For best performance trim the sterndrive so that the boat bottom is at a 3–5° angle to the water.
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Trimming the sterndrive up (out) can:
• Generally increase top speed
• Increase clearance over submerged objects or a shallow bottom
• Cause the boat to accelerate and plane off slower
• In excess, cause boat porpoising (bouncing) or propeller ventilation
• Cause engine overheating if trimmed up (out) to a point where any cooling water intake holes are above the waterline
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Trimming the sterndrive down (in) can:
• Help the boat accelerate and plane off quicker
• Generally improve the ride in choppy water
• In most cases, reduce boat speed
• If in excess, lower the bow of some boats to a point at which they begin to plow with their bow in the water while on plane.
This can result in an unexpected turn in either direction called bow steering or oversteering if any turn is attempted or if a
significant wave is encountered.
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Single Engine Trim and Trailer
Single engine applications have a button that can be pressed to trim the sterndrive unit up (out) or down (in).
To raise the sterndrive for trailering, beaching, launching, low‑speed (below 1200 RPM), and shallow water operation push the
trim button to raise the sterndrive to the full up (out) position.
Some controls also have a trailer button that trims the sterndrive to a position suitable for trailer purposes only.
Dual Engine Trim and Trailer
NOTICE
If using external tie bars, raising or lowering the drives independently of each other can damage the drive and steering
systems. If using an external tie bar, raise and lower all drives together as a unit.
Section 1 - Getting to Know Your Power Package
90-8M0145546 eng MAY 2018 Page 7
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