Canned air works. However, the air gets very cold causing the engine to get very cold and slow down quickly. Here is a link to a video of it running. To connect the canned air, I turned a piece of brass to fit the port on one side and the rubber hose on the other. The hose is fuel line from an RC airplane. Notice the sophisticated hose clamp holding the hose the plastic spray nozzle.
http://rcazparts.com/mill/jinglebell5.mpg