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#4184011 - 08/22/16 08:46 PM 1977 Evinrude 15hp
mjk Offline


Registered: 02/15/11
Posts: 1233
Loc: Wishin' I was in Wi
Picked up a Jon boat today. 2 questions:

a. what are the preferred plugs for these? Guy I bought it from likes Champion, never have run them before. Also, what is the part #?

b. Any harm running Amsoil 2 stroke oil through it? Just wondering if a full syn oil, on an older outboard, would cause issues. Otherwise, I have Mag 1 TCW3.

Thanks.

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#4184019 - 08/22/16 08:55 PM Re: 1977 Evinrude 15hp [Re: mjk]
Vern_in_IL Offline


Registered: 06/25/14
Posts: 1889
Loc: IL
If I recall, the early models of the 9.9/15hp had a problem with the cylinder head design, and OMC came out with an improved head to be retrofitted to those motors.

I'd say anything in an 80's-and-up vintage is a pretty decent motor. When they're run a lot in salt, they have issues with the rubber upper water tube grommet squeezing shut, then you lose cooling. The 6, 7.5, and 8hp models (starting in the 80's) have the same problem.
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#4184029 - 08/22/16 09:07 PM Re: 1977 Evinrude 15hp [Re: mjk]
stcif Offline


Registered: 09/28/14
Posts: 56
Loc: NY
I have a 1984 Evinrude 15 HP electric start. I use Champion plugs and the motor runs great. As for the oil I have been using Pennzoil so I have no expertience with Amsoil. I would think a synthetic would be fine though.

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#4184074 - 08/22/16 09:47 PM Re: 1977 Evinrude 15hp [Re: mjk]
Rand Offline


Registered: 08/20/03
Posts: 12651
Loc: NE,Ohio
anything tc-w3 is fine.
Plugs I've used several all worked fine.

Might want to check out the carb and jet.





Edited by Rand (08/22/16 09:52 PM)
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#4184107 - 08/22/16 10:38 PM Re: 1977 Evinrude 15hp [Re: Vern_in_IL]
mjk Offline


Registered: 02/15/11
Posts: 1233
Loc: Wishin' I was in Wi
Those are pre- 77 motors. In 77, they went to CDI ignitions. I had read about the issue you are pointing out.

BTW, where did you copy/paste that info from? I read it earlier in the night.

Originally Posted By: Vern_in_IL
If I recall, the early models of the 9.9/15hp had a problem with the cylinder head design, and OMC came out with an improved head to be retrofitted to those motors.

I'd say anything in an 80's-and-up vintage is a pretty decent motor. When they're run a lot in salt, they have issues with the rubber upper water tube grommet squeezing shut, then you lose cooling. The 6, 7.5, and 8hp models (starting in the 80's) have the same problem.


Edited by mjk (08/22/16 10:40 PM)

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#4184149 - 08/22/16 11:33 PM Re: 1977 Evinrude 15hp [Re: mjk]
Johnny2Bad Offline


Registered: 05/20/13
Posts: 1810
Loc: Saskatchewan, Canada
NGK in all my marine motors, 9.9 to 90 HP, 2 stroke and 4 stroke. But if I were looking at using something different, the last place I'd look for plugs would be the Champion catalog.
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#4184171 - 08/23/16 12:29 AM Re: 1977 Evinrude 15hp [Re: mjk]
bvance554 Offline


Registered: 09/24/12
Posts: 2191
Loc: VA
I love old outboards. I don't know if it just reminds me of my youth and fishing with my Dad or what. Or maybe it was that old Seahorse that he had. I don't know what year it was, but it was old in 1980. I think I just liked the looks of it. Ran great. These things are easy to work on, and it will never hurt to check the jets as mentioned above. I've seen some nasty old carbs, and it wasn't the fault of ethanol. Does the motor have plugs in it? Is there a number? I'd use any TCW3 oil and not waste my dough on Amsoil. Have fun.

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#4184201 - 08/23/16 02:08 AM Re: 1977 Evinrude 15hp [Re: mjk]
abycat Offline


Registered: 12/06/10
Posts: 2007
Loc: grande prairie AB
I have an old viking 5hp about a 1965. its on the back of my old 63 18' with a chrysler 50 on it. The 50hp is a 1965 as well. ngk in both of those.
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#4184264 - 08/23/16 07:02 AM Re: 1977 Evinrude 15hp [Re: mjk]
mjk Offline


Registered: 02/15/11
Posts: 1233
Loc: Wishin' I was in Wi
Thanks for the info. I have a quart of Amsoil on hand (I'd never buy it for this application). I use it exclusively for my Ice Auger, so I thought I better use up a bit of it this year. Probably just the first tank.


