1979 Evinrude 9.9HP Help

[JtJr09]

Hi I have a 1979 Evinrude 10EL79B Serial # E5045498 that is not running right. I can get the motor to fire after a few pulls if I hold the throttle wide open. It will run with the throttle opened up, but as soon as I go to idle it down it shuts off and acts like it is running out of fuel?? Any ideas???

I recently purchased it from someone who had installed the 15HP carb on the motor, to make it a 15HP.

Any help would be great, I am really lost and do not know much about outboards.

 

[AlTn]

Re: 1979 Evinrude 9.9HP Help

if you'll google...sschapterpsa...you'll see OMC 9.9-15hp...read Leeroy's Ramblings.concerning carb rebuilding...fuel pumps...and carb to ignition timing...it'll be a starting point..also if it's a new to you motor...change the impeller and lower unit oil...outboardbooks.com or ebay are sources of factory manuals

 

[guidosarduchi]

Re: 1979 Evinrude 9.9HP Help

Sounds like it is running similar to my 83 15 hp Johnson when I bought it. After rebuilding the carb and replacing the original cork float with a metal one, it made a world of difference. The only trouble I had after that was because I didn't set the float drop. Great motors.

 

[mark1961]

Re: 1979 Evinrude 9.9HP Help

Hi I have a 1979 Evinrude 10EL79B Serial # E5045498 that is not running right. I can get the motor to fire after a few pulls if I hold the throttle wide open. It will run with the throttle opened up, but as soon as I go to idle it down it shuts off and acts like it is running out of fuel?? Any ideas???

I recently purchased it from someone who had installed the 15HP carb on the motor, to make it a 15HP.

Any help would be great, I am really lost and do not know much about outboards.

The idle passage in the carb is blocked.....rebuild it following the info already provided.

 

[dew2]

Re: 1979 Evinrude 9.9HP Help

Do you have a compression tester?How about a spark tester.I'd start with those.If compression is OK and spark is OK.You could try to set the carb fuel air mixture.If that dont help.the intake and leaf plates are I believe the same for the 9.9 and 15,.
Make sure the fuel lines are good and not drawing air.Try a spalsh of mixed fuel into the cylinders,remove the plugs and put a 1/2teaspoon MIXED fuel in each then start it.
Try that see what happens.It may need a carb rebuild

 

[JtJr09]

Re: 1979 Evinrude 9.9HP Help

It has spark, and I have not tested the compression. The carb is brand new. I have the box and receipt to prove it, from the person I bought it from. So rebuilding doesnt seem like the answer, but hey what do i know.

 

[dew2]

Re: 1979 Evinrude 9.9HP Help

Do the fuel in each cylinder,if it runs then dies when that little fuel is gone,It will be a carb problem.

 

[mark1961]

Re: 1979 Evinrude 9.9HP Help

The carb is brand new. I have the box and receipt to prove it, from the person I bought it from. So rebuilding doesnt seem like the answer, but hey what do i know.

The carb could be NOS for all we/you know and been sitting in that box for years so it dont mean that much really. It only takes a tiny amount of dirt from anywhere to restrict one of the passages inside the carb and you have an issue on your hands. A carb rebuild kit should not be necessary provided you dont tear up a gasket when pulling apart, disassemble and give it a thorough clean and blow out all passages with compressed air, if it ends up not solving the problem all it has really cost you is a bit of your time.