15hp Johnson 2 cycle 92

[Lisas4]

I have a 1992 15hp Johnson. It starts right away, idles, but does not provide force. Comporession fine, spark fine. When I restrict the fuel supply by pressing on the fuel hose shortly before stopping it produces grerat force. When i restrict it so much that it is just getting enough fuel the dingy starts to glide.
My opinbion is, that it gets to much fuel, spark plugs are as well black.
But the carburator has only an idle screw.

What could be the problem and what can I do to solve it?

 

[david_r]

Re: 15hp Johnson 2 cycle 92

it sounds to me you need to rebuild or clean your carb.

has this motor bean sitting for a while?

when you say force do you mean prepulsion? that it starts to go forward?
sorry dont know if i spelled that right

 

[tashasdaddy]

Re: 15hp Johnson 2 cycle 92

how are you restricting the fuel? your post is hard to follow.

 

[iwombat]

Re: 15hp Johnson 2 cycle 92

Sounds like maybe you need to reset your float. Might as well do a full carb rebuild while you're at it.

But, I agree a better description would help.

 

[Lisas4]

Re: 15hp Johnson 2 cycle 92

[I restict the fuel by squezzing the fuel hose.

Yes, it gets propulsion when it gets less fuel, is funny , isn't it.

 

[tx1961whaler]

Re: 15hp Johnson 2 cycle 92

Were you actually closing the fuel line, or squeezing the primer bulb that is in the fuel line?

 

[Lisas4]

Re: 15hp Johnson 2 cycle 92

Were you actually closing the fuel line, or squeezing the primer bulb that is in the fuel line?

I was closing the fuelline. I was not squeezing the primer bulp.

 

[david_r]

Re: 15hp Johnson 2 cycle 92

when you get ready to clean/rebuild the carb make sure you clean every orifice you can find very well. theres nothin more agravating than pullin your carbs off after you thought you just cleaned them and are ready to fish!

good luck!

 

[Lisas4]

Re: 15hp Johnson 2 cycle 92

I put a piece of wire into the little jet screw in the bottom of the caborator to reduce fuel intake, and ther engine runs fantastic now.

Funny, that nobody of you guys had anything concrete to say about to much fuel.

I am a bit disappointed I must say.

 

[tx1961whaler]

Re: 15hp Johnson 2 cycle 92

Yes, it will run fantastic till the pistons melt from too lean of a mixture.
You were advised to rebuild the carb, and that is still the advice to properly fix the motor. Sticking a wire in the jets is not fixing anything because the air passages in the carb are clogged.

 

[CatTwentyTwo]

Re: 15hp Johnson 2 cycle 92

What is it that JB says? Premeditated negligence or something.