I typically use NGK plugs, so that was the direction I was going to go in. He claims he had more issues with NGK than Champion, which really struck me as odd. I'll look to see what is in the engine later this week.

So, NGK has the nod?

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#4184593 - 08/23/16 02:28 PM Re: 1977 Evinrude 15hp [Re: mjk]
Rand Offline


Registered: 08/20/03
Posts: 12651
Loc: NE,Ohio
Is the amsoil meant for use in water cooled outboards or just air cooled 2 cycle?
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#4184835 - 08/23/16 07:20 PM Re: 1977 Evinrude 15hp [Re: Rand]
mjk Offline


Registered: 02/15/11
Posts: 1233
Loc: Wishin' I was in Wi
Good call. I need Sabre, instead of the Interceptor. Looks like Mag1....

Well, wait..
Amsoil

Originally Posted By: Rand
Is the amsoil meant for use in water cooled outboards or just air cooled 2 cycle?

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#4184838 - 08/23/16 07:21 PM Re: 1977 Evinrude 15hp [Re: mjk]
bvance554 Offline


Registered: 09/24/12
Posts: 2191
Loc: VA
Originally Posted By: mjk
Thanks for the info. I have a quart of Amsoil on hand (I'd never buy it for this application). I use it exclusively for my Ice Auger, so I thought I better use up a bit of it this year. Probably just the first tank.


I typically use NGK plugs, so that was the direction I was going to go in. He claims he had more issues with NGK than Champion, which really struck me as odd. I'll look to see what is in the engine later this week.

So, NGK has the nod?


I'd stick with the previous owners experience before taking a poll here. If he said he always used Champion, and NGK never worked, thats good enough reason to use Champion.

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#4186700 - 08/25/16 11:44 PM Re: 1977 Evinrude 15hp [Re: mjk]
BrocLuno Offline


Registered: 09/06/15
Posts: 5526
Loc: Kalifornia Kollective
An OMC motor (Johnson/Evinrude) of that vintage came with Champions stock from the factory. Prolly J8J or something similar.

I suspect it has manual hi/lo jets that can be tuned with the cover off and the engine running under load. Get a service manual for the motor off eBay and have fun smile

They were touting 50:1 back in the day when I was working part time in an outboard shop in Santa Cruz. Put some rings in those motors because they tried to do the factory 50:1 thing and they don't much care for it.

Have much better luck with 40:1 and any TC-W3 name brand outboard oil. I like Quicksilver oil. Can be had at Walmart for cheap enough. For first run with a new owner, I suggest a bit rich on oil for sure. Smoke never killed anybody, but just in case they straight-gassed it during demo or something, get some oil in there ... I'd pull the plugs and spray some Tri-Flow into the upper cylinders. It'll loosen rings that have been sitting and getting gummy ...

So the motor is approaching 40 years old. Mechanically it will be fine unless it's been abused ... As long as the compression is good, the cylinders are prolly fine. But the electrics can get iffy. The old connections tend to get corrosion and oxidation under all the contacts. As the resistance builds up, they start to fry coils. So pop the flywheel off and clean all the contacts and wire lugs. Reinstall all the wire leads with never seize. The screws that hold the coils down are the ground, don't forget those. New stainless star washers would not hurt. Then the ignition should be fine smile
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#4201062 - 09/12/16 08:16 AM Re: 1977 Evinrude 15hp [Re: mjk]
Bluestream Offline


Registered: 09/13/03
Posts: 5758
Loc: Waterloo, ON
50/1 is fine, Post above is referring to when the factory went 100:1 with bad consensuses. Nothing but NGK plugs, and any BIA TCW3 oil is good. Sure you can use up the Amsoil
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#4202431 - 09/13/16 10:08 PM Re: 1977 Evinrude 15hp [Re: mjk]
BrocLuno Offline


Registered: 09/06/15
Posts: 5526
Loc: Kalifornia Kollective
50:1 was not fine in 1974... It might work if you got the right oil. It sometimes did not work out well at all if you did not. Oil was a lot more hit & miss back then than it is today. A lot of folks thought of 2-stroke oil as a throw-away, so they bought stuff at Western Auto and the like.

I still own and run some OMC's from the 1950's, the 1960's, the 1970's (2, 70HP looper and 140HP bubble back) and one from the 1980's. Don't own any Mercury's or Chrysler's (Mariner) or other stuff. Sold the only Honda outboard I ever had. But I do know my way around the odd OMC motor.

If you are running premium 2-cycle TC-W3 and you know the motor has been on it for a while - 50:1 is OK.

A new-to-you motor, with unknown history, no way. Get the thing oiled with at least one tankful a bit on the rich side with known good oil.
_________________________
Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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