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Old Jun 19, 2004, 07:54 PM
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Aviron's Avatar
Vancouver Intl, Canada
Joined Dec 1996
347 Posts
outboard motor

Thought I'd post here for some help. I have an 8 HP Yamaha 4 stroke outboard motor that is having some problems. It starts easily, and idles but as soon as you give it any throttle, it stutters and quits. If you start at a higher throttle, it revs up for 1-2 seconds and then slows and quits.

Ideas? I am not a motorhead type person, but I am handy... check the fuel filter? spark plugs?
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Old Jun 19, 2004, 07:59 PM
God is good
Viper Pilot's Avatar
Banjul
Joined Jan 2001
4,246 Posts
Are you using old gas??
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Old Jun 19, 2004, 08:15 PM
Registered User
Ontario, Canada
Joined Apr 2000
93 Posts
Does it keep running if you squeeze the bulb on the fuel line?
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Old Jun 19, 2004, 08:59 PM
El Queso Grande
Rippin in Hood River, OR, USA
Joined Oct 2000
1,141 Posts
Is the choke closing?
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Old Jun 19, 2004, 10:27 PM
aka: Dances with Buzzards
ICTHRMLS's Avatar
TX
Joined Jun 2002
454 Posts
Sounds like fuel starvation of some sorts. There are multilple causes for that but you might look for the following.

Clogged fuel filter
Cracked fuel line
Debris in carburator bowl
Bad fuel pump (if equipped)
Water in fuel

Just some suggestions.........................
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Old Jun 20, 2004, 02:14 AM
Registered User
Aviron's Avatar
Vancouver Intl, Canada
Joined Dec 1996
347 Posts
There really isn't anything that can get me cursing more than an outboard engine...

I'll try those things and get back to ya.
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Old Jun 20, 2004, 02:33 AM
characters welcome!
Mark Wood's Avatar
United States, CA, Bear Valley Springs
Joined Feb 2000
26,499 Posts
Try a cranky McCullogh chain saw...

mw
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Old Jun 20, 2004, 02:47 PM
Vertical Wake
splatman's Avatar
visalia ca
Joined Dec 2002
735 Posts
Sounds like a fuel problem. I'm not too familiar with the 4-cycle OBs, but if it's a transition problem (idle to full throttle), it sounds like a clogged jet (high speed) or even an accelerator pump (if it has one). Like someone mentioned earlier, if pumping the fuel bulb helps, it could be a fuel pump problem.
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