5HP Johnson Idles Nice then dies after 5min full throttle

[remora]

Greetings,

New to boating. Picked up a nice little 5HP used as a kicker on a 15 ft; main engine is an Envirude 115. The 5HP starts and idles beautifully, but when using it, it begins to lose power after about 3 to 5 minutes then cuts completely off as if someone stopped the gas flow. I then hear a gurgling sound. After a few minutes I can restart again. The valve on the portable gas tank (6 gallon) is open all the way so I know it's not the tank or fuel line - plus I use the same tank and fuel line on the 115 w/o problem. Another curiosity, when I'm bottom fishing in the ocean, bobbing in the water, I hear a squeaking sound coming from the 5hp Johnson as it bobs in the water w/o it running.

Any thoughts would be greatly appreciated. I believe it is a 2000 model but I may be mistaken.

Thank you,

George

 

[tashasdaddy]

Re: 5HP Johnson Idles Nice then dies after 5min full throttle

is it running hot? have you tried squeezing the bulb when it starts to die?

 

[ho_shi]

Re: 5HP Johnson Idles Nice then dies after 5min full throttle

i have that same problem untill i relized i forgot to open the air vent on the top of the gas tank, make sure its not plugged

 

[samo_ott]

Re: 5HP Johnson Idles Nice then dies after 5min full throttle

It does sound like an air vent restriction problem but if its the same tank as the 115 then it does not make sense.

 

[mikesea]

Re: 5HP Johnson Idles Nice then dies after 5min full throttle

The Gurgiling Sound Does Indicate Probable Overheat As Tash.mentioned.you Can Heat Seize The Eng .then It Frees Up After Cooling.if Not Already,damage Will Occur If Thats The Case,be Certain Its Running Cool,can You Put Your Hand On The Head When Its Running,if Its Overheating It Will Be Too Hot To The Touch,the Gurgling Is The Boiling Of Any Water Getting To The Hot Eng.all Engines Should Have Impeller Changed Yearly,especially Small Ones That Have Small Mass Of Material

 

[TN-25]

Re: 5HP Johnson Idles Nice then dies after 5min full throttle

Perhaps a sticky float or gas-logged float. Maybe there is some gumming from old residual fuel left in the carb during storage, or perhaps even the tank.

Perhaps the motor is running hot. If so there might be a vapor lock in the fuel line under the hood (doubtful but check it).

You did check for water coming out of the tell-tale (pee-hole) when running, right? If you don't know if the impeller has been changed, I recommend it as a good thing to replace to ensure long-term durability and reliability. If the impeller is toast then it can totally smoke your motor. Initially your motor might start to seize from overheating, then can un-seize after a cool down period. This is dangerous to your motor!

3-5 minutes isn't long enough for a coil to peter out normally, but if you are running it a WOT it might.

What plugs are you running? If you are trolling, make sure the plug is in a hot enough range; if you are running it a WOT make sure the plug is in a cold enough range. Plugs see a lot of abuse and are relatively cheap, so try replacing them with the appropriate ones for your intended use.

 

[remora]

Re: 5HP Johnson Idles Nice then dies after 5min full throttle

Thank you folks for your replies.

Most of the questions I can't answer as I'm a newbie and the previous owner gave limited info. I'm not sure if and when the impeller was changed. I will do so. I'm not sure about the over heating, I will check that this weekend when I run it. I haven't tried the bulb when it dies to see the consistency of it. Again, this is my first boat so I'm learning.

The tank vent was the first suggestion given to me but it's wide open and I changed tanks too. No luck. Again I run the 115 with the same line w/o issues.

The real weird thing is when it's off and I hear a tinny, squeaking sound as the boat bobs in the ocean. Even if I never ran the 5hp.

Another weird thing I found today when I took off the cover and peaked around, there's a thin cylindrical piece which is on the bottom of the engine cover that seems to have fallen off of something. It looks like the stem on the outlet of a compressor like the ones to fill a soccer ball with. Next to it is a small, long spring that I'm guessing goes with it. Perhaps this is part of my issue. I can see that it's not as simple as I thought and thus should find a mechanic. I worry about running in the ocean with only one engine.

Thanks again for all your advice!

Take care,

George

 

[lyncraft_mechanic]

Re: 5HP Johnson Idles Nice then dies after 5min full throttle

is there anyway that you can post a pic of the parts you found, I'm sure that one of us can help identify your problem. I use Photobucket.com to upload all of my pics!! if not maybe you can identify the parts from this website http://www.shop.evinrude.com

 

[samo_ott]

Re: 5HP Johnson Idles Nice then dies after 5min full throttle

I was going to say the same. Post a pic if you can. The more the better

 

[remora]

Re: 5HP Johnson Idles Nice then dies after 5min full throttle

Here is a picture of the parts I found floating around inside. Not sure what they do. Any help would be appreciated.

I haven't been able to go out to try other suggestions but maybe later today.

Thanks,

George

 

[F_R]

Re: 5HP Johnson Idles Nice then dies after 5min full throttle

I'm not sure what the parts are, but I wonder if the sound you hear could be a whistle as the water rises and falls in the underwater exhaust column as it bobs up and down. That would make air blow and suck through the above water exhaust relief as it does so. Just a thought.

 

[samo_ott]

Re: 5HP Johnson Idles Nice then dies after 5min full throttle

Where exactly did you find those parts? rolling around in the bottom of the cowling? They do not look familiar.

 

[CharlieB]

Re: 5HP Johnson Idles Nice then dies after 5min full throttle

Looks a lot like the plunger and spring for a fuel valve, like an enrichener.

 

[Xcusme]

Re: 5HP Johnson Idles Nice then dies after 5min full throttle

Remora, Can you post the model numbers for this motor??

 

[remora]

Re: 5HP Johnson Idles Nice then dies after 5min full throttle

I ran the motor again yesterday and when it died, the bulb on the fuel line from the portable tank was still firm. The engine was not hot.

Model Number: J5RLSI SN:15018167

I talked with the gentleman I bought it from and he only used it as a kicker. He would run it after each trip to flush it out with fresh water and salt away. He only used it twice for a "long trip" when his main engine died. Never had this same problem.

Any further ideas?

Thanks!

George

 

[Vic.S]

Re: 5HP Johnson Idles Nice then dies after 5min full throttle

Go to The Shop.Evinrude.com parts catalog find your engine and look at the parts diagrams and see if you can ID those parts. I cant!

Its a 2001 model, BTW. SI are the date letters for 2001

You say the bulb was still firm (that's a bit odd I'd expect it to go a bit soft) but did you do as suggested and try pumping it?

Do you have an internal tank as well as the portable. If so does it run Ok from that.

Fuel filter OK?

Is there a problem with the valve that switches between tanks?

Is there possibly an air leak on the portable tank connector to the engine.

Is this to stupid to suggest. You are not switching to the portable tank, you are running from the internal tank but you have not opened the vent on that. (Gurgling caused by air being sucked back into that from the carb and also explains why the fuel bulb is staying firm)

No, on studying the diagram of the fuel system that wont explain things unless the in line filter in the hose from the remote tank connector is blocked.

I feel sure the problem is somethingto do with this fuel system though. Are you sure you are operating the tap (it is just a tap and filter)on the internal tank outlet) correctly. It must be shut to run on the remote tank.