Breaking In Engine; Procedure For 4-Stroke Models - Yamaha F225 Owner's Manual

Operation
height. Consult your Yamaha dealer or boat
manufacturer for further information on deter-
mining the proper mounting height.
ECM01630
CAUTION:
During water testing, check the buoyan-
G
cy of the boat, at rest, with its maximum
load. Check that the static water level on
the exhaust housing is low enough to
prevent water entry into the power head
when water rises due to waves when the
outboard is not running.
Incorrect engine height or obstructions
G
to the smooth flow of water (such as the
design or condition of the boat, or ac-
cessories such as transom ladders or
depth finder transducers) can create air-
borne water spray while the boat is
cruising. If the motor is operated contin-
uously in the presence of airborne water
spray, enough water could enter the en-
gine through the intake opening on the
cowling to cause severe engine dam-
age. Eliminate the cause of the airborne
water spray.
40
EMU30173
Your new engine requires a period of break-in
to allow mating surfaces of moving parts to
wear in evenly. Correct break-in will help en-
sure proper performance and longer engine
life.
ECM00800
CAUTION:
Failure to follow the break-in procedure
could result in reduced engine life or even
severe engine damage.
ZMU01762
EMU27083

Procedure for 4-stroke models

Your new engine requires a period of ten-
hours break-in to allow mating surfaces of
moving parts to wear in evenly. Correct break-
in will help ensure proper performance and
longer engine life.
NOTE:
Failure to follow the break-in procedure could
result in reduced engine life or even severe
engine damage. Run the engine in the water,
under load (in gear with a propeller installed)
as follows. For ten hours for breaking in en-
gine avoid extended idling, rough water and
crowded areas.
1. For the first hour of operation:
Run the engine at varying speeds up to
2000 r/min or approximately half throttle.
2. For the second hour of operation:
Increase engine speed as much as nec-
essary to put the boat on plane (but avoid
full-throttle operation), then back off on
the throttle while keeping the boat at a
planing speed.
3. Remaining eight hours:
Run the engine at any speed. However,
avoid operating at full throttle for more
than 5 minutes at a time.

Breaking in engine