Yamaha 2A Owner's Manual page 45

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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.
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 occasional-
ly. Run at full throttle for one minute,
then allow about 10 minutes of oper-
ation at three-quarter throttle or less
to let the engine cool.
4) Third through tenth hours:
Avoid operating at full throttle for
more than 5 minutes at a time. Let
the engine cool between full-throttle
runs. Vary engine speed occasional-
ly.
5) After the first 10 hours:
Operate the engine normally. Use the
standard premix ratio of gasoline :
Oil. (Refer to "Gasoline/Petrol and Oil
Mixing".)
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