Question about 2003 Yamaha YZ 125

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Fit a new r/regulator to my vfr 750 honda which cured my battery charging problem, but after two weeks it was flat battery again and when i checked the output it was charging at 14to15volts even on tickover instead of 12v on tickover.

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FAULTY REGULATOR

Posted on Aug 04, 2010

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1 Answer

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Checked your voltage regulator lately?
the 750 very motor was known for that problem

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The bike probably has a faulty charging system. Need to check regulator/rectifier for proper operation as well as the stator's output voltage on all 3 phases. They usually blow out the regulator though.

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Overheated battery my 99 vfr 800 recently suffered from a overheated and cooking battery, and the whole electrical system faded out, and the bike impossible to start. Strong smell of sulphur. New battery...


Your voltage regulator is bad. She is over-charging. From your description, when this happens the charging system is putting to much voltage/amps back into the battery. The regulator senses battery voltage and then cuts back the amount of alternator output.

Sep 18, 2011 | 1999 Honda VFR 800

1 Answer

I stored my honda vfr 800 for two years. When I tried to start it, it would not start. It used to work alright before storage. It is quite new. What might be wrong with it?


Have you charges the battery? Is it turning over at normal rate. Have you put fresh fuel in it. 2 year old fuel will present a problem.
Mine would die and it turned out that the regulator / rectifier was shot also it buggered the alternator so need all new bits.
Common misconception is that it's just a faulty battery but can be more serious. Get a sparky to check it out.

Feb 28, 2011 | 1998 Honda VFR 800

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My vfr 800 battery went flat after riding it 100 kilometers,the battery is only 2 months old.


You need to replace the voltage regulator. That's the first thing I would do.

Hope this helps.

Nov 05, 2010 | 1999 Honda VFR 800

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if regulator is disconected the battery cant charge when running.

Apr 04, 2010 | 2003 Honda VFR 800

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What fork oil do i need for my honda vfr 750?


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Aug 23, 2009 | 1994 Honda VF 750 C Magna

1 Answer

When I check the voltage et the battery with the motor running it gives me a good 13.8 volts at about 3000 rpm, but I have a problem that after about 2-2.5 hours of riding I end up with a flat battery. I...


hi ,this might help.i think your voltage regulator might be kaput or your generator,,13.8v is the static charge of a 12v battery,with the bike running at about 3000rpm you should be getting between 14.2 and 14.8v,the way to test your voltage regulator is to put a meter across the battery with the bike running and switch your lights on the meter should dip momentarily then return to its normal reading if it is not reading at least 14.2v with the lights on the regulator is faulty,,hope this helps

Jul 30, 2009 | 1999 Honda VFR 800

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