OPERATION
57
Some boat performance can be regained by dropping to a lower
pitch propeller but engine performance will still remain lower. In
some cases, a gear ratio reduction may be more beneficial. To
optimize engine performance, prop the engine to allow it to operate
at or near the top end of the recommended maximum RPM range
at wide-open-throttle with a normal boat load.
Other advantages to propeller or gear ratio changes:
• Reduces the possibility of detonation.
• Enhances overall reliability and durability of the engine.
Setting Trim Angle While Running Engine at Idle
Speed
Submerging the exhaust relief hole on the outboard can happen
on some boats if you trim full in while running at idle speed,
resulting in, exhaust restriction, rough idle, excessive smoke, and
fouled spark plugs. If this condition exists, trim outboard up until
exhaust relief hole is out of the water.
or35-1
a
b
a - Relief hole submerged (wrong)
b - Relief hole above water line (correct)
Operating in Shallow Water
When operating your boat in shallow water, you can tilt the
outboard beyond the maximum trim range to prevent hitting
bottom.
!
CAUTION
Avoid engine or transom damage. Do not exceed 2000 RPM
when the outboard is being operated in the tilt range.
1. Reduce engine speed below 2000 RPM.
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