In Illinois, a motorcycle may have:

In Illinois, all motorcycles must have a white license plate light. Modifying mufflers to increase the noise level is prohibited, and handlebars should be no higher than the operator's head when they are seated in a normal riding position. Passengers may not ride on a motorcycle unless vehicle and its seat are designed to carry two people.

• A modified muffler to make it louder.
• Handlebars higher than the head of a seated operator.
• A blue license plate light.
• A seat designed to carry two people.