I always turn mine off before I shut it down so that it does not leave a large amount of gas in the carburetors. I found that if I do this in that order it starts easier the next time. There may be nothing to this but I have always done this. I have heard some horrific stories like flooding and gas leaking all over the place aor ending up in the sump, filter box, in the exhaust, etc. I just do it out of habit. I am not sure if this is the case on the newer FI models.