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Discussion Starter #1
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?
 

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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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Discussion Starter #5
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.
 

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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.
 

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Discussion Starter #8
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?
 

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Discussion Starter #9
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.
 

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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.


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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