30hp johnson smokes after extended idle

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The nozzle well gasket was placed on the card a month ago. Starts fine runs wot great, but after extended trolling or idle speeds (manatee zones, thump thump) it smokes like crazy for a 1/4 mile after restart.

after looking at a few diagrams I've noticed the Well gasket in the pics is a O-ring looking gasket. The one in my carb is a washer looking paperish gasket with interior notches.
Would this make a difference?

30JTEETA 93

Also below is a pic of the slow speed needle valve, I don't recall it being in so far but I took it to a shop cause I got tired of beating myhead against the wall when the original well gasket disapeared after a winter of storage, lol

 

[F_R]

Re: 30hp johnson smokes after extended idle

Yeah, you do have to do a lot of idle speed running there in Homosassa, don't you? Don't beat your self up over that smoke. ALL of the oil that you put in the gas goes through the engine. Some is burned (makes smoke) and the rest goes out the exhaust. At slow speeds, there isn't enough heat to burn off the exhaust, so it gets all oily inside. Then later, you generate some heat and burn that stuff off, and it smokes.

If you want minimize the smoke, use 100% synthetic TCW-3 oil. It also is bio-degradeable, which the manatees appreciate. And make sure your slow speed needle is set as lean as possible without sneezing.

 

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Re: 30hp johnson smokes after extended idle

 

[xtc_link]

Re: 30hp johnson smokes after extended idle

it doesn't exactly like to run at idle, Hmmm wonder if a video will link

 

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Re: 30hp johnson smokes after extended idle

 

[F_R]

Re: 30hp johnson smokes after extended idle

I dunno, I can't tell by listening to videos. But my immediate impression is it has a weak cylinder. May be wrong.

 

[xtc_link]

Re: 30hp johnson smokes after extended idle

interesting thought, I'll check compression

 

[Bosunsmate]

Re: 30hp johnson smokes after extended idle

interesting thought, I'll check compression

ive the 35 model and mine sounded exactly like that, the bottom cylinders wall by exhaust outlet was scored.
It didnt smoke though

 

[xtc_link]

Re: 30hp johnson smokes after extended idle

Attached pic is of top cylinder, bottom cylinder plug was covered in oil so the pic was identical except pressure was a pinch lower

 

[Bosunsmate]

Re: 30hp johnson smokes after extended idle

Wow thats pretty fouled, are they the right plugs? Ive the 35 and they run L77JC4 with a central electrode that sticks out and a side extended earth
Are you running it at 50/1mix?

 

[xtc_link]

Re: 30hp johnson smokes after extended idle

8oz on 3gal of fuel, those plugs were sooo clean b4 I ran it, LOL I understand there should be oil build up, but as you can see it looks a little excessive. I run champ QL77JC4.. I just threw in the NGK's for the day

 

[nwcove]

Re: 30hp johnson smokes after extended idle

Attached pic is of top cylinder, bottom cylinder plug was covered in oil so the pic was identical except pressure was a pinch lower
View attachment 141802

kinda hard to gap those plugs !

 

[xtc_link]

Re: 30hp johnson smokes after extended idle

kinda hard to gap those plugs !

the champs I had were wet like that so I threw those in and ran it for an hour

 

[Bosunsmate]

Re: 30hp johnson smokes after extended idle

So is it only the bottom plug getting oiled over?

 

[xtc_link]

Re: 30hp johnson smokes after extended idle

Both

 

[Bosunsmate]

Re: 30hp johnson smokes after extended idle

try adjusting slow speed fuel mix

 

[xtc_link]

Re: 30hp johnson smokes after extended idle

Any other thoughts b4 I set it back in the water?
I think I'm gonna take a timing light so I can observe the spark, pretty sure it's not a coil issue(but can't rule it out). In the video above it sounds like it misses at low speed

 

[Bosunsmate]

Re: 30hp johnson smokes after extended idle

Only to clean the plugs! keen to hear what happens.

 

[xtc_link]

Re: 30hp johnson smokes after extended idle

Only to clean the plugs! keen to hear what happens.

the 77jc's were installed after I checked compression this eve. I threw the NGK's away, lol not worth cleaning

 

[xtc_link]

Re: 30hp johnson smokes after extended idle

Adjusting slow speed mix seemed to clean up the smoke and wet build up on the plugs.
but it runs fast (faster then i'd like to engage the drive) and idles inconsistently. I'm gonna go threw the synchronizing part of the manual again.