In my course we were taught to use the kill switch but leave the bike in neutral. I always turn it off with my key cause the kill switch as mentioned by others is assembled with plastic parts. I always leave it in neutral in my parents garage just in case they need to move as they do not know how to turn the bike on (only biker in family). Now that I know a good reason for the leaving the bike in gear i will start doing that especially when i'm parking on a incline. You learn something every day.
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I'm not small, I'm fun sized