35hp evinrudes

Jack Mears

Seaman
Joined
Oct 12, 2008
Messages
64
I have 2 1959 35 hp Evinrudes. One is a Lark- Mod.#35517. The other one is not a Lark- Mod.#35012.
What's the difference between the two motors?
Also do I run these motors on 50-1 gas oil mix?
 

F_R

Supreme Mariner
Joined
Jul 7, 2006
Messages
28,226
Re: 35hp evinrudes

I have 2 1959 35 hp Evinrudes. One is a Lark- Mod.#35517. The other one is not a Lark- Mod.#35012.
What's the difference between the two motors?
Also do I run these motors on 50-1 gas oil mix?

35012 is a manual start, short shaft motor with tiller steer. 35517 Lark is electric start, long shaft, tiller was offered as an accessory. The Larks have a different color and fancied-up trim. Other than that, they are the same motors.

I'm not getting into the oil mix fight again. Except to say the original specs were for 24:1.
 

1946Zephyr

Vice Admiral
Joined
Oct 21, 2008
Messages
5,556
Re: 35hp evinrudes

It's okay F_R, I'll back ya up. The more sensible guys here will too:D

If you run 24:1 in those buggers, you'll be much better off, than tryin to run 50:1 like some say you can do. They say that motors from 64 on are made to run on 50:1 and I believe that is because the better alloy in the pistons will allow for it. Fully Jewelled engines in prior years can get away with running 50:1 but it isn't recemended, because if they ever get a little too warm, there is a higher risk of scoring on the pistons. If you're running the motor at WOT quite frequently, then 24:1 is much better anyhow and less likely to foul plugs.

bottom line is: It's better to have a slightly oil fouled plug, than it is to have a scored piston.;)

Good motors, BTW.
 

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: 35hp evinrudes

Votes 3-0 for 24:1.
 

Jack Mears

Seaman
Joined
Oct 12, 2008
Messages
64
Re: 35hp evinrudes

Thanks guys. I'll use 24-1 mix.
This Lark is almost pristine but has no remote cables to install in the boat. In other words-it's bare bones.
I need em'. Any ideas where I can find them.
I've ordered a parts manual and should know more about what's required shortly.

Thanks again for all the replys!
 

1946Zephyr

Vice Admiral
Joined
Oct 21, 2008
Messages
5,556
Re: 35hp evinrudes

There you go buddy. I even had two moderators backin me up. :D:D:D

Fortunately, those motors are really easy to get remote controls for and parts. I bought some stuff here last time, for my JW-14.

www.twincityoutboard.com

There is a pretty lengthy list of salvage yards that someone posted here on the forums, but I couldn't find it. Hopefully, it'll be in the top secret file or someone will give you some more ideas.:cool:
 

coolguy147

Commander
Joined
Jul 14, 2008
Messages
2,817
Re: 35hp evinrudes

20-1 =) just kidding. my vote is on 24:1

i have never had a fouled plug so far. keep a clean carb. do a decarb. good spark. correct needle mixture. should be good to go:D

do not forget a new water impeller
 

1946Zephyr

Vice Admiral
Joined
Oct 21, 2008
Messages
5,556
Re: 35hp evinrudes

hey coolguy. How's your 35 runnin?

Gotta love this young man. He's a pretty sharp kid and has a lot of knowledge for his age. I imagine by the time he's 20, he'll be a service manager somewhere fixing outboards.:D:D I loved his thread on the old QD-10 he fixed up.

I've had more plugs puke out on me from sitting over the winter, than running outboards.;)
 

jay_merrill

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Joined
Dec 5, 2007
Messages
5,653
Re: 35hp evinrudes

Hundreds of hours on a pair of 1958 ERude Bigtwins, using Pennzoil semi-synthetic @ 50:1, with zero problems.

7:1

Did it because my local OMC/BRP dealership owner (35+ year authorized OMC mech) says its OK.

7:7 (yup, he gets more votes than the rest of us)

Modern semi-synthetics and full synthetics are light years ahead of the old dino oils, in terms of protection.



???
 

1946Zephyr

Vice Admiral
Joined
Oct 21, 2008
Messages
5,556
Re: 35hp evinrudes

Well, I won't doubt your word. As I stated in my earlier post, the older engines that were fully jewelled (meaning all needle bearing set up) work fine. Some one who maintains the cooling system good enough to prevent overheating, will have a lower risk of problems. I've ran the older engines like this with a 50:1 mix myself with no problem, simply because the 2 cycle outboard oil is much better today, than it was back 51 years ago. Keep your engines top notch and you can get away with anything.:D
 

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: 35hp evinrudes

The excuse that modern oils are "light years ahead" of the oils of 50 years ago may well be true but is of no merit in determining safe mix ratios.

BRP's specification of 24:1 for that engine is modern and specifies modern oil.
 

jay_merrill

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Joined
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Messages
5,653
Re: 35hp evinrudes

Sure it has a bearing on safe mix ratios. Synthetic oils maintain better viscosity, shear characteristics, etc. This info is the product of lots of lab testing. That said, I agree that the presence of needle bearings makes a lot of difference.

As for the modern spec/modern oil issue, gotta disagree again - you can bet the legal dept. is the origin of the continued 24:1 advice, not the technical folks. At best, the tech folks might have chimed in on the fact that some people might assume that the old motor can be run at 50:1, on "modern dino oil." My practices are based on semi-synthetic, as a minimum. I've had a really good experience with the Pennzoil brand, and only went to BRP XD-50, when Walmart stopped selling the Pennzoil.

I don't think I'd run something like a '55, 5-1/2 hp Johnson on 50:1, but I've done it extensively with "needle bearing motors." I haven't ripped the powerheads apart to see exactly what the condition is at this point, but can tell you that the compression values remain high and the motors run just like they did when I started with the "thinner mix."



???
 

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: 35hp evinrudes

Well, Jay. Maybe you are smarter than all of the other posters in this thread, and OMC/BRP, too.

While I admire and respect your knowledge, I think not.

There is no basis for accusing BRP of dishonorable motives other than pure, hostile speculation and a search for a rationale for ignoring their specifications.

The credentials of the other posters here really overwhelm your friend, the dealer.
 

jay_merrill

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Joined
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Messages
5,653
Re: 35hp evinrudes

I don't think I am "smarter than the average bear," but have spent enough time in the corporate environment to know what goes on in a great many companies. That doesn't mean that all of them do this sort of thing and it doesn't even mean that BRP are bad folks. Corporate legal departments are "risk adverse" and influence operational, financial, logistical, yada, yada, yada, decisions all of the time. Its just a fact of business life.

These sorts of things always come down to some rational decision making. For example, I am pretty hardcore about using PFDs all of the time. I don't do this just because the Coast Guard or some other agency promotes their use. I wear them all of the time, because I read a lot and know what the stats indicate, with the point being that I react to demonstrated results.

The same is true of the oil issue. I researched the matter, talked to a bunch of very experienced people and made a rational decision that has proven, through extensive use, to be a good decision for me. I almost wish I had a reason to tear one of my Bigtwin powerheads apart, just so I could examine and photograph its "internals."

At any rate - to each his own, but I'm going to keep running mine as I have been.


PS: I have to add one thing - while I have tremendous respect for the knowlege of a lot of folks here, including a fella by the handle "JB," to suggest that a guy who has been a trained OMC mech for 35 years, has owned his authorized dealership for most of that time and who still works on the motors for a good portion of each day, doesn't know what he is talking about, is sort of silly. This man has pulled apart and reassembled more OMC outboard motors than any 50 of us here. There might be a couple of people around here with equal background and knowlege, but that's very fairly, about it.


???
 
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