2009 yamaha 40 hp for stroke issue

by Lucas harnack
(Timmins ON)

I have a 2009 Yamaha 40 horsepower Outboard 4-stroke. When I was using it 2 days ago I started it as usual got up on plane and it usually runs around 58 thousand RPM. After about a mile and a half it died down to 4000 RPM and continually got worse. I check the oil and it was over full and had a smell of gas. I drain the oil out to the full level check my fuel lines fuel filter and everything was okay. I tried the boat and it's still doing the same thing. I will change my oil but I'm wondering if there's something else that could be causing this?

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