In Maine are you supposed to have a driver's license to drive a dirt bike?
By dirt bike do you mean and enduro bike or a motocross bike or
some other bike at all? For any bike except motocross bike you
definitely need license, and for motocross bike you don't, because
you can't ride it on the streets at all... You can only use it in
motocross tracks and for that you need to have a special
permit...