How much is motorcycle insurance for a 16 year old male with a ninja 250?

It varies state to state, town to town, zipcode to zipcode. It also varies by what other vehicles are on the plan, what class of license you possess, your MVR, your level of coverage desired, safety courses you have taken, etc.

Call and get quotes. Visit those online insurance places you've seen on TV, you already know the ones I'm talking about. Every single one will quote you a different amount.