Check for spark.

All there is to make a bike run is fuel and fire.
you can turn the little screws on the bottom of the carb bowls if there is fuel there. Then pull spark plug wire insert a sparkplug to the end of the wire and ground to head.

I have no faith in human perfectability. I think that human exertion will have no appreciable effect upon humanity. Man is now only more active - not more happy - nor more wise, than he was 6000 years ago. Edgar Allan Poe