I would take a look at the countershaft seal (the seal behind the sprocket), but the flywheel cover gasket is easy to change too. Just be careful to reseat the rubber grommet that the wires pass through correctly. (This could also be a source of your leak)
Neutral switch?
Take off the sprocket cover, clean the area thoroughly with brake cleaner, then go for a short ride to see if you can locate the leak. (A bit of baby powder sprinkled around first might help show where it's coming from before the drips start)