The oil light on the Fazers is for the oil level not pressure and is extremely sensitive to oil level. With the bike on the stand on level you need to have the oil at the top line. Common on a lot of Yamahas. 2L and just over it is not enough and the Oil light is telling you. Oil light does not come on if overfilled
Oil quantity:
Without oil filter cartridge replacement: 2.5 L
With oil filter cartridge replacement: 2.7 L
Oil quantity:
Without oil filter cartridge replacement: 2.5 L
With oil filter cartridge replacement: 2.7 L