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9.9 4 stroke running rough

Discussion Forum at MarineEngine.com » Yamaha Outboard » 9.9 4 stroke running rough « Previous Next »

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chris roper
New member
Username: croper

Post Number: 1
Registered: 07-2009
Posted on Tuesday, July 28, 2009 - 10:28 pm:   Edit Post Delete Post View Post/Check IP

i have a mid 90's yamaha 9.9 4 stroke that has been giving me some trouble. It starts beautifully and will rev perfectly but in about 20 seconds it idles a bit rougfh and if you try to give it some throttle it craps out and almost stalls. If ytou turn it down it will idle but a bit rough. I have changed plugs, removed and cleaned out t5he carb jets, and used most of a can of combustuion chamber cleaner and I still have the same problem. The odd thing is that every time I start it it runs great for that 20 msec and then it does the same thing. Maybe a fuel pump?
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Daniel Seliger
New member
Username: dansel

Post Number: 1
Registered: 10-2009
Posted on Saturday, October 10, 2009 - 06:21 pm:   Edit Post Delete Post View Post/Check IP

I have the same problem. I appear to have overcome it dying completely by adjusting the idle screw to a satisfying position, but the engine still wanders at idle and even when in gear at low RPMs. Have you found a solution yet?
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brian guse
Member
Username: mtcooler

Post Number: 5
Registered: 07-2009
Posted on Sunday, October 11, 2009 - 12:00 am:   Edit Post Delete Post View Post/Check IP

had the same problem with my 94 9.9 4 stroke found the problem to be the intake gasket had a small crack in it.
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jamie campbell
Advanced Member
Username: outboard_doctor

Post Number: 652
Registered: 02-2009
Posted on Monday, October 12, 2009 - 03:46 am:   Edit Post Delete Post View Post/Check IP

ou have a fuel pump problem once you prime up the carbys it will run great untill the fuel level in the bowl drops. Replace the fuel pump

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