Thank you JB.<br />The carbs have butterflies. I've since got a Seloc manual for the Yam 3 cyl, and will do a fuel pump and filter test. But what puzzles me after examining the fuel flow diagram, --- if there's gas in the float bowl, which is right up there with each individual carb venturi, why can't the shutters suck up enough fuel for start, when it's only 2 inches away?<br />Color me puzzled. <br />I have other boats and motors so I'm never stuck, but what the hay, I want everything to run on command.