Mercury 250 XS OptiMax Operation, Maintenance & Installation Manual page 107

OUTBOARD INSTALLATION
1. Mark four mounting holes on the transom using the transom drilling
fixture.
a
c
Transom Drilling Fixture
2. Drill four 13.5 mm (17/32 in.) mounting holes.
eng
b
a
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5489
97
a - Drill guide holes
b - Transom drilling fixture
c - Transom centerline
91‑98234A2
Aids in engine installation by acting as a
template for engine mounting holes.
3973