I found this mower a couple of years ago and gave it a thorough wash about a year ago and I've noticed oil has leaked on the base (arrow) from the manifold area.
I tested it with aerostart not long after getting it and it fired and sounded like it ran well.
They're a good looking motor but seem to be problematic.

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IMG_20220128_002651_copy_1000x564.jpg (59.25 KB, 39 downloads)

Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!