From my Xciting 500 owner's manual:
Engine oil level check
(see page 67)
NOTE:
Check the engine oil level each day before riding the scooter.
The level must be maintained between the upper (1) and lower level (2) marks on the oil filler
cap/dipstick.
1. Start the engine and let it idle for a few minutes. Make sure the red low oil pressure indicator
goes off. If the light remains on, stop the engine immediately.
2. Stop the engine and put the scooter on its center stand on level ground.
3. After a few minutes, remove the oil filler cap/dipstick, wipe it clean, and reinsert the oil filler
cap/dipstick without screwing it in. Remove the oil filler cap/dipstick. The oil level should be
between the upper and lower marks on the oil filler cap/dipstick.
4. If required, add the specified oil up to the
upper level mark. Do not overfill.
5. Reinstall the oil filler cap/dipstick. Check for oil leaks.