As I was driving home from work yesterday at around 80 km/h, my Yamaha 600TT lost electrical power all of a sudden (all dashboard lights out). At the same time, I also lost engine power, and the motorcycle just stopped moving.

I managed to push it back to the office, but now, it won't even start.

Any ideas on what might be wrong?

Video: https://youtu.be/j_2oPXoTp8k

  • Welcome to Motor Vehicle Maintenance & Repair! – Pᴀᴜʟsᴛᴇʀ2 Dec 13 '18 at 14:20
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    Have you checked the battery voltage and its cable connections? Is that sound when you press the start button normal for the bike? – mike65535 Dec 13 '18 at 14:33
  • The cable connections look good, I have tightened everything up, and bought a multimeter on Amazon. The noise is not OK, the engine normally starts right away. – Maxime Dec 13 '18 at 14:34
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    What's the battery voltage (you said you had a meter)? Can you measure while the bike is just sitting, AND when you turn the key to ON, AND when you are cranking it? – mike65535 Dec 13 '18 at 14:54
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    I bought it, it has not been shipped yet :( – Maxime Dec 13 '18 at 14:58

Since this is a total AND sudden electrical failure it could be due to battery issues AND/OR generator failure. I cannot check your video right now but if you have a spark plug key available, you could try a simple and quick check by removing your single spark plug and rotating the engine with 5th gear engaged and turning the rear wheel. If this movement is not smooth it could be an indication of a fractured generator rotor-coils. After this check you could test your regulator for failure. Locate it and give it a check as show here: https://www.youtube.com/watch?v=-2jWIkhy1fo or https://itstillruns.com/check-voltage-regulator-motorcycle-5475989.html

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