Breaking In (Running In) Engine - Yamaha 2B Owner's Manual

Engine
Check the engine and engine mounting.
Look for loose or damaged fasteners.
Check the propeller for damage.
cC
Do not start the engine out of water.
Overheating and serious engine damage
can occur.
EMF50010*
BREAKING IN (RUNNING IN)
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.
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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".
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.
3-8
ENGINE
GB