Question about 2005 Yamaha Ybr 125

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Why dose my charging current change

One min its 12.20 up 12.80 with 5000 rpm and drops 11.80 and and other times it dose reach 13.80 thats not right is it any help please

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  • Nick Bridger
    Nick Bridger Mar 05, 2012

    checked charging magneto puts out 27 volts at 5000rpm seems to be working but if i disconect my headlamp it gives me 1410 at 5000rpm

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  • Yamaha Master
  • 3,287 Answers

There may be an intermittent issue developing with your voltage regulator / charging system. Eventually it will fail if not corrected or replaced. Once a lead-acid battery measures 11.7 volts (open circuit) or 10.5 volts (load connected), the battery is considered fully discharged.

You were pretty close to the discharged threshold and if you stopped when it read 11.8 volts, I doubt the battery would have been able to crank over the starter. You should have the charging system checked out.

Posted on Feb 24, 2012

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