Help with 1967 6hp Evinrude

M

matt-fortmyers

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Jan 2, 2011
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I just bought a 67 6hp Evinrude and it runs well. I was happy to see that so much support is available through this forum. I'm completely new to outboards. I have some questions-- any support would be appreciated.

I'm running it on a 50:1 mix but I'm using 2cycle oil for air cooled motors (not marine grade). Do I need marine grade?

I'm running it in salt water. Do I have to regularly run fresh water through the engine?

What is the best position for the mix? It runs best turned almost completely down to 0, but this seems wrong to me? Any suggestions? It does not idle well and I feel like I'm putting into gear with the throttle far too close to the Start label.

Any other advice regarding this motor would be greatly appreciated!

Thank you kindly,
Matt
 
F

F_R

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Jul 7, 2006
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28,224
Re: Help with 1967 6hp Evinrude

The oil will gradually cause excess carbon and ring sticking. You should be using TCW-3 outboard oil. The additives are different because operating temperatures are different.

Flushing is a good thing to do. You have to do it immediatly after returning from an outing, or it really doesn't do much. The motor was built to survive in salt water, but it will survive longer if you flush it.

That knob is the slow speed mixture. You say it won't idle. Sounds like you need to adjust the knob for best idle. If it won't adjust, something else is wrong.
 
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matt-fortmyers

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Re: Help with 1967 6hp Evinrude

Thanks! I'll adjust the knob until I locate where it idles best. What I noticed it doing today was slightly adjusting speed on its own when I was running at low speeds--some sputtering, too. It seems to run best at slightly higher speeds. Could the spark plug be the cause of this or possibly my oil mixture (I'm running 50:1, but it was approximate in my mixing 3/4 cup oil to 2.5 gallons gas)?
 
jay_merrill

jay_merrill

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Re: Help with 1967 6hp Evinrude

Your motor should idle at 550 rpm in gear, warm engine.

To get there, screw the low speed needle valve (the knob you have been turning) in until it gently seats. Do not screw in too much, because you will crimp the tapered surface of the needle valve if you do and that will ruin it. Turn back out 1-1/2 turns. This is your starting point for LS need valve adjustments. With the boat tied to the dock (or with a test wheel in a tank) and in gear, adjust for 550 rpm.

Note: There is actually more to this procedure, but the abbreviated version should work.

As F_R said, any oil rated to the TC-W3 standard by the NMMA, is adequate for you r outboard. I prefer the Pennzoil brand and use their semi-synthetic product. Here's a link from Pennzoil that gives some pretty good info on their products.


http://www.pennzoil.com/documents/Multi-Purpose+2-cycle+engine.pdf



???
 
1946Zephyr

1946Zephyr

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5,556
Re: Help with 1967 6hp Evinrude

You could also check and make sure your points are gapped correctly too. They should be cleaned and gapped at .020
 
Joe Reeves

Joe Reeves

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Feb 24, 2002
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13,262
Re: Help with 1967 6hp Evinrude

(Carburetor Adjustment - Single S/S Adjustable Needle Valve)
(J. Reeves)

Initial setting is: Slow speed = seat gently, then open 1-1/2 turns.

Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running.

Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

Note 1: As a final double check setting of the slow speed valve(s), if the engine has more than one carburetor, do not attempt to gradually adjust all of the valves/carburetors at the same time. Do one at a time until you hit the above response (die out or spit back), then go on to the next valve/carburetor. It may be necessary to back out "all" of the slow speed adjustable needle valves 1/8 turn before doing this final adjustment due to the fact that one of the valves might be initially set ever so slightly lean.

Note 2: If the engine should be a three (3) cylinder engine with three (3) carburetors, start the adjustment sequence with the center carburetor.

When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.
 
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