I ran into one operating characteristic of a 5 hp that is probably unique to propane. After running for about 5 minutes at WOT (on step in a small dinghy), the engine slowly lost rpm like it is running out of propane and would only maintain about 1/4 throttle. It seems the rapid consumption of fuel (rapid expansion of the liquid from a 1 lb bottle resulted in icing in the carburetor or freezing up of the fuel line. The conditions were cool and humid. I haven't duplicated it yet, but the symptoms were just like carburetor icing.
Tom
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