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Fuel, oxygen, compression and spark and it fas to run. It sounds like you have exhausted remedies for fuel, though you don't sound convincing on the rich/lean adjustment. Clean air filter? Good compression? Strong properly timed spark?
I really don't know anything about these outboards, but it sounds like some of the problems people have with Atomic Fours. Once the fuel system is verified, which is very often the source of problems,then look at spark. Once you verify the ignition system, check compression as a gas engine will idle with low compression, but falter under load.
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