1972 Evinrude High Speed Miss

Home Forum Ask A Member 1972 Evinrude High Speed Miss

This topic contains 22 replies, has 9 voices, and was last updated by Avatar dan-in-tn 4 months ago.

Viewing 15 posts - 1 through 15 (of 23 total)
  • bobw
    bobw
    US Member - 1 Year
    Replies: 532
    Topics: 25
    #166391

    While out running my ’72 Evinrude 25hp yesterday, I noticed it had developed a mid to high speed miss. It idles well and is smooth up to about half throttle and then develops what sounds like an ignition miss. I had previously installed new points, condensers, coils, wires and plugs in my restoration project last year. I pulled the flywheel today and checked things out. I found the #2 cylinder points a little wide at about .025 and during that process noticed I had foolishly installed the magneto cam upside down during my restoration work. I’ve made those 2 corrections and ran a quick spark check – I’ve got hot blue spark at 1/4″ gap. I don’t see any sign of spark grounding on the plug wires or mag plate. Could those 2 errors alone have caused the high speed miss or anything else I should double-check before I close the mag up again?

    Bob

    1954 Johnson CD-11
    1956 Johnson RD-18
    1958 Johnson QD-19
    1959 Johnson QD-20

    frankr
    frankr
    US Member - 1 Year
    Replies: 4252
    Topics: 43
    #166392

    I’m very surprised it ran at all with the cam upside down.

    bobw
    bobw
    US Member - 1 Year
    Replies: 532
    Topics: 25
    #166393

    So was I.

    Bob

    1954 Johnson CD-11
    1956 Johnson RD-18
    1958 Johnson QD-19
    1959 Johnson QD-20

    Avatar
    billw
    US Member - 1 Year
    Replies: 1019
    Topics: 33
    #166416

    Sure sounds like ignition was probably the issue, with all that being wrong! However, if it still doesn’t work, or starts to misfire down the road, be advised that those engines are somewhat prone to failing head gaskets and getting water on the spark plugs, especially if it is, or was, a s salt water motor.

    While on the subject, the 22 cubic inch OMCs are so prone to seizing up during storage that I have been fogging mine out every time I finish running one. I can’t even count how many 22 cubers I have seen die of internal corrosion. Such a shame; as they are great motors.

    Avatar
    durco
    US Member - 1 Year
    Replies: 3
    Topics: 2
    #166418

    If you have not cured your problem then check for armature plate wear/play. If the plate has wear, the motor will not stay in tune at the full range of rpms, as the point gap will continuously change……..

    bobw
    bobw
    US Member - 1 Year
    Replies: 532
    Topics: 25
    #166426

    Thanks guys. This was a salt water motor in its previous life but during the tear-down, I found the block to be in good shape. I replaced all the powerhead gaskets as part of the restoration including the head gasket.

    I’ve also been fogging this motor after every use, as I had heard they were prone to internal corrosion.

    I’ll be sure to double-check the armature plate for any play, but I suspect the points and cam issue were the problem. Still can’t believe it ran at all with the cam upside down. That at least explains why it was so hard to start!!

    Bob

    1954 Johnson CD-11
    1956 Johnson RD-18
    1958 Johnson QD-19
    1959 Johnson QD-20

    Avatar
    fleetwin
    US Member - 2 Years
    Replies: 2669
    Topics: 32
    #166525

    Well, I am not convinced this is actually an ignition miss….You mention the engine idles and runs at WOT OK…. So, the miss/rough running is occurring at mid range speeds, correct?
    Have you checked the throttle cam pick up adjustment? It will run rich at midrange if the cam pick up is retarded, it will sound like an ignition miss….
    Keep in mind these engines are not the smoothest running engines, since the recirculation system was added and overboard drains eliminated….I just don’t want to see you spend hours trying to fix an engine that may not be “broken”.
    I too, am surprised the engine ran at all with the cam upside down…
    Perhaps those two issues will solve your rough running/missing issues….

