Is this for the MSF BRC?
If it is, the actual class doesn't have a limit on the size of the motorcycle, but that might be a local requirement or an Army requirement. (Guessing by your handle that you may be Army).
Either way, the zero should have no problem completing all of the exercises in the BRC. In fact, all of the exercises will be much easier since you wont have to worry about modulating a clutch and the power delivery being so linear. And there are less potential hits on the final test since you can't forget to downshift.
There should be a section where they describe the motorcycle controls and ask if anyone has anything different from the standard control configuration for a bike, you should let them know that you do not have a clutch or gears.
If this isn't for an MSF course then disregard all of that.