15hp johnson just died

[rosgood14]

Re: 15hp johnson just died

ok so i have had the cover off the entire time while running the motor trying to fix it and im sorry if i was a little sarcastic but im starting to get tired of this problem that cant seem to be fixed. also i do not see any little red lever and i dont even know what the primer solenoid looks like so a little description would be great. as far as the exhaust issue is what the mechanic was saying is that the grommet at the base of the powerhead is a grommet that hooks into the exhaust tube i believe that when the motor gets hot it on rare occasions can close up and he is saying that it may have slightly closed and that when the motor is at idle or medium throttle it is enough for the exhaust to get through but when you open the motor up it is not a big enough hole for all the exhaust to get out so its bogging out the motor. now that makes sense to me plz tell me if it is a load of crap because i really dont want to tear it all the way down just for a 5 dollar part and it not be it. thanks for all your time and efforts in trying to help me even if im a little sarcastic at times.

 

[AlTn]

Re: 15hp johnson just died

little commonsense into play here....the exhaust for a 15 hp. 2 stroke is surely going to require an exit area much larger than a grommet could provide...I went to the diagrams at marineengine.com looking for a 1995 15 hp. johnson model no. J15REO..closest I could find is a J15REOD..if that 's the correct model no...look at the diagrams and you'll see that there's no exhaust grommet...there's a water tube intake and a water tube exit grommet..and a powerhead to base gasket. No very likely at all that your exhaust would get so resticted that it would cause the symptoms you describe.
Even though you've replaced the coil and powerpack you could still have an intermittent spark issue. If you'll try the timing light on each plug wire you can quickly confirm or eliminate this as a concern..then go on to the fuel delivery area.
What's "good" compression?...got a firm number?..it can at least be used as a baseline for test on down through the years.
Post back the results of these 2 test and move forward...frustration is just part of it...to be offset by "well hale..it's actually running right."

 

[fireman57]

Re: 15hp johnson just died

I assume that you ran the engine with the cover off and it did the same thing. you never said what happened. The primer solenoid is a round black contraption that looks kind of like an old film canister. It should be located at the bottom front left of your engine when you are looking at it from inside the boat. This replaced the old choke system. On a cold start the lever gets flipped one way and when it is running you have to flip it back or it will run horribly and idle and flood out at high speeds. You say you don't know what these things look like but there are diagrams available online that will show you. I still don't know why you won't post results of the tests that people ask you to perform. You just say that this and that is alright. That really tells us nothing. I also cannot trust your so called "evinrude/johnson" mechanic.

 

[rosgood14]

Re: 15hp johnson just died

ok so here is a brain teaser. i have been looking for this primer solenoid that yall keep talking about and i have not been able to find it so like yall said i went to marinengine.com and found a picture so i went back to look again positive that i have not seen anything like it. however knowing what i was looking for i found a round spot that has two screw holes where it mounts but it has not been there since i have had the motor and it ran fine before without it. so i dont know if this has anything to do with my issues or not. thanks

 

[fireman57]

Re: 15hp johnson just died

If it has been removed then it is not an issue. How did you start it cold before without it on? You still have not said whether you ran it with the cover off at WOT and what it did. "ok so i have had the cover off the entire time while running the motor trying to fix it" does not make any sense. I didn't say leave it off and running while you were trying to fix it I said run it with the cover off and if it does the same thing then it is not your exhaust gasket. It sounds like you still haven't taken a buddy and a timing light out to check for loss of spark at WOT. You just said that you replaced coils etc... The coils you buy now you have to put together yourself and it is sometimes hard to get the wires seated properly on the pin. You could have a bad connection in there and you would lose spark when it is needing it most. When you ask a question and someone comes up with an easy legitimate test for it please perform that test and let people know the results. You admit that you don't know much about these engines but you seem to dismiss out of hand any tests to do because in your mind that can't be the problem. These guys have seen just about everything and when you refuse to do a simple test then they will end up leaving your thread and you will still have your problem.

 

[lifeboat]

Re: 15hp johnson just died

hay man, sounds like the problem I had a while back . A linkage rod came loose that is on the timming plate under the flywheel.The other end of it goes to the carb. When I tryed to speed up it would bog real bad cause it was not changing timming as I throtteled up.

 

[AlTn]

Re: 15hp johnson just died

the primer is only for the electric start models, I think...do you have the choke that pulls on and pushes off..or do you pull a lever and it "pumps" some fuel into the intake when you pull it?

 

[fireman57]

Re: 15hp johnson just died

AlTn I have a government issued 25 and it has the pump that you are talking about. It's a '93 and has a gold hood. I had never seen one like this and I wonder if the pump is only on government engines. It works great and almost idiot proof. I know because I is one.

 

[AlTn]

Re: 15hp johnson just died

yeah...some type of manual primer and electronic ignition sure made starting small 2 strokes less "stressful"...those old model mcculloch chain saws would try the patience of a saint