Evinrude Smokes, black wet spark plugs

[cadriver]

Newbie here!
Can someone help me with two different Evinrudes, one is a 92- 9.9hp two stroke, the other one a 73- 18hp two stroke also.

I'm new to boating and outboards but I'm good fixing cars, these motors run
OK I guess, but I'm not sure if they should smoke a lot especially when running
at full throttle in the big water tank, my experience as a car mechanic is telling me something must be wrong, because there's a thick layer of black oil in the test tank, and plugs are all wet and black.

The motor starts fine, but that big cloud of smoke worries me, I had rebuilt the carb of the 9.9, and a new fuel pump and that didn't stop the smoke or the oil on top of the test tank?
I'm a bit confused with the mixing of 50-1, I have a small 3 gallon gas tank
and I mixed 8 ounces of oil for 3 gallons is this correct?

Anyway, the worst part is both motors are having the same exact problem, or maybe it's just normal to smoke and have wet black spark plugs on these 2 strokes?

The way I see it, it's running super rich if I were working on a car, but these are 2 stroke outboards and I have no idea how they should work, they both idle ok, with some hesitation, and power is up, but the smoke and the smell of fuel ol over my clothing doesn't looks right to me, maybe the pros here can share some info?

Thank you.

 

[tashasdaddy]

Re: Evinrude Smokes, black wet spark plugs

you mix is almost perfect 1/2 ounce too much, are you using TCW-3 outboard oil, the synthetic TCW-3 smokes less. if not that is causing smoke. they are 2 cycle motors some of the oil gets burn (the smoke) some just lubricates, and expells out the exhaust, that is what you see in the tank. did you use a rebuild kit when rebuilding the carbs. some carbs have hidden fixed jets. the others are adjustable. here's a simple link for the oil mix, and carb adjustments. http://www.rctek.com/pdf/fuel_to_oil_ratio_chart.pdf

http://www.iboats.com/bbboard/bbBoard.cgi?a=viewthread;fid=28;gtid=818798;gpid=818802

if the plugs are black and wet, you are too rich, and not getting a clean burn. plugs should be light brown and dry.

 

[F_R]

Re: Evinrude Smokes, black wet spark plugs

Your motors sound fine to me. They are supposed to smoke. As already said, some of the oil burns (smoke) and some goes out the exhaust (scum). You can't do a decent job adjusting carbs in a tank. Put them on a boat in the water and see a big difference.

Car oil is used over an over, gets black and dirty and has to be changed. Outboard oil is used only once, so is always new and clean. The black crud is after it has gone through the engine and has been discharged into the exhaust where it picks up black carbon particles.

Spark plugs may be oily one minute and dry the next depending on load, throttle, temp, and a bunch of other variables. If they ain't broke, don't fix them.

 

[cadriver]

Re: Evinrude Smokes, black wet spark plugs

It looks to me like both outboards are running too rich, the wet spark plugs with some black oil draining out of the spark plug hole doesn't look right to me,
in both motors I used the same prime bulb, I squeeze it till hard than I crank the motor, can a defective prime bulb make the motor to run rich?
I've been thinking that oil in spark plugs could be unburned oil not the gas,
but how can I be sure?
After shutting down the motor it drips a good amount of this black oil to the ground from the exhaust, not just a few drops, but more like an ounce or two
of a thick black grayish stuff, and it's not the gear oil, the gear oil is clean no leaks.

I rebuilt the carb with a new kit , I adjusted the float, and vacuum pump the float to make sure it's opening and closing, and everything looked OK!

Anyway my big concern is wet spark plugs coated with oil?
What else can do this besides a bad carb?
I just don't understand how can both motors have the same issue.
You guys think something must be wrong with gas tank prime fuel line?

Thanks again................

 

[cadriver]

Re: Evinrude Smokes, black wet spark plugs

=tashasdaddy;1344734] are you using TCW-3 outboard oil, the synthetic TCW-3 smokes less. if not that is causing smoke.

Yes I used TCW-3

did you use a rebuild kit when rebuilding the carbs. some carbs have hidden fixed jets. the others are adjustable. here's a simple link for the oil mix, and carb adjustments.

Yes I used a new rebuild kit, I know how to adjust carbs, these aren't any harder than VW bug Solex Carbs to work with.

if the plugs are black and wet, you are too rich, and not getting a clean burn. plugs should be light brown and dry.

If you were talking about a car yes but a motor that burns oil with gas in 2 stroke impossible to have sparks brown or tan like in your car.

 

[ezeke]

Re: Evinrude Smokes, black wet spark plugs

Both motors will generate a lot of smoke if they are run cold.

Synthetic TCW-3 oils help a lot, not a little.

Unless you are running with a test prop, you should not run your motors over 1500 RPM because the risk of ruanaway is much higher with 2 strokes. You need to get a load on the engine for it to perform properly anyway.

On my motors, it seems the longer I go without doing a full de-carbon, the worse the smoke and plug fouling becomes.​

 

[Gary H NC]

Re: Evinrude Smokes, black wet spark plugs

My Johnson 175 blows a big cloud of white smoke at start up.Once its warmed up no smoke at all. I just think its the nature of the beast!

 

[F_R]

Re: Evinrude Smokes, black wet spark plugs

Still think the spark plugs are broke and need fixing huh? You put OIL in the gas. It goes through the combustion chamber and some burns, some doesn't. What is left gets all over everything in there, cylinder walls, cylinder head, SPARK PLUGS. Spark plugs will more or less dry off with higher speeds and combustion temps. But they will oil up again with return to idle. It's the nature of the beast. It ain't a car.

I could tell you something about that '73-18hp concerning excess oil, but don't want to confuse the issue. Matter of fact I could tell you something about the 9.9 too.

