I modify the RC needle valve from the carb to be used as a post style needle valve. I like this setup because it allows the fuel line a straight shot to the assy, and puts the adjustment opposite the muffler when mounted inverted. I use the same diameter as the carb, but forget exactly what that was right now.
I cant compare to an Enya as I don't have one. The weight without muffler is ~6 oz's.