1971 50 hp Evinrude - no spark

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Robert Ellis

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Hi, I have a 1971 50 hp evinrude (50173S) that doesn't spark. Don't know much about these stator ignition systems. Is there a way to disable the kill circuit to see if there's an easy fix?
 
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racerone

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Disconnect wire ( black / yellow stripe ) on the cd box and see if there is now a spark.
 
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Robert Ellis

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no, still no spark with the wire disconnected. Is there any other simple 'fix' I can try or is it a stator/power pack problem?
 
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boobie

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Go to cdielectronics.com for good trouble shooting procedures.
 
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Robert Ellis

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Hi, I went to the cdi site but couldn't get too far into the trouble shooting due to not having a DVA adapter. There is still no spark with the rectifier wires disconnected. In the meantime I've obtained a parts motor with a functioning ignition system (so I'm told) so I'll start swapping bits over. Does it make sense to start with the power pack or the stator or something else? - the power pack changeover seems to be a more straightforward operation than the stator - are there any 'pitfalls' I should look out for while doing these swap overs? As mentioned earlier, I've no experience with this type of ignition system.
 
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Robert Ellis

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I guess I'm talking to myself but what the heck. I think I got lucky with the power pack switch over. I now have spark ... it jumps a good ways but seems thinner somehow than the spark I'm used to from a magneto/points system - does that make any sense? I'll try to get it on the water today to start it. Hopefully that push button gear shifting will work ok.
 
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Robert Ellis

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Yep, happy to say it fired up and ran quite nicely - the push button shifting worked well. I was surprised at how much more power a 50 hp has compared to a 40 hp.
 
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Tylerwalker38

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This post is 4 years old but I'm currently looking anywhere for answers myself. I purchased a 1971 Evinrude 50 hp from a guy that couldnt get spark as well. I've replaced everything and still getting nothing . Power pack , stator , timer base , rectifier , both could packs plugs , control box... You name it and I'm getting nothing. As I ohm everything it all checked bad so I replaced it all. Even have a wiring diagram for it and made sure everything was right . Next step going to get a test light and make sure I'm getting power through everything still. Really at a lose here and if anyone had some input that would be great.
 
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racerone

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12 volts from the battery is not used to get spark on this ignition system.-----Spark is made by the magneto when it is spinning fast.----Oh----Start a new thread cause they will likely close you down !
 
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