Since I park the bike in my garage, I left the seat off and left the garage light on all night. I had just returned home so the engine was hot. I figured mama mouse moved her brood away from the bike to a dark, cool location. I have not seen her since.
I should check my airbox to make sure my filter was not the source of her nesting material.
Somebody told me I should have moved her next to a box with a hole in the side to encourage her to make that her home instead of my motorcycle.
Normally, I would trap mice but these babies made me think of my pregnant daughter and I could not bring myself to harm them.