 

[cadriver]

Re: Evinrude Smokes, black wet spark plugs

=imported_F_R;1345254]Still think the spark plugs are broke and need fixing huh?

No,No, the spark plugs are Ok but they come out dripping wet in black oil.

I could tell you something about that '73-18hp concerning excess oil, but don't want to confuse the issue. Matter of fact I could tell you something about the 9.9 too.

PLEASE DO, I want to read about!!!!
If these motors are a piece of junk I want to hear about, go ahead tell me the goods and bads on these Evinrude.
Thank you.....

PD: These motors can start right up even with the spark plugs soaked in oil.
Motor smokes in water tank all the time even after 15 minutes or so running in the tank it does not smoke when idling but if I open the throttle in gear at WOT, the smoke show gets the attention of my neighbors.
I'm running the motor with a regular propeller, and i think it's under load because is throwing water ol over the place, I could be wrong?

 

[Gary H NC]

Re: Evinrude Smokes, black wet spark plugs

Nothing like the smell of two stroke in the morning...aahhh! Gets me excited!

Don't worry,those are great old motors...

 

[cadriver]

Re: Evinrude Smokes, black wet spark plugs

Nothing like the smell of two stroke in the morning...aahhh! Gets me excited!

Don't worry,those are great old motors...

Funny!!
But serious, the smell of this much smoke can really make you sick, I guess when
you riding the boat the wind blows the smoke back behind you, like I said before I'm new to boating and outboards, but I love fishing, and I want to go where the fish is, too bad these outboards are so big in pollution, especially the oil they drain into the water.

 

[F_R]

Re: Evinrude Smokes, black wet spark plugs

Smoke is normal. You won't notice it nearly so much if you get it out of that barrel and put it on a boat. Try me on this.

You are concerned about the oil in the waterways. So are a lot of other people. That is why mfrs started around 1973 to do something about it. Your 18 takes oil that previously was deliberatly dumped overboard and routes it into the cylinder for burning. That's the little hose you see on the side. But it doesn't run as well with that extra oil and gas going into the cylinder and smokes more, and fouls plugs more. As for the 9.9, early ones gave a pile of trouble with fouling plugs and misfiring, but yours should be OK.

If you really care about the water pollution and smoke, use 100% Synthetic TCW-3 oil. It's bio-degradeable and smokes a lot less and cost's more. But you still gotta get it out of that barrel. They were made to run on a boat, not a bucket.

 

[cadriver]

Re: Evinrude Smokes, black wet spark plugs

Smoke is normal. You won't notice it nearly so much if you get it out of that barrel and put it on a boat. Try me on this.

You are concerned about the oil in the waterways. So are a lot of other people. That is why mfrs started around 1973 to do something about it. Your 18 takes oil that previously was deliberatly dumped overboard and routes it into the cylinder for burning. That's the little hose you see on the side. But it doesn't run as well with that extra oil and gas going into the cylinder and smokes more, and fouls plugs more. As for the 9.9, early ones gave a pile of trouble with fouling plugs and misfiring, but yours should be OK.

If you really care about the water pollution and smoke, use 100% Synthetic TCW-3 oil. It's bio-degradeable and smokes a lot less and cost's more. But you still gotta get it out of that barrel. They were made to run on a boat, not a bucket.

Well, don't get me wrong I'm not a tree huger but the oil that drips on the floor is more than a few drops, and let me ask you why the oil comes out so thick like a black cream?
Here's a pic of the motor.
Click to enlarge.

 

[cadriver]

Re: Evinrude Smokes, black wet spark plugs

Your 18 takes oil that previously was deliberatly dumped overboard and routes it into the cylinder for burning. That's the little hose you see on the side. But it doesn't run as well with that extra oil and gas going into the cylinder and smokes more, and fouls plugs more.

You're right!
I found that small hose, should I remove it and plug the small nipples? It might help with the smoke if that's the case?

 

[F_R]

Re: Evinrude Smokes, black wet spark plugs

Remember the cars of the '70s? Everybody yanked out all the anti-smog stuff, saying we don't need that. And it wound up running worse than it did before. I know, I did it myself.

A lot of motors got that hose nipple soldered shut and the hose stuck back on so it looks unmolested. Does it really help? Well-l-l-l, maybe just a tad, but no real difference in the smoke in a barrel. But then the oil just puddles in the crankcase at idle and blows through in a big blast when you open the throttle. Older motors, before the hose, just dumped the stuff directly overboard. Out of sight, out of mind. At least till you notice the purple rainbow oil sheen clear across the river. But they ran a lot better.

 

[cadriver]

Re: Evinrude Smokes, black wet spark plugs

A lot of motors got that hose nipple soldered shut and the hose stuck back on so it looks unmolested. Does it really help? Well-l-l-l, maybe just a tad, but no real difference in the smoke in a barrel. But then the oil just puddles in the crankcase at idle and blows through in a big blast when you open the throttle. Older motors, before the hose, just dumped the stuff directly overboard. Out of sight, out of mind. At least till you notice the purple rainbow oil sheen clear across the river. But they ran a lot better.

That's funny how you said it!

I'm going to use this motor in the ocean, Baja Mexico to be exact, now this hose you're talking about is a tiny 1/8 thick that runs from the intake to the upper cylinder?
It's weird there's no hose for the lower cylinder, so you're sure removing the hose won't hurt the engine, and about the oil going in the water, is already bad as is , BTW, you never comment about the spark plugs been soaked wet in oil, is it normal on this motor, I have the same exact thing with the newer 92 model 9.9, are you sure I'm not having a rich mixture issue?

Thanks again.

 

[F_R]

Re: Evinrude Smokes, black wet spark plugs

That's the hose. It won't hurt the engine. Probably won't help much either. I thought I had made it clear about the plugs. Don't worry about them.