Oh we drain the carb on the YFZ also when we stand it and it has a fuel shut off , dunno that one isnt mine. The manual gives directions to transport the 400 standing, so thats what we followed. Wsky70 explained to me about the petcock and gave me some tips for both bikes.
As far as why we stand them, well we only have a truck so if we want to ride then we have to stand one or both. Weekend trips require both to be standing, day trips mine stays on all 4. We are working on getting a trailer.
I would go ride every weekend if I could, but I haven't bought myself a truck just yet . My bike is stored at my sisters place with her boyfriends bike and he is the only one with a truck, so I am dependent on others for now.
I am sure I will get a chance to ride with some people with more experience and more knowledge to share than my group currently has and I will benefit from them greatly.
Thanks for the offer! Hope to see you out there some time, enjoy your weekend.