[greenaero]

I've been stopped many times by LEOs, often for no apparent reason. As stated by others, the LEO can stop you for ' probable cause" which translates to virtually reason that the officer can come up with. The LEO would need to have actual evidence that you had violated the law before they can cite you for an infraction. The LEOs are constantly scanning for suspicious vehicles and motos unfortunately fall in that category. As frustrating as it can be at times, stay cool and be respectful, you should survive the encounter unscathed.
The OP handled the situation fine and has nothing to worry about.