Super Jet Wont start in water - Gone through everything

Location
Uk
Had this same problem..... Turned out to be s snapped reed petal.
Is fuel blowing back up through the carbs or carb when cranking?
 
Also had exact same problem would start on land but when under load it would just keep cranking and cranking. Ended up being some of the reed petals being broken. Just take your carb off and remove your intake manifold and check out your reeds. You should be able to tell if that's the problem or not almost immediately
 
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