Determining The Mounting Height Of The Outboard - TOHATSU MD 25B2 JET Owner's Manual

Determining the Mounting Height of the Outboard

The following outboard mounting height settings will work good for most applications, however,
because of different boat/hull designs, the setting should be rechecked by test running the boat.
Refer to Water Testing.
• Installing the outboard too high on the transom will allow the water intake to suck in air and
cause cavitation. Cavitation causes the engine to overspeed in spurts and reduce thrust. This
condition should be avoided by proper height setting.
• Installing the outboard too low on the transom will allow excessive drag.
BOATS WITH A "V" BOTTOM HULL
1.
Measure the width of the leading edge on the water intake housing.
Make a horizontal line on the transom up from the "V" bottom the same length as the width of
the water intake housing.
a - Horizontal line
b - Width of the leading edge on the water intake housing
2.
Place (center) the outboard on the boat transom.
Set the height of the outboard on the boat transom so that the front edge of the water intake
housing is in line with the horizontal line made in step 1. Fasten the outboard to the transom at
this height.
a
b
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