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1. For one thing, I agree, the ram tube cooling is desirable on small air cooled motors over that chintzy water pump they put in their larger motors. It "sort of" works in a barrel, but is ok on a boat on the lake.
2. Now that diaphragm carburetor—I come just a little bit short of despising that thing. I don’t know if yours has a fuel pump or not, but if it does, it is a bladder in the carburetor mounting flange. The carb inlet needle stays closed under a light spring pressure. So, gravity feed from the tank probably won’t open it to let the diaphragm chamber fill with gas prior to starting, making it a beast to get started. Once the motor starts, vacuum acting against the diaphragm pulls it up and opens the inlet needle to get more gas from the tank. If it has the pump bladder, it helps with all that.
Just my 2c.