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1991 Yamaha YMF100 Moto 4 Electric Start Issue


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i have a 91 moto 4 100. has electric start only. for as long as i could remember we have always pushed start it. after riding for while you shut it off. you are able to hit the start button and it will start right up. anyone know where i should start with fixing this issue? im fixing it up for my niece. thank you in advance.

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  • Ajmboy changed the title to 1991 Yamaha YMF100 Moto 4 Electric Start Issue


  • 3 weeks later...

I know I made a post a little while ago about rebuilding my four wheeler and it having a starting issue. Just a little update. I replaced the battery and starter relay. Neutral light comes on hit start button and relay is clicking. Is it possibly a ground issue? I will be checking voltage later on after work. Just thought I would get a little advice before I get off. Oh also I did run wires from the battery to start to bench test it, it does turn. Thank you in advance for the help. 

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  • Ajmboy changed the title to 1990 Yamaha YFM100 Starting Problems
41 minutes ago, amharrison24 said:

I know I made a post a little while ago about rebuilding my four wheeler and it having a starting issue. Just a little update. I replaced the battery and starter relay. Neutral light comes on hit start button and relay is clicking. Is it possibly a ground issue? I will be checking voltage later on after work. Just thought I would get a little advice before I get off. Oh also I did run wires from the battery to start to bench test it, it does turn. Thank you in advance for the help. 

I merged your new topic with your existing one. If your relay is clicking, I would jump the relay to see if the starter engages. If not, might be a bad starter, poor ground, or loose connection. Good thing is you are getting power to the relay, now you just need to see why the starter isn't getting the power from there.  

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I'd bet the brushes are bad in the starter.  Try holding the start button down and giving the starter a tap with a wrench.  I bet it'll pop right off.  When it's warm, metal expands a bit and I bet the change in tolerances lets the brushes contact.

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