its not grease, its patina, and its nothing to worry about. In fact it may have served very well as a preservative of the original finish.
And it washes off with mineral spirits, varsol, lacquer thinner, gasoline, WD-40, take yer pick.
It’s nothing but dirt that has accumulated from sitting. Motor has obviously been laying on its back for several years, judging by the way the rubber spark plug booted melted and dripped onto the side of the tank. Tank looks relatively un-beaten up, by the way.
PM T2
He's livin' in his own private Idaho..... I hope to go out quietly in my sleep, like my grand-dad did..... and not screaming, like the passengers in his car...