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Old 31-12-2017, 08:42   #1
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Yamaha 25HP quits at 2300 RPM

I am stumped. 25 HP 4 stroke Yamaha outboard 2010. Carb is clean as a whistle, all channels blown out.

Starts right up, idles great, goes into gear and accelerates to about 2200 rpm. Then dies. No sputters, no coughs. 2200 runs, 2300 dies.

Jets are clear. Fuel Starvation? Never seen that cause an engine to shut down without a stutter of some kind.
Yamaha says there are no electronics that could cause it.

Any ideas would be very helpful.

Brent
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Old 31-12-2017, 16:34   #2
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Re: Yamaha 25HP quits at 2300 RPM

Try pumping the primer bulb after starting and see if it keeps running. Sounds like it could be a fuel pump problem.
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Old 02-01-2018, 10:26   #3
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Re: Yamaha 25HP quits at 2300 RPM

I will try that. It can't hurt. I can't imagine how a fuel pump would stop at 2300 but that doesn't mean it can't.
Thanks
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Old 02-01-2018, 15:11   #4
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Re: Yamaha 25HP quits at 2300 RPM

Not stop, just unable to deliver enough fuel, the level in the float bowl drops below the jets and the engine stops.
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Old 02-01-2018, 15:32   #5
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Re: Yamaha 25HP quits at 2300 RPM

low oil level auto shutoff?
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Old 02-01-2018, 17:53   #6
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Re: Yamaha 25HP quits at 2300 RPM

NoTies is correct, run the boat again and when the problem begins try pumping the primer bulb. If problem goes away while pumping, you could have an air leak in the fuel line or a clogged fuel filter. If engine dies while pumping, you probably have an electrical issue, and need to check plugs, then stator
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Old 02-01-2018, 18:30   #7
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Re: Yamaha 25HP quits at 2300 RPM

I went through an intermitent running problem with my 5 hp Nissan. Turned out I had switched the deadman key between my 115 Yamaha and the Nissan and they were slightly different thickness. Was about to replace the switch on the Nissan when I discovered the real issue. Long shot, but might disconnect the switch on the Yamama see if it helps.
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Old 02-01-2018, 18:49   #8
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Re: Yamaha 25HP quits at 2300 RPM

Quote:
Originally Posted by flyingfin View Post
NoTies is correct,
I would insert "possibly" in that sentence somewhere. I was wrong once about 27 years ago, it might be time I was wrong again.
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Old 02-01-2018, 21:46   #9
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Re: Yamaha 25HP quits at 2300 RPM

I will give the squeeze bulb a try. As soon as the weather here in the gulf climbs back above 40f.
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Old 24-02-2018, 17:47   #10
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Re: Yamaha 25HP quits at 2300 RPM

Tried all suggestions, pumping the bulb makes no difference. It starts, idles smooth, powers up to 2200 push past and it chokes out.

Anymore ideas?
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