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  1. C

    88 spl surging,dropping rpms,then surging.

    flush the old gas and run a small tank with some engine cleaner ...maybe you can clear up some obstruction... if not a carb job may be in order. jmho
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    New to me 18 hp Evinrude.

    solid ......but solid as in multi strand wire for flexibility . copper is nice but anything metallic will work fine. 18 inches or so will get you near 0 ohms resistance compared to carbon stuff !
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    Mag gremlins.

    1973 40hp Norseman (Evinrude/Johnson-era motor under a different badge),
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    1977 Evinrude 85hp - Intermittent power loss

    chat gpt opinion ... 🔧 1. Ignition System (most common on old OMCs) Stator & charge coils – These can develop heat-related failures. They may work when cold but lose output when warm, causing a weak or missing spark. Power pack (CDI unit) – Classic for intermittent misfire or total loss on one...
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    Mag gremlins.

    see chat gpt reply... what would cause a 1973 40hp Norseman ignition to fail intermittently on one cyclinder On your 1973 40hp Norseman (Evinrude/Johnson-era motor under a different badge), intermittent ignition failure on one cylinder usually comes from the ignition system rather than...
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    Mag gremlins.

    do you loose it solid like and it gets back normal after a cool down period ?. have condensers (even new ones) been load tested with a proper high voltage test apparatus ?(Merc-o... or mohat box) so when did all this start happening ? after some maintenance you did or suddenly ? try an extra...
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    Power Pilot problems

    so what exactly is the concern here ??
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    New to me 18 hp Evinrude.

    Coils available today are dirt cheap (Amazon) & seem to have a wide range of secondary resistance values ...sometimes 4K sometimes I have seen some at 8-9 Kohms . Try to stick with OEM $$$$ 8-9Kohms may mean more turns to induce move volts or it may simply mean cheaper China...
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    New to me 18 hp Evinrude.

    Visit the AOMCI western site ( link posted above) for great docs covering condensers, testing, repairs and if you plan working oldies there is a great little condenser test box you can build. You can ask mr.Mohat to send you the diagram. (read his article ). His basic model without this...
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    New to me 18 hp Evinrude.

    eye testing sparks is tricky...at best at least you have sparks. suggest to read up on magnetos... never having taken out the long bolts on coils corners !! the $20 suggested for older engines explains it all as well as utubes and this article...
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    1956 Evinrude 15hp Impeller Change

    post is 18 years old...... best to start a new one !! see #60 behind the plate
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    1995 Evinrude E90TLEO charging

    infinity is what your meter displays when probes do not touch..... anything else is resistance of varying values. some meter autorange hold style analog .needle meters must be set on the proper R value range
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    1981 Johnson 115hp 4 cyl

    chat gpt says... On a 1981 Johnson 115 hp 4-cylinder (crossflow V4, 2-stroke), a sudden power loss after running fine for 20–30 minutes, then returning to normal later, usually points to an intermittent heat-related or fuel delivery issue. Here are the most common causes: 🔧 Fuel-related causes...
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    1995 Evinrude E90TLEO charging

    when testing for grounds make certain all leads are disconnected from anything external
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    Thoughts on 90hp ETECH

    my 2005 75hp kid brother twin of a 90 hp (same hardware) has been a dream machine for 20 years now. but.... these engine require pampering...good fuel good filtering...2+4d gas conditioner recommended. I run EV engine cleaner, I store FULLY fueled 6 months per year in winter after...
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    New to me 18 hp Evinrude.

    coils points condensers are all the same....standard mag since early 50s onward. strand copper or just plain metallic is usually available in bike shop or lawnmower shops. Carbon fiber is for cars to prevent static noise on the AM band because metallic cable would radiate high...
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    BRP outboard old but funny

    Old J&E are like the Everady bunny...
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    New to me 18 hp Evinrude.

    btw that book predates your model but... the mag is the same and so are lots of parts and concepts to service your "newer" engine :-)
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    New to me 18 hp Evinrude.

    ok looks like simple electrical problem and removing the plate is simple ...remove back corner coil long bolts and 2 base screws to lift out the assembly sorry can't posts pics now :-( get this book it has all the info you need to service oldies...select & download store on your PC or...
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    New to me 18 hp Evinrude.

    when it dies and while still HOT ... from plug boot .....measure HV side resistance to coil to engine body ground ...expect 4-8 KOhms if open ... bad coil or wire wiggle things a bit incl boot did you replace plug wires yes-no ? with 7mm metallic strand wire (no CARBON wires!!)...
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