GASOLINE STERNDRIVE INSTALLATION MANUAL
Page 112 of 137
90-860172011
WIDE-OPEN-THROTTLE TEST
IMPORTANT: To run engine at full throttle before the break-in period is complete,
follow this procedure.
1. Start engine and run at idle rpm until normal operating temperature is reached.
2. Run boat up on plane.
3. Advance engine rpm (in 200 rpm increments) until engine reaches its maximum rated
rpm.
4. To test if the correct propeller has been installed, operate boat (with normal load on
board) at WOT and check rpm with an accurate tachometer. Engine rpm should be near
top of the specified range so that, under a heavy load, engine speed will not fall below
specifications. If engine speed is too high, replace propeller with a higher pitch propeller.
Normally a 1 inch propeller pitch change causes an rpm change of 150 rpm.
5. Shut off engine.
6. Check coolant level and add coolant if necessary.
TRIM TAB ADJUSTMENT (3.0L MODELS ONLY)
IMPORTANT: If power package is equipped with Power Steering, set trim tab so trail-
ing edge is straight back. No adjustment is needed.
Models with Manual Steering: Operate boat at normal cruising speed, trimmed to desired
position. Turn steering wheel left and right, noting in which direction the wheel turns more
easily.
With engine OFF and boat at rest, remove plug from drive shaft housing and loosen attach-
ing screw.
A. If boat turns more easily to left, move trailing edge of trim tab to the left.
B. If boat turns more easily to the right, move trailing edge of trim tab to the right.
Tighten attaching screw securely and install plug. Operate boat to check setting. Readjust
trim tab if needed.
A.
B.