It's an ingenious design from a manufacturing standpoint.
You look at the one piece casting for the engine block and the saving on material and components that goes into it and you can see what Victa had accomplished here with no compromise to performance and minimal penalty to outright durability that would be of little to no detriment to the average punter anyway.

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