[squirrel_hunter]

First clean it up. Secondly check your oil level, how much have you actually lost, is there a puddle on the floor? Oil is very similar to blood, a little can go a long way...

Traditionally the curvy leaks a little from the plastic clutch cover, not sure which model you have?

With the engine clean you might be able to locate it. Things to check are the gaskets around the clutch cover and alternator cover, that there are no bolts loose or missing, that the drain bolt is secure and the sealing washer is doing its job, that the oil filter is secure, that the engine breather hoses are connected to the air box still, and finally that you have a nut on the end of the output shaft (otherwise known as the nut holding your front sprocket on) you will need to remove the sprocket cover to check this. Every thing is basically visual checks in the first instance.