Will not idle down

[GILBOMAN2002]

1982 Johnson 140 V4. Not sure if the throttle linkage is set right or idle screw not right. Where's a good start ? On the dock I can get it to idle, but run around the lake and stop and put into neutral engine idles way to high

 

[oldboat1]

sounds to me like an issue with the throttle cable. At the dock, remove the throttle cable at the engine, and operate the engine manually -- see if you get it to idle. If so, adjust the cable to match the engine linkage, and reattach. Seems the idle screw setting would have the same effect on the dock and out on the water.

 

[Joe Reeves]

sounds to me like an issue with the throttle cable. At the dock, remove the throttle cable at the engine, and operate the engine manually -- see if you get it to idle. If so, adjust the cable to match the engine linkage, and reattach. Seems the idle screw setting would have the same effect on the dock and out on the water.

In agreement with the above.

 

[GILBOMAN2002]

Ok . Ill give it a try . Thanks

 

[GILBOMAN2002]

Thanks for the info. I did as instructed and got it to idle, but idled kind of rough. Like a slow 123 cough 123 cough. Sprayed some Seafoam into the carbs and the cough went away when I sprayed into the top two carbs. Eventually the cough went away and put everything back together then took the kids out tubing. My brother was surprised when we pulled up to the dock on how good it idled. Took the boat out later to go fishing and the cough was back. Something stuck in the top carbs ?

 

[flyingscott]

Carbs are probably dirty need a good dis-assembly and cleaning

 

[Joe Reeves]

*copy/paste (Something stuck in the top carbs ?)

That's normally caused by a slow speed "Air Bleed" jet that's a size too large. Look closely inside the carburetor throats... at the top inside front portion of the throats. You'll see a small jet screwed into each barrel. Those are the idle "Air Bleed" jets... take notice that they measure air, not fuel... SO if a engine cylinder is running lean it would require installing a smaller jet to restrict the air flow in order to force more fuel to that cylinder.

Now, when the engine's coughing, stick your finger over one of those jets (acting as a manual choke), to find which cylinder is running lean... the engine would smooth out somewhat when you cover/restrict the faulty jet with your finger. You would then know which slow speed jet to replace with a smaller size.

The size is imprinted on the face of the jets. Let us know what you find.

 

[GILBOMAN2002]

Ok . Thanks. Will give it a try