Electrics should dry out.. spray liberally with WD40, wiring, connectors, ignition switch.. everything.
Battery should be ok if it didn't short-out.
Drain and change the engine oil.
How long did you run the engine while under water.. you may have sucked water into the the air intake/carburetor and thus the engine?
The carburetor may need to be stripped and cleaned out.
The engine... you could take out the spark plug and turn the engine over to clear out any water from the cylinder.
Or take it to a motorcycle shop and they'll do it all for you.