Here in Wisconsin, the law states that to operate a motorized bike, you have to have at least a regular driver's license, and it is illegal to operate a car or MB without that ID on one's person. If you were to be pulled over and did not have that ID with you, it would be within the officer's jurisdiction to issue a ticket for not having the ID (as well as any other infractions that caused the officer to stop you in the first place).
But whether or not he WILL issue that ticket is, just like Simon said, based on a lot of other factors. The first time I got pulled over for speeding ever, I got just a warning. Second time I got a reduced penalty, probably because I was courteous and cooperative (and didn't try to pull any BS stories about WHY I was speeding).