Water Testing - TOHATSU MD 35B2 JET Owner's Manual

M25 Jet Drive
BOATS WITH A FLAT BOTTOM HULL
1.
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 bottom of the boat as shown. Fasten outboard to the transom at this
height.

Water Testing

CHECKING FOR CAVITATION
The initial outboard height setting should be close to the optimum setting for the outboard.
However, because of the hull design of some boats, obstructions, or imperfections in the hull
ahead of the water intake, adjustments may be required to prevent cavitation at running speeds.
When operating the boat, the outboard driveshaft housing should be vertical, or tilted toward
the boat, when planing to provide a scooping angle on the water intake. Tilting the outboard
out beyond a vertical position reduces the scoop angle and can cause impeller slippage and
cavitation.
IMPORTANT
NOTE : Slight cavitation in sharp turns and rough water is acceptable, but
excessive cavitation is harmful to the outboard and should be avoided.
Test run the boat. If cavitation occurs (air enters the pump), the first thing to try
is lowering the outboard mounting height.
: If the angle of the boat transom does not allow the driveshaft housing
to be positioned vertical, a wedge kit should be installed behind the
transom brackets to increase the tilt-in angle.
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