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    1978 Johnson 140hp running rough. Need advice

    Kinda frustrating I know it's a fuel issue. the carbs are "clean". All circuits blow through fine with carb cleaner. On the lake when it was running on just the bottom two the choke for a second would cause the top two to pick up and when I got it home and ran it on the horns it did it again...
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    1978 Johnson 140hp running rough. Need advice

    Going to wait till it gets a little darker test spark gap. But it seems like it's isolated to the upper two cylinders Update. Spark on all 4 coils jumps 1/2" pretty easily.
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    1978 Johnson 140hp running rough. Need advice

    Well I took it to the lake and initially everything seemed pretty good. Idle was decent still hiccups a little till it was warm. Transition from idle to throttle just fine. Was pretty happy with it then it just did a complete 180. Didn't want to idle didn't want to go from idle to wide open...
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    1978 Johnson 140hp running rough. Need advice

    Oh i know. My Buddy went through 3 power heads before he found one decent one. I think i may already have it fixed however. And I THINK it was due to crappy carb bowl gaskets. I took it back apart (top carb). Popped those welch plugs out and those little holes for the idle circuit looked...
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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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