Torque; Trim - Pro-Line Boats 24 Walkarounds Owner's Manual

 Release the choke as engine smoothes out.
For a Hot Engine-
 Leave the throttle closed and choke off.
 * If engine fails to start in 5 seconds, partially open throttle (out of gear)
and try again.
 If flooded, keep throttle open for a few minutes and then crank. When
engine starts close throttle smoothly as the engine clears to prevent over
revving.
After your engine starts make sure to observe a few basic rules to ensure that the engine is
functioning properly:
 Verify oil pressure and water circulation.
 Check the water temperature gauge for the first few minutes to make sure the engine is
warming properly.
 Check for leaks especially fuel, shut down and correct if found.
 Follow the break- in procedures for your engine.
 * After engine is warm and after the necessary break- in, drive the boat at
full throttle for a few moments ( if conditions permit) to verify engine is
developing full RPM.

Torque

The twisting force that the engine applies to the prop lists the hull of your boat in the opposite
direction the propeller is turning. For a large engine or light hull this list can be considerable. A
listing hull has more drag on the side that is deeper in the water causing boat to turn in the direction
of the list. The trim tab on your out drive should be adjusted to counteract the torque steer for the
load and speed the boat is most often operated at. Consult your engine manual for specific
information on trim tab adjustment. Torque induced list can also be corrected by shifting the load in
your boat. Twin engines, when counter rotating, cancel the torque and no correction is required.

Trim

The power trim system allows the operator to raise and lower the drive unit or motor throughout an
infinite number of settings between its upper and lower limits. For every throttle setting there is a
trim setting that will yield optimal speed, stability or maneuverability.
For most conditions the best all-round performance is obtained when the bow of the boat is slightly
out of the water.
General trim down (or "in") characteristics are:
 Starting position for best acceleration to plane.
 Lowers bow in the water providing better stability and ride in rough water.
 Reduces boat speed and economy due to increased drag of hull and drive.
 More spray over bow.
General trim up (or "out") characteristics are:
 Raises the bow of the boat in the water, resulting in less hull in the water.
 Greater speed and economy for a given throttle setting.
 Greater maneuverability (provided prop does not ventilate during the
maneuver)
 In excess, the reduced stability can lead to bouncing, porpoiseing and
propeller ventilation.