1992 Evinrude 9.9hp running too fat?

[DeanHensler]

I've got a 1992 Evinrude 9.9 that I just purchased. The guy I bought it from ran it in a tank for me and it appeared to run just fine. I got it home and after few weeks of waiting for the weather to clear up, I hooked it up to my boat (this is an electric start, remote controlled motor).

When I got it all hooked up, I gave the primer bulb a few pumps until firm and turned the key to start the motor. It fired right up and ran for about 5 seconds, then died. I then hit the primer bulb again and cranked and cranked and cranked it. It would not start again. After cranking it forver with no start, I decided to pull a spark plug. The plug was very black and wet. I took the other plug out and the same thing. Fouled black and really wet. I cranked the motor a few times with no plugs in it to blow out all the fuel. Lots of mist came out. I blew on the plugs to dry them as much as possible and put them back in the motor. Cranked it and it started again, then died pretty quick. I performed the same procedure again but this time I opend the throttle up quite a bit when starting it. Now it started and ran, but when i lowered the throttle back to idle it would die again.

At this point I made a trip to the parts store to get some fresh spark plugs. After installing those the motor fired right up and would run at high throttle. I even put the motor in gear and throttled up. It will run all day throttled up. When I lower it back to idle it dies. When I checked the new spark plugs after running, they are wet too. It seems like the motor is getting too much fuel and the plugs are getting wet when its at idle speed.

Does this sound right?

How do I adjust the air/fuel mixture? I notied a knob on the front of the motor that appears to be an ajustment screw for the carb. Which way is more or less fuel?

 

[o/b tech]

Re: 1992 Evinrude 9.9hp running too fat?

It sounds like the idle mixture screw on the front of the motor is adjusted too rich. Turn the screw in until the motor starts to stall, then turn the mixture screw back out until it starts to run rich and stall. At that point turn screw back in until you find the half way setting between the two points and this should be good. If this does not work than the carb may have to come off and be cleaned. Also, check the manual adjustment lever on the electric primer as well. The lever should be facing the body of the solenoid. If it is not, than it may be partially open allowing fuel to be drawn into the motor. Hope this info helps.

 

[DeanHensler]

Re: 1992 Evinrude 9.9hp running too fat?

Does anyone have a picture of where the manual adjustment level on the electric primer is supposed to be facing? "facing the body of the solenoid" isn't quite specific enough for me to determine if mine is correct.

 

[Will Bark]

Re: 1992 Evinrude 9.9hp running too fat?

I think he means "horizontal" with the body of the primer; at least that's the way it is on mine. Good luck

 

[DeanHensler]

Re: 1992 Evinrude 9.9hp running too fat?

having the same problem. It will fire up and run if I have the throttle wide open, if I lower it any, the motor dies. I have to remove the spark plugs and blow them off and crank the motor with no plugs in it to get the gas out of there, then put the dry plugs back in it to start it. It will run with the throttle wide open, but die if I back the throttle off. I recorded an 8 minute video to show this and am uploading it to youtube now. I'll post the link when that's available.

I also noticed that the spark plug wires are criss crossed. There is another boat with a Evinrude 9.9 sitting next to mine and I looked at the plug wires on that one, they were going straight across. Top coil to top spark plug. Mine are top coil to bottom spark plug. You'll be able to see what I'm talking about in the video.

It doesn't matter what adjustment I make to the rich/lean knob on the front of the motor. I cranked it all the way down as lean as it would go and opened it up all the way as rich as it would go and noticed no difference. I verfied that its turning by removing the top of the plastic "breather" from the carb and pulling the knob off so I could see the metal screw turning.

The spark plugs are wet and the engine is leaking black oil out the exhaust.

Anyone know what the problem is?

 

[DeanHensler]

Re: 1992 Evinrude 9.9hp running too fat?

ok here's the video. Please take a look. I'm worried I've got the spark plug wires crossed, but i can't imagine it would run at all if those were crossed.

1992 Evinrude 9.9 - YouTube

Please watch the video and let me know what you think.

