I see this quoted quite often.

Yet if you go by the manufacturer's own prop range recommendation for any given identical displacement, the same prop sizes are suggested.

e.g. a 4 Stoke .50 has the same size recommended prop for a 2 stroke .50.

Given however that the 4S .50 is producing less specific power than the 2 stroke of the same size, relatively speaking you could say that it is indeed "swinging a bigger prop".... but this IMHO seems more of a marketing ploy.

... not that I dislike 4 strokers....

However in the sub 1.00 range it's hard to rationalize paying 300.00-400.00 for a 1.2 four stroke equivalent to a 80.00 .75 2 stroke engine, if the latter is reliable.... yeah they sound and idle nicely, but for the price difference in this range, is it really worth it?