don't get too excited
it's a Honda. That's a huge one in your favor. The engine is not damaged for Pete's sake.
bikes don't like to sit, especially with all the damn corn in the fuel nowadays, it really turns to shiit. (oh, sorry hall monitors....I meant poopy)
Take that bad injector out, blip the terminals a few times with a AA battery or a 3v lithium (DON'T use 12 volts), soak it in kerosene overnight (or carb cleaner or Stabil), dry it off, and blip the terminals again. If it's bad anyways, you've got nothing to lose. It will probably come back. Don't hit it with a hammer (we save that trick for seized fuel pumps
) but tap it on the bench a few times as a last resort.
An injector is like a solenoid. It can get stuck. If blipping it with a AA makes a clicking sound, go ahead and blow through it backwards
with the air hose (watch your eyes!)
You can take a reading in ohms, it should be somewhere around 12.
Worst case scenario, send me a pic of it. If it matches some of the other Honda injectors I have, you can have one. Don't go buying four new ones. That's rediculous.
Once you get the bike going, add some Stabil as per the instructions the way you should've when you parked it and run it for a while. This will help clean the others.