Breather tubes
 

I noticed there was oil on the left side of my rear tyre before going out for a spin this morning.

Not sure where the oil has come from, maybe fling from the chain.

The large rubber breather hose/tube from the air box has a bung or plug in it. There is another big rubber hose that looks crimped so don't think those 2 are responsible.

What are the 3 smaller rubber tubes for? I assume they come from the carb.

The hose form the airbox with a plug in it is a drainhose, to drain the airbox from water and oil if the bike has puked a bit.

The oil you see could be from damaged seals around the CS sprocket or the gearlever.

Thanks Jens, I will check around the front sprocket and gear lever for leaks.