Yamaha 100A Owner's Manual page 70

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8 If the emergency switch is held up too
long, too much oil will be pumped into
the engine tank, overflowing it. Release
the switch when oil reaches the upper
level line on the engine oil tank.
8 The oil feed pump will not operate if
the engine is tilted more than 35°. Put
the engine in the down position before
operating the emergency switch.
8 Do not use this emergency procedure
in place of the oil level warning lamps
are installed and working.
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GB