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1997 Johnson 115 SPL will not accelerate - stalls when put in gear

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  • 1997 Johnson 115 SPL will not accelerate - stalls when put in gear

    Hello Everyone. We have been trying to troubleshoot the following for a few weeks.
    The engine starts fine however when put into gear and try to accelerate it dies. Here is a list of everything we have tested. One more thing the engine revs up fine in neutral.
    1. rebuilt carbs - replaced needles, floats, gaskets, and blew out the high pressure jets. Everything looked really clean but I know it only takes a small grain of dirt to cause problems. The cars do not have any adjustments very basic. (no mixture screws, etc)
    2. replaced fuel pump - check screen for clog. We have a 6 gallon portable tank hooked up to confirm lines from tank to engine are good. When we prime the tank by pumping the ball it stays hard once primed. No signs of any leaks, etc around fuel pump.
    3. Checked compression about 105 on all 4 cylinders
    4. Checked neutral stop switch. To test we made sure the switch was pressed down which prevented the engine from starting. When we released the switch the engine started fine.
    5. The automatic primer is working correctly. If we manually turn it on when the engine is idiling it dies.
    6. Checked all hoses - vacuum and fuel.
    7. New plugs.
    8. replaced lower unit oil (confirmed it was full twice)
    We are now thinking the PowerPack might be the problem.

    Originally the boat ran fine, then we slowly started loosing acceleration - somedays it ran great others like crap, now as soon as we leave the dock and give it gas in gear she dies.

    I appreciate any ideas or suggestions. Hoepfully we can get this figured out soon it is finally nice weater here in CT.


  • #2
    Re: 1997 Johnson 115 SPL will not accelerate - stalls when put in gear

    Lynk & Sync ?

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    • #3
      Re: 1997 Johnson 115 SPL will not accelerate - stalls when put in gear

      Hello Daviet - what do you mean by lynk and Sync. Any guidance how to check this or correct it would be appreciated.

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      • #4
        Re: 1997 Johnson 115 SPL will not accelerate - stalls when put in gear

        Lynk & Sync is adjusting the throttle linkages with the timing linkages to make sure they both operate in synk with each other. You will probably need a manual (factory) to go through the adjustment. Some one will come along and offer other suggestions.

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        • #5
          Re: 1997 Johnson 115 SPL will not accelerate - stalls when put in gear

          you want to make sure that all the carbs are opening at the same time -if they arent itll cause all kinds of problems
          also you may want to check the timing

          use joes reeves method heres the link
          http://forums.iboats.com/showthread.php?t=228183

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          • #6
            Re: 1997 Johnson 115 SPL will not accelerate - stalls when put in gear

            Thanks all. The carbs are opening at the same time. I have the manual so I'll read up how to adjust the lynk and sync. Do you guys think it could be the power pack? We have never messed witht the timing, etc but at this point I'll try anyting.

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            • #7
              Re: 1997 Johnson 115 SPL will not accelerate - stalls when put in gear

              could be a power pack or a coil - but check the free stuff first ya know?
              grab a spark tester from one of the parts houses and make sure you have good spark and itll jump a 7/16" gap on your tester (testers are only about 5-6 bucks and worth every penny )

              look for one like this at autozone advance or o'riely's napa will be slightly more expensive but they have em too
              http://cgi.ebay.com/ebaymotors/IGNIT...motiveQ5fTools

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              • #8
                Re: 1997 Johnson 115 SPL will not accelerate - stalls when put in gear

                Just to confirm - If I have a good spark on each plug I can assume the powerpack and coils are good?

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                • #9
                  Re: 1997 Johnson 115 SPL will not accelerate - stalls when put in gear

                  If the spark will jump a 7/16" air gap, is bright blue and makes a snapping sound your ign system is good.

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                  • #10
                    Re: 1997 Johnson 115 SPL will not accelerate - stalls when put in gear

                    Thank you everyone. I'll test the spark first then go from there. I hope you all are able to enjoy the water this holidy weekend. Think of our troops this weekend. Good night.

