Yamaha C40A, Owner'S Manual

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3-8
EMF50011
BREAKING IN (RUNNING IN)
ENGINE
Your new engine requires a period of
break-in (running-in) to allow mating sur-
faces 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.
EMU00226*
Run the engine under load (in gear with a
propeller installed) as follows.
1)
First 10 minutes:
Run the engine at the lowest possi-
ble-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-planing boat, accelerate at full
throttle onto plane, then immediately
reduce the throttle to 3,000 r/min or
less.
Break-in (running-in) time: 10 hours
Break-in (running-in) premix ratio:
Refer to “Gasoline/Petrol and Oil
Mixing”.
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