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Oily Gunk

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chancewane
Deckhand

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USA
17 Posts

Initially Posted - 08/25/2004 : 18:59:26

After motoring back to my slip, about 1 1/2 hours, I noticed that there was oily gunk on the fin below where the exaust comes out of the 9.9 Johnson 2 stroke motor.

I have no idea how old or how many hrs. on this motor. Is this bad omen, or did I mix the fuel wrong? I mixed it 50:1 per the instructions on the tank. Is it normal to have oil unburned coming from the exaust port? Is this a good excuse to purchase that 4 sroke Honda I was recently offered?

Chance

Chancewane
1978 C25 FKSR #744

Edited by - on

atgep
Master Marine Consultant

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1009 Posts

Response Posted - 08/25/2004 : 19:35:43

Completely Normal for this motor. I can only figure is is because of the shaft lenght. I know the 15 in models do not do it. I suspect because of the shaft length, the exhaust cools to the point that oil sticks.
And yes is is a great reason to buy a 4 stroke!

Edited by - on

Ben
Master Marine Consultant

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USA
1234 Posts

Response Posted - 08/26/2004 : 08:06:05

Chance, I posted this exact same question last year when I saw the same oily stuff on my fins. Funny, my local mechanic said it was a really bad thing that could cost hundreds of dollars, but a bunch of great folks on this site said it's normal and to leave it alone. I did what the experts recommended. I've been using the heck out of it since with no problems. Oh yeah, my engine is an 86 or 87 Johnson Sailmaster 2 stroke.

Edited by - on

aeckhart
Master Marine Consultant

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USA
1709 Posts

Response Posted - 08/26/2004 : 10:07:38

You mention that you mixed your gas according to instructions on the tank. Do you use an independant gas tank? What year is your motor manufactured? My 1989 Evinrude 9.9 hp is a 100:1 mix according to the owners manual. I also have a 1988 8 hp Evinrude which also a 100:1. The mix on the fuel tank may not be correct for your motor. Since Evinrude and Johnson were made by OMC, you may want to check the owners manual.

I think the only repercussion of too much oil in the mix is carbon buildup, particularly on the spark plugs. This of course could lead to engine stalling at the most inopportune time. My worst nightmare is entering a marina with lots of very expensive yachts and running into one because my motor has stalled and I've lost steering control.

Anyway, for what it's worth.

Al
GALLIVANT #5801

Edited by - on

JimB517
Past Commodore

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USA
3285 Posts

Response Posted - 08/26/2004 : 11:13:16

Always keep the mainsail ready to hoist in a pinch until you are tied up in the slip. I practice sailing into my slip frequently, and regularly sail all around the boats in the anchorage. Also, if possible, motor on the upwind side of jettys and leeward of obstacles so that if you have a motor failure you'll have time to get that main up without drifting down on an obstacle that is only a few feet to leeward. Keep an anchor ready to deploy within a minute at all times.

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MattL
Admiral

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USA
990 Posts

Response Posted - 08/26/2004 : 11:57:47

I am fortunate in that I can sail into my slip. I do keep the motor running incase I need to use it as a break if I'm coming in a little too hot.

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chancewane
Deckhand

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USA
17 Posts

Response Posted - 08/26/2004 : 12:36:32

Ben,

Mine is a Seamaster 9.9 and don't know the year model. Probably mid to late eighties by the looks of it. The independent 3 gal tank says OMC on it. I will try research using the serial number to determine the correct mix. More oil is better than less, though, except for fouling of the plug. I think I will also keep a new plug aboard and listen to the motor to determine if a miss indicates fouling.

Chance

Edited by - on

chancewane
Deckhand

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USA
17 Posts

Response Posted - 08/26/2004 : 12:38:23

Al,

Mine is a Seamaster 9.9 and don't know the year model. Probably mid to late eighties by the looks of it. The independent 3 gal tank says OMC on it. I will try research using the serial number to determine the correct mix. More oil is better than less, though, except for fouling of the plug. I think I will also keep a new plug aboard and listen to the motor to determine if a miss indicates fouling.

Chance

Edited by - on

atgep
Master Marine Consultant

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1009 Posts

Response Posted - 08/26/2004 : 19:09:38

Around 1987 or so they went to a 100 to 1 mix. It was nice, but OMC had lots of problems with siezed engines and put out a notice to go back to 50-1. You could call a dealer and verify of coarse. 100-1 is only an issue if you run at high rpms often. I suspect most of us do not. Here is a site to help with the 70's and 80's versions. I would trade my soon-to-be-boat-anchor 96 sailmaster in a hearbeat. It is a real Yugo compared to the earlier ones.

http://www.pugetsoundanglers.org/Fishing%20Info/Johnson%209.9_15.htm

Tom.

Edited by - on

Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts

Response Posted - 08/26/2004 : 19:13:51

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by atgep
 Around 1987 or so they went to a 100 to 1 mix. It was nice, but OMC had lots of problems with siezed engines and put out a notice to go back to 50-1. You could call a dealer and verify of coarse. 100-1 is only an issue if you run at high rpms often. I suspect most of us do not. Here is a site to help with the 70's and 80's versions. I would trade my soon-to-be-boat-anchor 96 sailmaster in a hearbeat. It is a real Yugo compared to the earlier ones.

http://www.pugetsoundanglers.org/Fishing%20Info/Johnson%209.9_15.htm

Tom.
<hr height="1" noshade id="quote"></blockquote id="quote">

excellent post

Edited by - on

ClamBeach
Master Marine Consultant

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3072 Posts

Response Posted - 08/26/2004 : 19:44:05

Using a clean-burning synthetic oil helps too...

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chancewane
Deckhand

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USA
17 Posts

Response Posted - 08/26/2004 : 23:06:22

Tom,

Thanks for that great item, I saved it for future reference.

Steve

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