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Shake rattle and no roll 1994 Johnson


BRUNO

Question

Thought I would see if the any of you had experienced the problems I am having with a 1994 120hp Johnson. Last year when I ran it it would run fine up to almost ¾ throttle. AT that point it would bog and start to shudder and shake. I rebuilt the carbs and took it out last Friday. Started fine, idled great once it burn off the fogging oil. Get up to ¾ throttle and it started sputtering again. Plugs are new, gas is too. Ran just great at ½ throttle and lower. Now I did notice that the throttle itself pushes smoothly until it reached that ¾ open position. It then becomes hard to push and I have not forced it. Plan on looking at it again this weekend. I seem to remember in my 1969 Pontiac Lemans convert , 350 CI , 335 hp, that when the timing chain slipped a notch due to the desire to go fast NOW that it then burbled and burped like the outboard. Is there a mechanical vacuum advance on this outboard. Any advice?

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  • 'we have more fun' FishingMN Creators

When you said the throttle hangs at 3/4 then shudders, I wonder if you have something interfering with the mechanical advance. Pop the hood off stick it in forward and look to see whats going on when you advance the throttle. Look for the throtle limiter hitting and binding or a plug wire in the way. All done in the driveway with the engine off of coarse

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I'll second surf. First thing is to rule out mechanical issues. Moving parts always fail first.

There is nothing in the non-mechanical motor function that I can think of that would restrict the physical movement of the throttle.

Put it in gear with the motor off and compare. If you are binding up at 3/4 throttle, find the cause. If not, look at all the mechanical items that impinge against the throttle when on and you should be able to rule to one or two items.

Another option is to call that old TCO shop in Shakopee, they haven't let me down, yet.

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  • Your Responses - Share & Have Fun :)

    • CigarGuy
      Nice job Bob! Fishing off the neighbors dock sucked for us. My gang is coming up Thursday night till Monday, this will be our opener, we'll hit it hard. It's a bummer my dock is mostly under water and the lift isn't in. Thanks to the neighbor around the corner for letting us park on shore at there place next weekend.
    • SkunkedAgain
      Well, I chose my screen name for a reason. 😆 Congrats to everyone
    • Bbobber
      I had a great weekend the weather was decent and fishing was good. I caught 5 walleyes 21"-25", 4 northerns largest was 32" and a 17 largemouth opening day. 2 more walleyes, 2 crappies 2 northerns on Sunday all on jig and minnows.
    • DLD24
      We had a good opener as well we could have kept limits opening day, but just kept enough for a fish fry. Then Sunday had our little friendly tourney and everyone had a pretty good day. Pulling cranks and jigs n minnows caught fish.  
    • Kettle
      Water temp today 45-50. Few fish, windy and cold 
    • Tominator692
      Had a great opening weekend. Son and I boated 51 walleye between Saturday and Sunday. Plenty of small stuff but no problem getting some nice keepers. This is a pic of the best weekend fish for us. 
    • fishingstar
      I was on Rice this weekend also. Seen boat lifts with water up to the canopy. I was the only one to catch a fish out of the hole campground It was about a 6" crappie.
    • BWpineisland
      We had a pretty good weekend. There were two couples and we limited out both Saturday and Sunday. The eyes we kept were all 15-17”.  We caught many 10-14” eyes and one 26” which was returned to the water immediately. All on a variety of jigs in 18-35’ of water. As usual the women out fished both of us😀
    • Bloatlord
      Wrong area, sorry.
    • Raven77
      I will second the advice on watching out for floating debris.  We saw a lot of floating logs and deck sections this weekend.  Also, most hazard and navigation buoys were not out yet.  I wonder how many lower units and props were destroyed this weekend?  It would be dicey if you don't know the lake.
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