1992 15 HP Evinrude no idling

[ChrisAunchman]

Hi All,
Alright so I think this is my first post. I have a 1992 Evinrude that will NOT stay idling. Here is what I know and checked:

- I performed a compression check values where 105 PSI for each cylinder
- I did a quick spark check and I am getting a nice strong spark to both cylinders
- I cleaned the plugs they where a little fouled
- I tore down the carburator this weekend, I didn't see anything obvious I did
the basic carb cleaning blowing through and cleaning passages, needle did not
look worn
- I set the low speed idle screw at 1 1/2 turns out for a baseline.

My questions are does my compression seem alright? The motor seems to run alright at WOT and part throttle. It seems as though the problem is in the idle circuit, at least that is what I was thinking. It starts right up with throttle open, is this right, the handle is worn so I couldn't find the start position. Whats a good check to see if it is getting TO much fuel. IF I pull the plugs as seen as it stalls and the plugs are wet is this an indication. It will stay running in nuetral with a little throttle once the throttle cam comes in contact with the thingy on the fly wheel lol, yea I don't know the exat word....Oh yea I also learned how to rewind that spring on the recoil starter thats FUN!!

Any help would be greatly appretiated.

Thanks,
Chris

 

[oldcatamount]

Re: 1992 15 HP Evinrude no idling

Your compression numbers are great! Have you tried adjusting the needle valve (clockwise) a tad. 1 1/2 turns can be a bit much for idling.

 

[raczekp1]

Re: 1992 15 HP Evinrude no idling

hi.
i think this motor has idle set up screw at the end of twist grip(older moors had idle set up adjuster at RH lower motro cover), maybe just try to find best idle position by turning this screw.
i had some problems with head wraped, so at low speed just died-did flattening the head and new head gasket.
fuel delivery is coused by carb float-flat should be paralel.

my advice is to read articles writen by LeeRoy:http://www.sschapterpsa.com/ramblings/Johnson_9.9_carb-fuel_pump.htm

 

[ChrisAunchman]

Re: 1992 15 HP Evinrude no idling

Thanks that is good news about the compression...where is this idle screw.

Raczekp1 are you saying the idle adjustment is in the tiller handle? Also when I twist the tiller handle how long should it be before the throttle cam becomes depressed?

If it was a head warped issue wouldn't the compression be lower.

 

[oldcatamount]

Re: 1992 15 HP Evinrude no idling

With the compression numbers you have, the head isn't warped. At the very tip of the tiller handle, there is (I think) an idle/speed adjustment.

 

[raczekp1]

Re: 1992 15 HP Evinrude no idling

idle adjust by slow speed needle in carb.
but to synchonize this with ignition you set up with this adjuster in tiler handle(at the end).
carb cam should be just touched by igniction cam.
when motor gets warm,after few minutes head can lift a litle and compresion can be diferent.
check compresion after warming up

its good to instal new spark plugs also

 

[AlTn]

Re: 1992 15 HP Evinrude no idling

once the carb roller touches the timing cam...there should be no delay between twisting the throttle handle all the way to wot..if you are noticing a "delay" in the response from the tiller handle and the carb linkage opening the throttle plate...you may have some sticking issues involving the armature plate and its linkage to the vertical shaft...you can disconnect the arm from the top of the vertical shaft and the armature plate should move freely as you push/pull on this arm....the vertical shaft should move freely as you twist the throttle grip as well

 

[ChrisAunchman]

Re: 1992 15 HP Evinrude no idling

I'm not getting any delay once the carb roller comes in contact with the timing cam it is just you need to twist the handle quite a bit before that first contact. The label is worn off on the tiller handle, that is why was was asking about the poisiton of the tiller handle on starting as well.
I'm wondering, on this tiller handle is all the way counter-clock wise an OFF position? I noticed there is no "ENGINE KILL" button, like I have seen before.

 

[AlTn]

Re: 1992 15 HP Evinrude no idling

The switch you push your lanyard into is also the kill switch....to kill the motor you press in on that switch with the lanyard attached. The travel you see in the throttle handle is normal as long as the throttle plate is horizontal in the carb throat when the roller is at the highest point on the timing cam. The throttle position "label" I always took as "suggestions". Put it in neutral to start, twist the grip as far as the lockout will allow, choke it, and once it starts reduce the throttle back to idle. Same with gear selection..back to idle...shift firmly...an go.

 

[Cofe]

Re: 1992 15 HP Evinrude no idling

With the compression numbers you have, the head isn't warped. At the very tip of the tiller handle, there is (I think) an idle/speed adjustment.

Yes that is the idle speed adjustment. You can also use it to increase or decrease your trolling speed.

 

[ChrisAunchman]

Re: 1992 15 HP Evinrude no idling

SO the saga continues I tried to mess around with the idle knob at the end of the tiller handle and that seems like it worked a little. I think I have it all the way tight now. So another thing I tried this weekend was as it was dying at idle I tried to spray some fuel/oil into the throat of the carburator, it didn't seem to effect the fact it was dying. I did pull the plug imediately after it died and it was wet. I was thinking the plugs shouldn't be wet at all.....Now I did do a spark check on both coils and I'm getting a nice strong spark. I must say though after cleaning the carburator screwing the slow idle screw in and out makes a difference you can hear it in the motor. I did check the float to make sure it wasn't cracked and it would actually float.....What else would not make not make this motor idle. Someone mentioned to me it could be the crank seals...does thsi make sense? Oh yea it is an 88 not a 92.

Thanks,
Chris

 

[raczekp1]

Re: 1992 15 HP Evinrude no idling

wet spark plugs, but its fuel(smels like fuel) or water?
if its water then head gasket or water cover jacket is broken

 

[Cofe]

Re: 1992 15 HP Evinrude no idling

Chris I think we need to check your link and sync.
With the idle knob set all the way down, the carb butterfly needs to be closed. There is a adjustment on the tiller cable in the motor compartment, some have a ball on threads, and some have a threaded connector. Adjusting that will fine tune the adjustment for the idle knob.
With the throttle all the way down, the roller must be on the timing cam mark, the carb must be closed. The carb has linkage adjustments to make this work. You should be able to have the idle adjustment set all the way down, and as soon as you start to turn it clock wise, the carb will start opening up just a bit.

 

[AlTn]

Re: 1992 15 HP Evinrude no idling

do you have the plastic cover carb or the solid body carb?...boats.net or marineengine.com...have diagrams...did the motor ever idle well?

 

[ChrisAunchman]

Re: 1992 15 HP Evinrude no idling

I'm almost positive it is fuel.....smells like fuel. If I had a cracked water jacket wouldn't puff white smoke when turn up the throttle.

As far as the carb cover goes it is funny you mention that, I noticed the other day it had a small crack in it. I can feel it but it doesn't not look like it goes through. I hate spend the 78 dollars replacing one, if mine is alright. I don't see any cracks near the passages.

Now when the throttle on the tiller all the way down, it isn't even close to the timing cam. Should it be? I'm going to lok at the syncing tommorow night. Maybe that is way off. Is there a good procedure with pictures to reference?

V/r,
Chris

 

[AlTn]

Re: 1992 15 HP Evinrude no idling

the link raczekp1 provided in post #3 discusses these carbs as well as parts no. for a repair kit