What kind of trouble will you be in for riding a motorcycle on the streets of California without a motorcycle license but a valid ca DL?

Generally a ticket but could be as severe as loosing your liscense or bike. Alot of it depends on circumstances, for instance if your liscense just expired the cop might let you off with a warning but if you have 2 tickets and a ticked off judge he could sieze your bike. Point being, it's 30 bucks to get a liscense do it.