When riding with a passenger, you should:

The added weight of a passenger will affect the handling of your motorcycle. Expect your motorcycle to accelerate more slowly than usual, turn more slowly than usual, and require extra space to come to a complete stop. Ride more slowly, start slowing sooner when approaching a stop, open up a larger space cushion, and wait for larger gaps when crossing, entering, or merging into traffic.
DMV Writen Test