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Will not start, flywheel turns slow with starter

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  • Will not start, flywheel turns slow with starter

    Have a 2002 Mercury 125hp, 2 stroke.
    I have read several forums and have done it all, but flywheel continues to run slow.

    facts:
    - replaced the starter (brand new)
    - runs at OK-speed without spark plugs
    ​​​​​​- Easy to turn the flywheel with hands without the spark plugs.
    - tested the solenoid - ok
    - brand new battery (multimeter shows 12.7v, so it was charged)
    - I used jumper cable to direct connect to the starter and still runs slow.
    - used the pull cord and really think it is hard to turn.

    What am I missing? Why it runs slow (hard to turn)?

    Thank you for your help.

  • #2
    Dont know too much about outboard timing, but i had an old dodge that turned reall hard. Especially when it was warm. The timing was too advanced. It was firing when the piston was on the way up. Making it turn real hard.

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    • #3
      Originally posted by gbarbosa1982 View Post
      Have a 2002 Mercury 125hp, 2 stroke.
      I have read several forums and have done it all, but flywheel continues to run slow.

      facts:
      - replaced the starter (brand new)
      - runs at OK-speed without spark plugs
      ​​​​​​- Easy to turn the flywheel with hands without the spark plugs.
      - tested the solenoid - ok
      - brand new battery (multimeter shows 12.7v, so it was charged)
      - I used jumper cable to direct connect to the starter and still runs slow.
      - used the pull cord and really think it is hard to turn.

      What am I missing? Why it runs slow (hard to turn)?

      Thank you for your help.
      You should post your question in the right post

      When you said; "I used a jumper-cable" what are you jumping?
      Last edited by may the force be with you; November 9th, 2019, 08:25 PM.
      "Success is walking from failure to failure with no loss of enthusiasm." - Winston Churchill

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      • #4
        Originally posted by Holy Shamolee View Post
        Dont know too much about outboard timing, but i had an old dodge that turned reall hard. Especially when it was warm. The timing was too advanced. It was firing when the piston was on the way up. Making it turn real hard.
        FYI
        the Firing always occurs on the way up, the timing is BTDC
        "Success is walking from failure to failure with no loss of enthusiasm." - Winston Churchill

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        • #5
          Yes it always fires on the way up. But sometimes the timing is to far advanced.

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          • #6
            we are discussing engine problems in the wrong post, maybe the mods. can move it
            "Success is walking from failure to failure with no loss of enthusiasm." - Winston Churchill

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            • #7
              Actually, the idle pickup timing for your ignition system should be slightly After Top Dead Center, if set correctly. Your ignition system idle pickup spec would be 0-9* ATDC.

              To rule that out, turn ignition off at the keyswitch, and jumper the starter solenoid and see if she still turns slowly.

              I agree that this should be moved to the Mercury OB repair Forum.

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              • #8
                I would suggest that at 12.7 volts, your battery may not be fully charged. Should read about a volt higher.

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                • #9
                  Remove & test the lower unit !!------The problem could be a seized lower unit.-------Drain oil and have a looky.

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                  • #10
                    Originally posted by may the force be with you View Post

                    You should post your question in the right post

                    When you said; "I used a jumper-cable" what are you jumping?
                    Sorry about where I posted, new to this.

                    Regarding what I jumped, I connected the battery directly to the starter, but it still ran it slow.

                    Thank you

                    Comment


                    • #11
                      Originally posted by ahicks View Post
                      I would suggest that at 12.7 volts, your battery may not be fully charged. Should read about a volt higher.
                      Besides using the multimeter to check the voltage. I have a battery tester device and it said that it was at 98% charge.

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                      • #12
                        Originally posted by racerone View Post
                        Remove & test the lower unit !!------The problem could be a seized lower unit.-------Drain oil and have a looky.
                        Without the spark plugs, I can turn the flywheel with my hands, easily. Do you still think it can be the lower unit causing the flywheel to be hard to turn?

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                        • #13
                          Originally posted by gbarbosa1982 View Post

                          Regarding what I jumped, I connected the battery directly to the starter, but it still ran it slow.

                          Thank you
                          Are the battery-cables in good condition? are the terminal clean & tide?

                          IF that's okay, I'm leaning toward a "weak" starter (even new, they can be crap)
                          "Success is walking from failure to failure with no loss of enthusiasm." - Winston Churchill

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                          • #14
                            This should be easy to figure out !

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                            • #15
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                              Originally posted by racerone View Post
                              This should be easy to figure out !
                              Exhaust plugged lol
                              "Success is walking from failure to failure with no loss of enthusiasm." - Winston Churchill

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