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                    • #11
                      Re: 1997 Johnson 115 SPL will not accelerate - stalls when put in gear

                      Update- with questions.

                      I followed everyones suggestions and we are still having the same problem.

                      I purchased the spark tester this morning. The spark clearly jumps 7/16 however the color is more white than blue (not sure if this was becuase it was sunny outside and hard to see) The spark was the same on all 4 plugs. I assumed this translated to a strong ignition system and moved back to checking the fuel system.

                      I followed the following instructions - please see notes inserted:

                      first make sure the throttle lever & cam yoke are the specified 4 31/32 inches apart as in the first pic. *****Does this apply to all motors or only the 70 horse johnson model that was listed in the link? I am working on a 115 SPL johnson.

                      Then take the airbox cover off and make sure that all three throttle butterfles are closed at idle and parallel thoughout their range of motion. Adjust the WOT stop screw if needed to be sure they end up perfectly horizontal (not beyond) at WOT.
                      ***Butterflies were closed tight at idle and were perfectly level at WOT.

                      Use the idle set screw to set the idle at about 950 RPM with the motor idling in neutral (lower unit submerged). Set it at around 1100 with the motor running on muffs -- backpressure on the underwater exhaust drops it by a couple hundred -- you have to fine-tune it at the lake.
                      ***Done

                      There's a thumbwheel on the throttle cable just inside the cowling; adjust to where the throttle lever moves between the Idle & WOT stop screws, with neither of those so far in, or so far out that there's no room for fine tuning.
                      ***Looks to be good

                      You need to make sure that the motor shifts into gear *before* the throttle lever moves the timer base, which increases RPMs.
                      ***Confirmed this is working correctly

                      This is the crucial part: the throttle cam has to hit the cam follower roller right on the mark. You can see a screw in a slot just below the roller -- that lets you move the roller forward or back to line it up with the mark on the cam.
                      ***There is a little arrow on the cam and the roller is sitting perfectly in the center

                      After all this I decided to replace the fuel pump. $100 guess but figured it was worth a shot to get on the water this weekend. No luck.

                      Interesting notes. When my father-inlaw drives the boat (it will go into gear and barely move with no problem - slower than trolling) If I open the carbs manually it bogs down and dies basically the same thing happens from the remote when you give it gas in gear - bogs down and dies.

                      In neutral we can rev it up - no problem.

                      I am thinking the timing is the next thing to have checked. The problem is it runs great in neutral - wouldn't sound horrible if the timing was off?

                      Back to the ignition - does a white arch vs a blue arch indicate a weak current relating back to a possible bad power pack? How would I tell if out power pack has a slow mode and would that cause the engine to stall out?

                      I believe the stator is fine since the amp gauge is pegged when the engine is running - charging.

                      The carbs on this motor are very basic - there are no screws to adjust it.

                      I apologize for the novel but wanted to make sure everything is listed. I appreciate any suggestions. Thanks!

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                      • #12
                        Re: 1997 Johnson 115 SPL will not accelerate - stalls when put in gear

                        Just a thought, when you move the carb linkage by itself it will stall because the timing is not being advanced at the same time. Have someone move the control and see if the timimg advances with the throttle linkage.

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                        • #13
                          Re: 1997 Johnson 115 SPL will not accelerate - stalls when put in gear

                          Daviet - can you tell me how to tell if the timing is advancing? I do not see any screws to adjust the timing?

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                          • #14
                            Re: 1997 Johnson 115 SPL will not accelerate - stalls when put in gear

                            Without a manual in front of me the best I can do is guess. Follow the throttle cable on the engine and look for a lever or link that goes up towards the flywheel. When you advance the throttle, another lever or link should advance a plate under the flywheel, advancing the timing.

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                            • #15
                              Re: 1997 Johnson 115 SPL will not accelerate - stalls when put in gear

                              That is what I thought. Everything is in synch. Motor goes into gear first, then the throttle and timing advance in sync. Starting to lean more towards the power pack. T o adjust the timing I'll have to pull the flywheel and special tools are required. It may be time to call a mechanic. Will to check/try anyones suggestions. thanks

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