 

[DeanHensler]

Re: 1992 Evinrude 9.9hp running too fat?

Here's another video, showing the engine die when i decrease the throttle and showing the wet spark plugs.

Plugs Wet - YouTube

 

[nwcove]

Re: 1992 Evinrude 9.9hp running too fat?

have you done a compression test on it? if so, id start by doing a proper carb cleaning and rekit. and just a mention......turning the low speed jet while the motor is revving like that will have no effect, as its running off the high speed jet at that rpm. jmo

 

[DeanHensler]

Re: 1992 Evinrude 9.9hp running too fat?

Yes I did a compression test before I purchased the engine. Both cylinders were at 100 psi. thanks for the note about the low speed jet, I didn't realize there were two different jets and that makes sense.

 

[DeanHensler]

Re: 1992 Evinrude 9.9hp running too fat?

Does anyone know if I've got the spark plug wires correct? I can't imagine this thing would run at 3000 RPM with the plug wires crossed...

 

[AlTn]

Re: 1992 Evinrude 9.9hp running too fat?

wires from the powerpack to each coil should be orange with blue tracer to top cylinder, orange with green tracer to bottom..crossed wires and it won't start...I'd determine spark to both plugs first, then go on to fuel delivery problems

 

[DeanHensler]

Re: 1992 Evinrude 9.9hp running too fat?

I just went out and ran it again. It started right up, but would die immediately unless i give it full throttle. It will run all day at full throttle, but when i back off the throttle it wants to die.

I checked spark on both cylinders and its good. I still have the same issue with the spart plugs being wet with oil.

I tried switching the plug wires and it wouldn't start at all. Switched them back and it starts right up, but again won't idle.

I am at a loss here...

 

[pn]

Re: 1992 Evinrude 9.9hp running too fat?

how bout a stupid pinhole on the fuel pump diaphram. hold it up to light.

 

[w2much]

Re: 1992 Evinrude 9.9hp running too fat?

Agree with pn. Just dealt with the same issue on mine. Pinhole will allow fuel pump to flood out engine , wet plugs ect. An hour later will start right up run then flood out again. Check the fuel pump if ya need one 40.00 on ebay new.

 

[DeanHensler]

Re: 1992 Evinrude 9.9hp running too fat?

Alright it sounds like the fuel pump is the next thing to check. Does anyone have a diagram or picture of where the diaphram is on the fuel pump?

Last night I removed the carb, took it apart and cleaned it, then put it back together and back on the motor today. Exact same problem still so its not the carb.

Anyone know what the part number the rich/lean low speed needle is on a 1992 9.9 carb? Mine could use a replacement.

 

[DeanHensler]

Re: 1992 Evinrude 9.9hp running too fat?

I just took the fuel pump off and took it apart. There were no visible holes in the diaphram. Any other idea's?

 

[DeanHensler]

Re: 1992 Evinrude 9.9hp running too fat?

I also broke the fuel connector on the motor when I tried to remove the fuel pump. Does anyone know the part number for this guy? I'll need to buy another one as I broke the barb off this one.

 

[gozierdt]

Re: 1992 Evinrude 9.9hp running too fat?

The part number is 0438793. It's number 34 on this diagram from MarineEngine.com

Evinrude Lower Engine Cover Parts for 1992 15hp E15EENM Outboard Motor

You can find all the part numbers by going through these exploded views on MarineEngine and several
other suppliers.

 

[w2much]

Re: 1992 Evinrude 9.9hp running too fat?

Any springs pop out on that fuel pump? Could you blow into the intake? Could you blow into the outlet?

 

[DeanHensler]

Re: 1992 Evinrude 9.9hp running too fat?

Any springs pop out on that fuel pump? Could you blow into the intake? Could you blow into the outlet?

There were two springs in it. One in the larger bottom diaphram and one in the smaller upper diaphram. Neither popped out, but I was able to remvoe them, clean them and put them back where they go.

I tried blowing into various parts of the fuel pump as you suggested. It was hard to blow into the two outlets and the intake. If I really blew hard I could, but not easily. What does this mean?