My business partner's CBR600F seems to have sprung an oil leak. It's bad enough that it's getting oil onto the back tyre - and at the speeds he rides, that's quite an issue 
Think it's been there for a while, dripping away behind the fairing, but it's getting worse.
Funny thing is, the oil seems to be weeping, slowly but surely from a tiny hole just above the exhaust pipe:
You can see it glistening just opposite that rather rusty bolt...
It's certainly part of the casting and intended to be there - but apart from that I've no idea. Anyone seen anything like this before? Any ideas what the hell that little hole is for (apart from pissing oil out of)? Any ideas how to sort it?
Cheers

Think it's been there for a while, dripping away behind the fairing, but it's getting worse.
Funny thing is, the oil seems to be weeping, slowly but surely from a tiny hole just above the exhaust pipe:
You can see it glistening just opposite that rather rusty bolt...

It's certainly part of the casting and intended to be there - but apart from that I've no idea. Anyone seen anything like this before? Any ideas what the hell that little hole is for (apart from pissing oil out of)? Any ideas how to sort it?
Cheers