Mercury 250 Specifications download pdf (Page 99)

OUTBOARD INSTALLATION

NOTICE

1. The outboard should be mounted high enough on the transom so the

exhaust relief hole will stay at least 25.4 mm (1 in.) above the waterline

when the engine is running at idle speed. Having the exhaust relief hole

above the waterline will prevent exhaust restrictions. Exhaust restrictions

will result in poor performance at idle.

2. Add 12.7 cm (5 in.) for XL models to the listed outboard mounting heights.

3. The mounting height of the outboard must not exceed 63.5 cm (25 in.) for

L models, 76 cm (30 in.) for XL models. Mounting the outboard higher may

cause damage to the gearcase components.

Increasing the mounting height will usually:

• Reduce steering torque

• Increase top speed

• Increase boat stability

• Cause propeller to break loose during planing

Drilling Outboard Mounting Holes

IMPORTANT: Before drilling any mounting holes, carefully read

Determining Recommended Outboard Mounting Height and install

outboard to the nearest recommended mounting height.

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Mercury 250 Specifications Page 99