update
Well he got the engine back from the latest mechanic. He said the bar that links the three carbs was bent (How that would happen-who knows?) and the middle carb was sticky.
He gets the boat back and the spit & spudder is gone, but the plugs were still loading up after about 15 min.
Engine is now going back to same mech. to replace middle carb and rebuild the other two.
He tried the decarb and normally runs 6 gal tanks.
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