I'm just glad they work to any decent capacity. I hate pulling apart a Victa carburettor and snorkel. I did one mod to a full crank only because it needed a carburettor fitted when I found it. I made a mess of the slopes of the cam but it goes well. Only thing is all throttle control takes place in the first quarter of moving the lever up! The rest makes no difference.
At least it ticks over well.

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