Yamaha 90 hp 2 stroke loses power

[SKG]

1997 Yamaha 90 hp 2 stroke (no oil injection) loses power intermittently. I have noticed it happens mostly after hitting a wake or some rough water. I stop the boat and turn off engine. Then immediately start engine (no problem starting at all) then take off and achieve top speed with no issues. I also have fished all day and it hasnt happened at all. Carbs look clean as do fuel filter, plugs. Fuel does not appear to contain water. Burning ethanol free fuel.

 

[robert graham]

Mine is a 1999 C90 very similar to yours and the one time I had a wake related issue it turned out to be the wiring under the console was bouncing around when I hit the wake....while you're running try jiggling those wires with your hand to try and locate a loose or bad connection....I've since used some tie wraps/zip ties to hold the wiring snug....

 

[SKG]

Mine is a 1999 C90 very similar to yours and the one time I had a wake related issue it turned out to be the wiring under the console was bouncing around when I hit the wake....while you're running try jiggling those wires with your hand to try and locate a loose or bad connection....I've since used some tie wraps/zip ties to hold the wiring snug....

Thanks for the suggestion. I'll check it out the weekend!

 

[robert graham]

My issue was just a bit of corrosion on the tip of in-line fuses....clean, Polish and grease these....