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    1978 Johnson 140hp running rough. Need advice

    Oh I know. My Buddy went through 3 power heads before he got one good one.
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    1978 Johnson 140hp running rough. Need advice

    I went off my clymer manual. Stated that minimum compression would be 100 psi, but that it was more important that 4 cylinders are even.
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    1978 Johnson 140hp running rough. Need advice

    I've used two testers. When I bought the boat The sellers tester read 110 across the board every cylinder was spot on the same reading(nicer gauge. easily readable) . The tester i used just yesterday is one thats cheaper has 90psi then next number on the gauge is 120. The needle lands right...
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    1978 Johnson 140hp running rough. Need advice

    Picked up a boat recently with this 78 Johnson 140. It had a poor idle. Pops out the exhaust and stumbles. Eventually dies. Also most of the time it hates transitioning from idle to WOT. Most of time just stalling when coming off idle under load. When it does make it through it does fine at...
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    Old Crosby 14ft sea sled.

    Planes pretty decent. Doesn't feel sluggish. Trim is all the way down at the moment
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    Old Crosby 14ft sea sled.

    So recently I got ahold of an old 72 14ft Crosby sea sled. Well used with it's own host of issues. But sturdy enough to finish out the season. I noticed the layout of mine is a bit different from what I've seen. Most tend to have a bench in the middle with a seat and a seat up front on...
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    New to me 18 hp Evinrude.

    Well currently spark is a nice blue "strong" spark. it does seem to jump roughly a 3/8 gap to the block. I may have been chasing partially a fuel issue. I think the cutting out was in fact spark related. But the coughing and sputtering I believe I've got that solved. I fired it back up today...
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    New to me 18 hp Evinrude.

    One coil just didn't spark well at all at slower speeds. Put one in that did better but not perfect. So I'm just gonna need new coils. Any recommendations on brand? I also swapped around the condensers and initially assumed there was no change as spark visually looked the same, but when I...
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    New to me 18 hp Evinrude.

    So swapping the coils the spark still looks great at the plugs. However the bottom cylinder still ran without missing and the issue stayed on the top cylinder so I can rule out that coil. And you can still here it cut in and out. Gonna swap condensers and recheck tomorrow. I don't get alot of...
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    New to me 18 hp Evinrude.

    This is the issue. Figured I'd upload a video. In this video I only have the top cylinder plug wire on. It does this. Then on the water it seems it just gets worse until it's missing entirely.
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    New to me 18 hp Evinrude.

    Its simple enough I'm gonna swap coils around and see if the problem follows the coil. If it does then I'll have confirmed the coil issue. If it doesn't then I'll check condensers and points.
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    New to me 18 hp Evinrude.

    Did some more testing and honestly I'm just more confused. Spun up with a drill and the plugs out to see the spark. Both plugs sparked great. Even when spun up to speed. One thing I did notice was the top cylinder the faster I spun it over the spark got brighter and brighter. Where as the...
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    New to me 18 hp Evinrude.

    Yeah the one newer coil had the screw in type wire. I changed one of the plug wires and it wasn't sure if it was solid or not. So I know both wires are solid copper. Fixed the ground. I took out the kill wires completely. The switch is bad and the wires cut already so I just removed them. I...
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    New to me 18 hp Evinrude.

    So the wires are solid core. I compared them to a set of wires I have off an old armature plate that are original wires and they're exactly the same as far as the copper and the thickness. And as far as screwing the wire in the coil just has a spike where the wire goes in it's not like a...
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    New to me 18 hp Evinrude.

    Thata definitely my next step. Getting some solid core wires and replacing them the correct way.
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    New to me 18 hp Evinrude.

    Yeah not fixed. It was okay for run but then went back to missing and then to not running on the second cylinder again.
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    New to me 18 hp Evinrude.

    Are all the old points coils the same regardless of hp? I'm fairly certain the coil i put in was from a 9.5hp. Obviously the same dimensionally. But would there be any difference in the spark?
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    New to me 18 hp Evinrude.

    You do? I've always had luck just popping them out and if needed snipping the end of the plug wire and putting it back in. But then again. I've done say 6 of these older Johnson/Evinrudes with the points ignition so I may just be getting lucky. Are those adjustable spark gap testers suitable...
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    New to me 18 hp Evinrude.

    Yeah I'm familiar with servicing these ignitions. (How to set points, install parts etc). Though when a spark appears good when tested but cuts out when ran I don't have the experience to know what that indicates. But it makes sense those two longer coil screws I always wondered why they were...
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    18 or 25? Anyway to tell?

    Ohh it is very sketchy haha. It seems to hold up just fine to the power for now. So I'm gonna ride it out till winter then dig into that.
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