Why is the shroud off, n' why is the bow pointing IN?

I now have, in various states, THREE 40hp. One is an "early crank" Johnson, has same small taper crank as a 35, have a later "big crank" 40hp Johnson, and a similar Evinrude 40

Yesterday I finished tuning up the one "big crank" Johnson, and it ran GREAT in the tank. But this mid-morning took it out to little Fernan with a lunch and it won't run worth-a-you-know-what. Seemingly not getting enough fuel. I THOUGHT I had everything cleaned out but "not."

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