Re: reason behind turning the fuel petcock off?
When the cheapa$$ petcock that they provide with the kits goes bad, you'll know why it's there. Trust me. If (or when) it works correctly, then using it can save a lot of headaches, like an engine full of gas and gas all over the floor, etc.
The glass bowl fuel filter I have now has a petcock built in. And it works so perfectly. On most cases the kit ones are okay, but now and then you get a lemon. Let us spare you the trouble of learning the hard way: let us advise you to turn off the petcock when not in use. You'll be happier.
"There is nothing wrong with wanting a motorbike that is an extension of your personal taste and fashion sense; if you must ride somewhere, I say do it with style