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25 hp yamaha 2 stroke Shift linkage adjustment I need help

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  • #1

    25 hp yamaha 2 stroke Shift linkage adjustment I need help

    Hello All
    I have a 2008 yamaha 2 stroke 25 hp outboard 25MSH 6L2K 1040491

    I needed to change the water pump impeller, So I changed the impeller.

    When putting it back together I seem to have got the Shift adjustment out.
    I originally had to remove the shift lock nut to remove rod coming down from tilt area. after putting this back my neutral is not specific its either rev or Forward and it starts in Gear !!!!! so now I got it all out anyone have a step by step how to get it all back in proper adjustment. I have NOT touched any linkage above that Linkage nut, the engine is a Tiller Steer model with shifter on front of the motor.

    thanks for any help in this matter......

    Thanks in ADVANCE !!!!
    Coconut Sunrise
    Last edited by Coconut Sunrise; 10-13-2013, 02:15 PM.
    Tags: None
  • #2
    ok.
    we will start by clarifying one thing, there is NO linkage adjustment on that 25 HP shift.
    I will repeat, NO adjustments.
    its either assembled correctly or its not.

    now undo the barrel nut again.


    easiest way is to shift the case into rev while rotating the prop.
    back the barrel nut off high enough to shift the shifter into rev.
    then thread the barrel nut down to engage about 5-8 threads of the lower shift rod. now hold the barrel nut and tighten the jam nut.
    if done correctly you will now have full range shifting.

    remember all disassembly and reassembly is done in rev.

    Comment

    • #3
      Thanks Rodbolt !!

      To be clear

      1) pushing the shift cam down while turning the prop will engage the foot into reverse.

      2) Then Put foot on to motor Alining the drive shaft.

      3) once foot is in place push the shifter at the tiller into rev gear to allow Ferrel nut drop low enough to engage Shift cam rod going to foot.
      5-8 threads onto cam shift rod then lock the Jam nut.


      Also what is the Spring loaded rod coming from the tilt area For ?

      Going to give it a try to see what happens

      THANKS !!!

      Comment

      • #4
        If the shift linkage is not assembled correctly then isn't an "adjustment" needed to get the linkage assembled correctly?

        But I would agree with the procedure. Lower unit in reverse gear and shift lever in reverse gear. Run the barrel nut up the shift rod. Run the jam nut down the shift cam assembly.

        Install the lower unit. Run the barrel nut down the shift rod until it is half on the shift rod and half on the shift cam assembly. Position the shift lever into forward gear or wherever it needs to be to get access to the jam nut. Run the jam nut up until it is tight.

        Test for proper forward, neutral and reverse gear operation.

        Comment

        • #5
          Thanks Rodbolt17

          That was the ticket it worked great and shifts as it did pre-OP thanks for your info take it apart in reverse and put it back in reverse

          Thanks

          Coconut Sunrise ~~~

          Comment

          • #6
            that spring loaded rod that clips under the jam nut is the reverse lock.
            keeps the prop from climbing out of the water in reverse.

            Comment

            • #7
              This is an old thread I know but im running to the same problem stated here. The barrel nut is the large brass nut coming from the engine correct?

              Comment

              • #8
                Yes it is a bronze/brass nut on the shift rod just above the lower unit. Follow the instructions given above in this thread and you shouldn't haven't a problem disconnecting and connecting it back up. Sometimes you may have to go a turn or two one way or another to get the engine shift correctly.

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                • #9
                  So I followed the procedure above and now no matter where of how I adjust it it will not stay out of forward

                  Comment

                  • #10
                    Take the lower unit back off, check and see if it shifts properly, be careful not to pull up too hard on the shift shaft when doing this as you don't want to pull it out of the gear case....that is not good.

                    If the lower unit shifts properly when off the engine then reinstall it following the exact instructions that was given by Rodbolt earlier in this thread.

                    What work was done to the lower unit when you had it off previously?

                    Comment

                    • #11
                      I replaced water pump today on a 2008 25 msh.
                      Am now having similar problems. It sounds like it can’t find neutral.
                      When I spin prop by hand I hear a slight noise. When I crank engine it is louder.
                      Do I have to pull the foot entirely off to start this adjustment procedure. It’s all bolted up.
                      I can’t quite understand the instructions above.
                      Any clarification would be much appreciated!!
                      2003 Seapro 2003 Yamaha 90 2 stroke w/oil inj.

                      Comment

                      • #12
                        I will add that this is a very low hours engine.
                        This is the first time it’s been apart and impeller did not look bad.
                        2003 Seapro 2003 Yamaha 90 2 stroke w/oil inj.

                        Comment

                        • #13
                          is that a push pull or twist shift motor?

                          Comment

                          • #14
                            Push pull.
                            Lever up top front of cowling.
                            2003 Seapro 2003 Yamaha 90 2 stroke w/oil inj.

                            Comment

                            • #15
                              From Rodbolts post above....start over.


                              "now undo the barrel nut again.


                              easiest way is to shift the case into rev while rotating the prop.
                              back the barrel nut off high enough to shift the shifter into rev.
                              then thread the barrel nut down to engage about 5-8 threads of the lower shift rod. now hold the barrel nut and tighten the jam nut.
                              if done correctly you will now have full range shifting."

                              Notice he said 5-8 turns....its not exact so a little trial and error is required. If you hear clicking while spinning the prop in neutral then it's still slightly out of rig. Try turning the barrel nut one turn at time either way until the clicking is gone..there is a sweet spot there.

                              Comment

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