Drilling Outboard Mounting Holes - Mercury 250 XS OptiMax Operation, Maintenance & Installation Manual

IMPORTANT: The recommended mounting height is based on performance
testing with a single‑engine application on a hull with no stepped or notched
transoms. Your performance results may vary, depending on hull design.
For best overall performance on boats with Sport Master gearcases, try to
mount the outboard so the propeller shaft centerline is even with the bottom of
the boat, as this gearcase is designed for surfacing applications.
c
722.6 mm
(28.45 in.)
a - Underside of transom bracket hooks
b - Bottom of the boat
c - Distance between "a" and "b"
d - Propeller shaft centerline
Item
Model
1.
20 in. driveshaft models
c

Drilling Outboard Mounting Holes

IMPORTANT: Before drilling any mounting holes, carefully read Determining
Outboard Mounting Height and install outboard to the nearest recommended
mounting height.
1. Some models may not be available with this outboard.
OUTBOARD INSTALLATION
Recommended Mounting Height Range
685–732 mm (27–30 in.)
96
a
b
d
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