Search results

  1. B

    1978 Johnson 140hp running rough. Need advice

    Little update. Had time this week to get the carbs back on. Fired it up on water horns and its back to idling good on all 4 again. Will take it to the lake this weekend to test in the water as again.
  2. B

    1978 Johnson 140hp running rough. Need advice

    Well I've found some OEM kits local. And yeah I can tell it's picky. For a moment yesterday it was just about right. The off idle was decent and the idle was steady. Maybe the plugs were crappy and undersized or maybe I'm just not knocking them in hard enough to expand them fully.
  3. B

    1978 Johnson 140hp running rough. Need advice

    On the topic of float height. I read the idea is just to get the end of the float opposite the needle just above level with the body of the carb correct? And what was the sealer recommended for the welch plugs? Recall reading about it but can't seem to find that post again
  4. B

    1978 Johnson 140hp running rough. Need advice

    Well I have noticed there throttle shafts do have some play. I'm gonna source some good rebuild kits. Get it all back together and then I heard someone say to try some axle grease around the shafts to help determine if they are causing an issue.
  5. B

    1978 Johnson 140hp running rough. Need advice

    I have no reason to pull the flywheel. Spark is strong and all indicators point towards a fuel issue. Like I say it was running pretty good. Id say the issue on the water was that Welch plug getting loose then coming un-seated again. I wouldn't think they were still making OEM kits for the...
  6. B

    1978 Johnson 140hp running rough. Need advice

    Well the problem was pretty simple. Welch plug didn't stay put. Was hanging out the hole. I used a kit supplied with the boat. Honestly didn't like it. What kits are everyone using? And could I fit this engine with another v4s carbs that are adjustable idle mixture?
  7. B

    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...
  8. B

    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.
  9. B

    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...
  10. B

    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...
  11. B

    1978 Johnson 140hp running rough. Need advice

    Oh I know. My Buddy went through 3 power heads before he got one good one.
  12. B

    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.
  13. B

    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...
  14. B

    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...
  15. B

    Old Crosby 14ft sea sled.

    Planes pretty decent. Doesn't feel sluggish. Trim is all the way down at the moment
  16. B

    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...
  17. B

    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...
  18. B

    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...
  19. B

    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...
  20. B

    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.
Top