Honda EM3100CX Owner's Manual page 19

4. Turn the engine switch to the START position and hold it there for 5
seconds or until the engine starts.
After the engine starts, let the engine switch return to the ON
position.
Do not use the electric starter for more than 5 seconds at a time. If the
engine fails to start, release the switch and wait 10 seconds before
operating the starter again.
When the speed of the starter motor drops after a period of time, it is
an indication that the battery should be recharged.
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ON
START
ENGINE SWITCH
ON
START