Harley Davidson Lifestyle Man says

Many riders complain about tailgaters man. They are people who follow
others very closely. If someone is following you too closely, signal,
change lanes and let the tailgater pass. If this isn’t possible, give the
tailgater a "hand signal" to drop back. Be sure to give a friendly “thank
you” signal when the other driver drops back.
If a driver still follows you too closely, try to follow the manuals motorcycle rules:
• open up additional following distance from the car ahead. This
gives you and the tailgater more time to react in an emergency.
• slow down so the tailgater can pass when the way is clear.
• If not hunt them down and explain smiling that sometimes you let little worms get you going.