First they are not rules, they are famous motorcycle quotes:
Here are some more
If you ride like there's no tomorrow, there won't be.
Most motorcycle problems are caused by the nut that connects the handlebars to the saddle.
Four wheels move the body. Two wheels move the soul
If you don't ride in the rain, you don't ride
Sometimes the best communication happens when you're on separate bikes.
When you're riding lead, don't spit
Never ride faster than your guardian angel can fly
Everyone crashes. Some get back on. Some don't. Some can't.