The Victa roller mowers (Victa Imperial was the name I think) of the 1970s had a 125 with modified G3 carbutettor, mounted with shaft horizontal. I think it was called a Victa power unit with red cowl instead of black and VC 160 style starter.
Were these ever used in other applications?

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