Honda EM50is Owner's Manual page 24

1.Remove the oil filler cap.
2.Check the oil level. If it is below the upper limit, fill with the 
recommended oil to the upper limit (see page 21).
3.Reinstall the oil filler cap securely.
CAUTION:
Running the engine with insufficient oil can cause serious engine 
damage.
NOTE:
The Oil Alert system will automatically stop the engine before the oil
level falls below the safe limit. However, to avoid the inconvenience of
an unexpected shutdown, it is still advisable to visually inspect the oil
level regularly.
UPPER LEVEL
OIL FILLER CAP
22