TW 125 starting problem
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  1. #1
    Junior Member tw125's Avatar
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    My TW 125 is not starting up and I'm having trouble locating the problem.



    I press the ignition switch and the only form of life comes from the starter relay clicking. The battery is charged to capacity (verified by a multimeter and full bright light when using the ignition).



    Wondering if anyone has any ideas or past experience with this kind of problem?

  2. #2
    Senior Member Rainman's Avatar
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    Mine did that and it was the battery. My light would come on too, but it wasn't enough juice to turn the motor over.
    If you can't find it, grind it

    1990 TW200

  3. #3
    Senior Member uktw125's Avatar
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    Connect your multimeter to the battery, voltage should be over 12V, then turn on, press the starter and see what the voltage drop is. If it goes down to 9-10 volts it's the battery.

    Also check the terminals are clean and tight.



    When you have fixed it don't just disappear, let us know because it helps other with a similar problem.

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  5. #4
    Junior Member tw125's Avatar
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    I'll do the test ASAP and get back to you guys with the results.

  6. #5
    Junior Member tw125's Avatar
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    Results = 12.5v across the terminals awhen ignition not pressed. When I turn on the ignition it drops to 12.05v. Which means the battery isn't the problem right? I've decided to buy a new battery anyway because the - terminal has all this white crap all over it which can't be good.

  7. #6
    Banned qwerty's Avatar
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    All that white crap is corrosion, easily cleaned off with baking soda paste and an old tooth brush. That white crap just might be the problem.




  8. #7
    Senior Member uktw125's Avatar
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    New batteries should be charged fully before use. It will be stronger and last longer.

  9. #8
    Junior Member tw125's Avatar
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    Long story short, the starter motor was full of oil. I need to buy a starter motor, anyone know of any websites that sell TW 125 parts?

  10. #9
    Junior Member tw125's Avatar
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    Could I replace the starter motor with one from a different Yamaha bike? Because the XT 125 starter motor looks exactly the same as a TW 125s.

  11. #10
    Senior Member uktw125's Avatar
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    Quote Originally Posted by tw125 View Post
    Could I replace the starter motor with one from a different Yamaha bike? Because the XT 125 starter motor looks exactly the same as a TW 125s.


    I don't know about the newer XT125's with electric start, I think they have a different design of engine.

    (I may be wrong there)

    But if your looking for second hand I am fairly confident that an SR125 starter will work or an XT225 Serow.

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