Operation, Lehr – LEHR 9.9 HP 4-STROKE User Manual

Page 14

LEHR

OPERATION

When the boat is on plane, a bow-up attitude results in less drag, greater stability and efficiency. This is
generally when the keel line of the boat is up about 3 to 5 degrees. With the bow up, the bow of the boat may
have a greater tendency to steer to one side or the other. Compensate for this as you steer. The trim tab
can also be adjusted to help to help offset this effect. When the bow is down, it is easier to accelerate from
a standing start onto plane.

BOW UP

Too much trim-out puts the bow of the boat too high in the water. Performance and economy are decreased
because the hull of the boat is pushing the water and there is more drag. Excessive trim-out can also cause
the propeller to ventilate, which reduces performance further, and the boat may “porpoise” (hop in the water)
which could throw the operator and passengers overboard.

BOW DOWN

Too much trim-in causes the boat to “plow” through the water, decreasing fuel economy and making it hard
to increase speed. Operating with excessive trim-in at higher speeds also makes the boat unstable.
Resistance at the bow is greatly increased, heightening the danger of “bow steering” and making operation
difficult and dangerous.

NOTE: Depending on the type of boat, the outboard motor trim angle may have little effect on the trim of the
boat when operating.

TILTING UP AND DOWN

If the engine will be stopped for some time and the boat is moored in shallows, the outboard motor should
be tilted up to protect the propeller and casing from damage from collision with obstructions, and also to
reduce salt corrosion.

WARNING: Before tilting the outboard motor, follow the procedure under “Stopping Engine” in this section.
Never tilt the outboard motor while the engine is running. Sever damage from overheating can
result. Do not tilt the engine by pushing the tiller handle alone because this could break the
handle. Hold from the rear of the top cover to help tilt the engine up and down. Keep the power
unit higher than the propeller at all times otherwise water could run into the cylinder and cause
damage. The outboard motor cannot be tilted while in reverse.

WARNING: Be sure all people are clear of the outboard motor when tilting up and down, also be careful not
to pinch any body parts between the drive unit and engine bracket.

Follow the procedures in “Tilt Lock Mechanism” on pg 6 for tilting the engine up and down instructions.

PULL FROM HERE

WATER LINE