    Avatar
    PugetSoundBoater
    US Member - 2 Years
    Replies: 977
    Topics: 135
    #166589

    Would this internal corrosion issue effect my 1981 Johnson 25hp J25RCIM? Is that a 22 Cu In motor?

    I fogged it after the end of the season 2017. I use it in salt water and barrel flush it after every time i use it with Salt Away.

    "Some people want to know how a watch works, others just want to know what time it is"
    Robbie Robertson

    bobw
    bobw
    US Member - 1 Year
    Replies: 532
    Topics: 25
    #166597

    Fleetwin – I probably didn’t articulate the problem well. The miss was starting at mid-range and continued up to WOT. I did check the throttle cam pickup and it was spot on. I adjusted the points and installed the magneto cam correctly so I think that will take care of the problem. Haven’t had a chance to run it again yet but should get it done later this week.

    Still can’t believe I put the cam in wrong – it has TOP noted on it for a reason!! Reminds of the old joke about how some people need to have the bottom of their Coke bottles or can labeled “Open Other End”.

    Bob

    1954 Johnson CD-11
    1956 Johnson RD-18
    1958 Johnson QD-19
    1959 Johnson QD-20

    Avatar
    billw
    US Member - 1 Year
    Replies: 1019
    Topics: 33
    #166614

    Pugetsoundboater, yours is not the 22 cuber in question. I think it is 32, if memory serves me. Anyway, they didn’t seem to be as prone to the problem of locking up in storage; although I did see a few of them blow a head gasket and misfire, due to water on the plugs. If that were the case, it would definitely lock up in storage! The blown head gaskets would sometimes come after an overheat, but not always.

    Avatar
    PugetSoundBoater
    US Member - 2 Years
    Replies: 977
    Topics: 135
    #166620

    billw- thats good news that my ’81 25hp is excluded from the corrosion issue.. This motor runs great and was a fresh water motor till i got ahold of it.
    Thanks, Jim PSB

    "Some people want to know how a watch works, others just want to know what time it is"
    Robbie Robertson

    Mumbles
    Mumbles
    Canada Member - 2 Years
    Replies: 4107
    Topics: 420
    #166652

    Throw your Champion plugs away and try a set of NGK’s. You’ve got nothing to lose and possibly a whole bunch to gain.

    bobw
    bobw
    US Member - 1 Year
    Replies: 532
    Topics: 25
    #166653

    Thanks Mumbles. I’ll give that a try as well. Interesting coincidence I just remembered – when I was originally given this motor it had NGK plugs in it.

    Bob

    1954 Johnson CD-11
    1956 Johnson RD-18
    1958 Johnson QD-19
    1959 Johnson QD-20

    • This reply was modified 5 months, 1 week ago by bobw bobw.
    Avatar
    fleetwin
    US Member - 2 Years
    Replies: 2669
    Topics: 32
    #166655

    Reread your post, and it does read “right up to full throttle”…….So, you are most likely dealing with an ignition miss….Hopefully the cam and points adjustment will take care of the issue….
    If not, I would monitor ignition performance with a timing light or inline neon tester to isolate which cylinder is messing up….
    And yes, the older 22CI powerheads were prone to sleeve corrosion in salt water, but I’m betting/hoping this isn’t the issue in your case…
    One final question, which OMC ignition kit did you use? The 172523 OMC ignition kit has different condensers and it meant for the larger hp engines like yours….. Just a thought….

    bobw
    bobw
    US Member - 1 Year
    Replies: 532
    Topics: 25
    #166669

    I used the 172523 ignition kit. I’m taking the motor out again today for another test.

    Bob

    1954 Johnson CD-11
    1956 Johnson RD-18
    1958 Johnson QD-19
    1959 Johnson QD-20

Viewing 15 posts - 1 through 15 (of 23 total)

You must be logged in to reply to this topic.