Mercury 100 FourStroke, Service Manual

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7A-26 - ATTACHMENTS/CONTROL LINKAGE 90-830234R3 DECEMBER 1997
Installing Outboard Motor on
Transom
Determining Recommended
Outboard Mounting Height
Boat Speed (MPH) – Maximum Speed Anticipated
e
c
b
d
a
e
IMPORTANT: Add 5 in. (12.7cm) to Mounting
Height for “XL” Models.
a - This solid line is recommended to determine the outboard
mounting height dimension. Use transom mounting bolt
holes that will position outboard nearest to the recom-
mended height. After engine break-in (if necessary), raise
or lower outboard one position at a time to attain best per-
formance. See “Important” immediately following.
IMPORTANT: Increasing the height of outboard
generally will provide the following: 1) Less
steering torque, 2) more top speed, 3) greater
boat stability, but, 4) will cause more prop “break
loose” which may be particularly noticeable
when planing off or with load.
b - These broken lines represent the extremes of known suc-
cessful outboard mounting height dimensions.
c - This line may be preferred to determine outboard mounting
height dimension, if maximum speed is the only objective.
d - This line may be preferred to determine outboard mounting
height dimension for dual outboard installation.
e - Outboard mounting height (height of outboard transom
bracket from bottom of boat transom). For heights over
22 in. (560mm), a propeller, that is specifically designed for
surfacing operation, such as the “Chopper” series, usually
is preferred.
Locate Centerline of Boat Transom
Locate (and mark with pencil) vertical centerline of
boat transom, as shown.
a
A B
C D
NOTE: Dimensions “A” and “B” and “C” and “D” are
equal length.