1977 Evinrude 6hp losing spark

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davesko
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1977 Evinrude 6hp losing spark

Postby davesko » Tue Dec 05, 2017 4:38 pm

Hi guys, I have a 1977 Evinrude 6hp that loses spark when you turn the throttle down. It has spark from the full throttle position down to the start position but anything lower it loses spark. I’m thinking the wiring coming from under the flywheel,anything else to look for while I’m under there? Should I splice the wires or replace them completely? Thank you, Dave

FrankR
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Re: 1977 Evinrude 6hp losing spark

Postby FrankR » Tue Dec 05, 2017 6:13 pm

So, how do you get it started? At full throttle setting? Or does it even start?

FrankR
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Re: 1977 Evinrude 6hp losing spark

Postby FrankR » Tue Dec 05, 2017 6:24 pm

Sure sounds like a wires problem. But make a quick check of the obvious, like a loose or mal-adjusted sensor or driver coil.
Those wires are sort of special for flexibility, so I'd replace them.

davesko
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Location: Hershey Pa

Re: 1977 Evinrude 6hp losing spark

Postby davesko » Tue Dec 05, 2017 6:29 pm

It does start on the start position and runs fine but when turned down it stalls. Going to replace wiring. Thank you Frankl

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Tubs
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Re: 1977 Evinrude 6hp losing spark

Postby Tubs » Tue Dec 05, 2017 8:41 pm

Possibly----- Excessive ware in the mag
plate where it rotates. Check to see if
the points are closing in the slow position.
Image Image Image Image

davesko
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Re: 1977 Evinrude 6hp losing spark

Postby davesko » Tue Dec 05, 2017 9:02 pm

No points on this model.

FrankR
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Re: 1977 Evinrude 6hp losing spark

Postby FrankR » Tue Dec 05, 2017 9:38 pm

There really isn't much to go wrong in there. The only moving parts are the flywheel and entire armature plate. The wires look kind of funky on the one I have.

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davesko
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Re: 1977 Evinrude 6hp losing spark

Postby davesko » Tue Dec 05, 2017 9:43 pm

I’m just going to rewire it. Pretty sure that the trouble. Thank you Frank

rickrodt
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Re: 1977 Evinrude 6hp losing spark

Postby rickrodt » Wed Dec 06, 2017 9:21 am

Before you "rewire" the mag plate, which is hard to do because all the wires lead to the sensors and charge coil, you should check for spark at the throttle position you describe. If it starts, then you have spark at that throttle position. Are you sure it is not leaning out and stalling for lack of fuel? Hook a spark checker that can test both coils and not just lay the spark plugs on the block because that motor will throw a 1/2" spark with ease. Once you have the spark tester in position, then move the throttle around and see if you get spark when you pull the starter rope. I would do this with the spark plugs out of the motor for ease of pulling. If you cannot find the spot where the spark dies out, then that is not the problem. Just saying, do the easy stuff first then go and do the difficult stuff.

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Chinewalker
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Re: 1977 Evinrude 6hp losing spark

Postby Chinewalker » Wed Dec 06, 2017 10:31 am

Agreed - you may have a low speed circuit issue in your carb rather than a spark issue. Troubleshoot before surgery...


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