIGHT
ANTI-VENTILATION
PLATE INNER EDGE
(1)
(2)
15
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