GO-DEVIL Surface Drive Operation Manual And Installation Manual page 12

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.
Since the SD engine is a balanced drive, the prop may initially have a tendency to lift up
and surface too high at top speed without being held by the trim mechanism. If the prop
surfaces too high, a large amount of vibration will be felt at the handle as the prop
blades "slap" the surface of the water. If this happens, bend both trim tabs upward
slightly on the rear with a large crescent wrench as shown in the figure below. For
maximum performance and comfort, you should be able to relax the weight of your arm
and hand comfortably while holding the hand grip at full speed.
above the surface. Different hull designs and horsepower to weight ratios will affect
optimum propeller depth and performance while on plane.
may be reduced to accommodate extremely large hulls and loads.
Starting on May 15
Lever. The EZ Trim Lever allows the prop height to be dropped approximately 5" 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 out of the water and 900 RPMs
in the water at idle.
th
, 2008 all Surface Drive Engines are equipped with an EZ Trim
If the trim tabs are adjusted properly,
the prop should stay down firmly until
the engine is trimmed up to the desired
depth. To adjust the trim while
underway, lightly push down on the
handle to free the trim and turn the trim
knob Clockwise ( ) to trim up and
Counterclockwise ( ) to trim down.
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
If necessary, the drive ratio
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