8
Manual Trim Adjustment
WARNING!! – The trim knob is angled outward and away from a pinch point between the
engine and transom bracket. DO NOT PLACE HANDS BENEATH THE ENGINE WHILE
IT IS RUNNING!!! If the skeg or prop strikes an obstruction while underway, the engine
may tilt violently and cause injury. With the boat floating at rest, set the trim low enough
to fully submerge the propeller and cavitation plate below the waters surface. After getting
up on plane and to full throttle, take notice of the propeller depth.
Trim the engine up until maximum performance and comfort is achieved. For the average
boat and engine combination, the prop should be run with approximately 1/3 of its
diameter above the surface. (Shown below) Different hull designs and horsepower to
weight ratios will affect optimum propeller depth and performance while on plane. If
necessary, the drive ratio may be reduced to accommodate extremely large hulls and
loads.
Starting on May 15
th
, 2008 all Surface Drive Engines are equipped with an EZ Trim Lever.
The EZ Trim Lever allows the prop height to be dropped approximately 9” without
adjusting the manual trim knob. This allows a smooth and efficient transition between
your trim height for running on plane and “digging” out of a situation where you are stuck
or in extremely shallow water. Simply push down on the Surface Drive handle and flip
down the EZ Trim Lever to drop your prop height. After getting on plane and you are in a
sufficient water depth, push down on the Surface Drive handle again and flip the EZ Trim
Lever back up to come back to your normal trim height.
An engine mounted tachometer/hour meter is a highly recommended accessory since it
allows you to view both engine rpm and total run time. Maximum performance will
generally be achieved between 3400-3800 RPM since the engines make maximum
horsepower within this range. Idle RPM should be 1100-1200 out of the water and 900
RPMs in the water at idle.
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