Welcome Ian. Please take a moment to edit your post with a proper introduction.

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Welcome from PEI. It sounds odd as there is no oil in the starter. The engine breather tube is above the the starter, i wonder if it could be leaking and trickling down on to the starter.
 
Welcome from New Jersey USA.
I’m guessing you removed the starter and had a good look around? Have never herd of oil leaking from the crankcase at the starter. Like Jake said maybe from above?? Valve cover gasket? Good luck!!
 
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