Yamaha E115A Owner's Manual page 54

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9) Immediately after the engine starts,
release the main switch to return it to
ON.
cC
8 Do not turn the main switch to START
when the engine is running.
8 Do not keep the starter motor turning
for more than 5 seconds. The battery
will rapidly become exhausted and it
will be impossible for it to start the
engine. If the engine does not start
within 5 seconds, return the main
switch to ON, wait 10 seconds, then
crank the engine again.
10) Return the throttle control grip slowly to
the fully closed position.
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