outboard motor - RC Groups
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Jun 19, 2004, 07:54 PM
Registered User
Aviron's Avatar

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?
Jun 19, 2004, 07:59 PM
God is good
Viper Pilot's Avatar
Are you using old gas??
Jun 19, 2004, 08:15 PM
Registered User
Does it keep running if you squeeze the bulb on the fuel line?
Jun 19, 2004, 08:59 PM
El Queso Grande
Is the choke closing?
Jun 19, 2004, 10:27 PM
aka: Dances with Buzzards
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.........................
Jun 20, 2004, 02:14 AM
Registered User
Aviron's Avatar
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.
Jun 20, 2004, 02:33 AM
characters welcome!
Mark Wood's Avatar
Try a cranky McCullogh chain saw...

Jun 20, 2004, 02:47 PM
Vertical Wake
splatman's Avatar
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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