3-12
Outboard motor mounting
7. Install the mounting bolts, and then tight-
en the nuts firmly.
Make sure that the clamp brackets do not
bite into the boat transom.
8. Tighten the locknuts firmly.
Outboard motor mounting height
4-stroke engines are heavier than 2-stroke en-
gines of the same horsepower. Therefore, if a
2-stroke outboard motor is replaced with a 4-
stroke outboard motor, the boat will become
“stern heavy”. Also, the water line will rise and
become closer to the power unit. If the water
line is too close to the power head, poor en-
gine performance could result, and water
could enter the cylinders and damage the en-
gine.
When mounting a 4-stroke outboard motor to
a boat, make sure that the mounting height
between the water surface and the clamp
bracket seating point is not less than the spec-
ified minimum mounting height “a”. Measure
the mounting height when the boat is moored
and carrying the maximum load.
95–115 mm
(3.7–4.5 in)
M12 × 170
mm
(6.69 in)
90101-
12068
115 mm
(4.5 in) or
more
M12 × 180
mm
(7.09 in)
90101-
12073
M12 × 200
mm
(7.87 in)
90101-
12074
M12 × 210
mm
(8.27 in)
90101-
12069
M12 × 230
mm
(9.06 in)
90101-
12070
Boat tran-
som thick-
ness (D)
Mounting
bolt size
Part number
Minimum mounting height “a”
100 mm (3.9 in)
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