I changed oil in upper and lower units, impeller is new, I replaced spark plugs, but still it doesn't want to idle, epecially under load, wants to sputter and shut off. In the end it got a little bit better after spraying with carb cleaner, but still it vibrates and sputters a bit. I'd appreciate any advice on how to make it run smoother. Should I adjust idle RPM? Is there anything else wrong with it? The engine is 1989, used on a sailboat fur just several hours per season. When I got it 3 years ago it was fully services and looks almost new inside.
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9.9 HP Yamaha outboard idle problems and carburetor spraying with carb cleaner
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