Would a Victa motor pass an immersion test? I don't have faith that the carburettor would keep it out, nor the exhaust end.
I remember a scene in the movie Leatherface : The Texas Chainsaw Massacre 3 where his saw was operating underwater with only the bar sticking out while the chain was still moving around!!

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