I assume by "useable" you mean to charge an electric dirtbike, but to answer (and since you are posting in the General section), we need to know the specs of the charger you are plugging into it. Or at least what bike you are plugging in and if it's a stock charger.
That also doesn't say if the Amps is max/surge amps or continuious/rated amps, but let's assume continuous/rated amps. If you are plugging in a 240v charger, it should be one that draws (not outputs) 16.5 amps or less. If you plugging in a 120v charger, it should draw 33amps or less.
What does your charger say for voltage and max draw (not output)?
Also, please update the title of the thread to something that describes the subject. "Yes or No?" is a bit click-batey, no? Ha. If nothing else, for those using the search engine (on the forum or on google), a good subject will help users find threads on subjects that they want to know more about. The first line of your post ("Is this a useable generator") would be an informative thread subject as I expect generator capability would be a subject others would search for.