Oil on spark plug electrodes

[His Dudeness]

[quote author=Deefer666 link=topic=15187.msg172697#msg172697 date=1415261298]
Valve stem oil seals..... Quite common now that these bikes are getting older, especially on the low mileage ones that have been sat around for extended periods of time.

+1  :thumbup
[/quote]

That would explain why it's running fine even though it's burning oil. Is replacing valve stem seals a difficult job? I've never done it