1. the pipes may look low, but they're tucked in enough that you will drag the footpegs first.
2. The kill switch isn't as hardy as the key switch. I think another reason for this warning is that using the kill switch for normal shutdown can easily lead to forgetting to shut off the key. This will leave things on that will drain the battery and could overheat.
3. Along with the pump losing the cooling effects of the fuel, the mixture will start to lean out as the pump starts picking up air bubbles. This lean mixture will cause excessive heat in the exhaust system and fry the converters.
