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Troubleshooting Starting Problems on Yamaha 100 F

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  • Troubleshooting Starting Problems on Yamaha 100 F

    Hey gang,

    I'm a novice when it comes to electrical, but I wanted to see if I could see if someone else has had the same problem. So here goes:

    Yamaha 100 Four Stroke
    New Battery
    New Solenoid
    Supposedly rebuilt starter in the past
    Good clean connection from wires to battery and to engine

    Problem:
    When I try to start it, it does not click, make any strange sounds, just sounds tired - like it's trying to turn over but just doesn't have enough "oomph" to get there.
    If I put the battery on charge, connect it to the cranking battery and crank it,- it starts like it should. Will run around the lake just fine. Then, when I get back, turn it off and go to start it again - nothing.
    I usually check the battery to make sure it's topped off. Sometimes just trying to start it with no battery charger connected, it will suck down the battery by about 10 percent - to 90 percent. Then, once I top it off, hook up the charger - it cranks right up.
    Also, if I set another cranking battery next to the one that's hooked up and use jumper cables to give it extra juice, it cranks right up too.
    I can yank off the starter and have it rebuilt, but why would it work fine when there is extra juice, but not on a good 800 amp battery with full charge on it's own?

    Any advice, similar problems that have been corrected, would be appreciated!!

    Mike


  • #2
    Re: Troubleshooting Starting Problems on Yamaha 100 F

    Sounds like bad battery or bad connection, you have to hook something up bypassing the connection to make it work.

    Voltage drop test under load should show where the problem is

    Comment



    • #3
      Re: Troubleshooting Starting Problems on Yamaha 100 F

      What size battery did you buy?

      Comment



      • #4
        Re: Troubleshooting Starting Problems on Yamaha 100 F

        Originally posted by Silvertip View Post
        What size battery did you buy?

        It is an Interstate 800 amp battery. It was the biggest I could locate in my area. Shows good charge and cranks my other boat (with a bigger motor) just fine. I think I'm getting robbed of power somewhere in the system.

        Comment



        • #5
          Re: Troubleshooting Starting Problems on Yamaha 100 F

          I found the problem. Starter was hot to the touch with little cranking. Took it apart and some fiber insulation had come unraveled and looked like a black birds nest inside. Cleaned it up and we're off and running.

          Thanks.



          Originally posted by 99yam40 View Post
          Sounds like bad battery or bad connection, you have to hook something up bypassing the connection to make it work.

          Voltage drop test under load should show where the problem is

          Comment

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