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Mariner 40 power loss

Hi guys

I have a Mariner 40 that looses power in rough waters.
its intermittend going tru rough water highand low revs
when i play with the choke during high power setting,it seems get more oemf

Attached is a photo of the engine,im not sure about the year model
 

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Check float levels as to low they can starve engine(lean) and if to high flood motor when it hits wave(common problem when racing)
 
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