Yamaha 15F, Owner'S Manual

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EMU01534
BREAKING IN (RUNNING IN)
ENGINE
Your new engine requires a period of break-
in (running-in) to allow mating surfaces of
moving parts to wear-in evenly. Correct
break-in (running-in) will help ensure proper
performance and longer engine life.
c C
Failure to follow the break-in (running-in)
procedure may result in reduced engine
life or even severe engine damage.
Break-in (running-in) time:10 hours
Break-in (running-in) premix ratio:
Refer to “GASOLINE/PETROL AND
OIL MIXING”.
EMU01538
Run the engine under load (in gear with a
propeller installed) as follows.
1)
First 10 minutes:
Run the engine at the lowest possible
speed. A fast idle in neutral is best.
2) Next 50 minutes:
Do not exceed half throttle (approxi-
mately 3,000 r/min). Vary engine speed
occasionally. If you have an easy-plan-
ing boat, accelerate at full throttle onto
plane, then immediately reduce the
throttle to 3,000 r/min or less.
3) Second hour:
Accelerate at full throttle onto plane,
then reduce engine speed to three-
quarter throttle (approximately 4,000
r/min). Vary engine speed occasionally.
Run at full throttle for one minute, then
allow about 10 minutes of operation at
three-quarter throttle or less to let the
engine cool.
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