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Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3471
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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I have a yamaha 90 four stroke that is running rough. It

Customer Question

i have a yamaha 90 four stroke that is running rough. It appears to be cutting out i think from catching air
Submitted: 9 months ago.
Category: Boat
Expert:  Charles replied 9 months ago.

Hello, my name is***** will assist you.

Expert:  Charles replied 9 months ago.

With the engine cutting out from excessive air, you are loosing the fuel going to the cylinders. The course of action would be to remove the carbs, tear them down and clean them using a good quality carb cleaner and compressed air. replace the needles, and all o-rings. Reassemble then, then do a water set up on them.

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