1988 25hp Johnson, has trouble starting, stutters at full throttle

25 Johnson

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Jul 16, 2008
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Have a 1988 25 hp Johnson outboard. I pull start it. It takes many pulls to get started once I do I have to open the carb for a while when its in neutral to warm it up. If I don't it will shut off and I can't idle it to shift it to drive. Once I get it in gear it runs good at first and i can put it in full throttle with no problem, but once I reduce the speed or idle it won't go full throttle smoothly. When I open the throttle up it stutters, makes voom, voom, voom sound, and doesn't run fast or smoothly. Eventually it just shuts off and I can't get it started for another day. I can get it into gear once a day and it does the same thing. I've replaced the spark plugs and drained the fuel and put new fuel in. What could it be? and how can I fix it?
 
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