Checking for oil leaks
It's a nice feeling when you get a quick solution: keep an eye on it for a while - check for more oil leaking, in case it is slacking off again or the gasket is past its' best (although I have no idea how this happens it did happen to me on a different model of bike!).
Checking for where the oil is coming from:
It can be very difficult to see because the oil spreads very easily and it blows around anyway in the wind blast when you are riding. It was recommended to me to use something like talcum powder once the engine had been cleaned - spread this around anywhere that you think the oil may be originating. I guess you could use handfuls of fine dust if there is no talc available.
Anyway, I was concerned about the talc blowing off the engine in the wind so I wrapped masking tape on the bits of the engine that I suspected - the kind that is using for masking off paintwork - it stains where the oil first appears and it does not come off the engine until you take it off.
This confirmed "my worst fears"!
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Dave
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