It’s mentioned in the user manual of my motorbike, that when not using the vehicle, I should turn the petrol tap (the one that has three positions “On”, “Off” and “Reserve”) to “Off” position. I don’t understand why that’s necessary (and I need to understand that for my own knowledge and because my brother won't do it unless I can give him a convincing reason)?
So three questions:
- Is it because petrol may evaporate or flow to the engine un-necessarily when the vehicle is parked and not used for a while (like overnight or just for an hour or two)?
- Is it recommended to always turn off the petrol tap whenever I park my vehicle somewhere or just when I park it in the garage for the night?
- Also, as an additional related question: Why do some people drive their bikes with the petrol tap always kept on “Reserve”? My uncle does it, but refuses to explain it.