5th Gen, volts query after new RR install

Hi All,

I am scratching my head, my VFR800FI 2001 after a long ride and stopping at the petrol station, did not enough charge in the battery to even make it click.

So I test the regulator, which seemed fine.

So I search this forum, read all I could find and have checked the earths, wiring for burning, stator check for Ohms fine etc. All good. 9Didn't do a AC voltage check on it because I don't know how).

I retested it an it was the same result! At about 108 degrees and the charging volts dropped off (at any revs). I am guessing this is cuasing the flat battery.

So I got a new voltage regulator and it seems ok...BUT

...Although again at 100-103 degrees at idle te voltage drops to about 12.8 volts, only difference is reving upto 5k takes it back to ~14 volts.

Is this normal or am I missing something, am so confused and am hoping I don't need a new Stator as well.

Any thoughts?

Dallas (Australia)

 

Slaps forehead!

Urm about 100 degrees is when the dual radiator fans kick in. I am guessing with that load it'd be fair for the voltage to drop from ~13.5 at idle to !2.9 volts.

Think I might have this one nailed. Better wait until morning for a long long test ride

 

If you have a multimeter go through this chart to test all the components.

http://www.electrosport.com/technical-resources/library/diagnosis/pdf/fault-finding-diagram.pdf

 

Normal.

Discharge at near idle speed is normal; voltage increases with speed.

 

Hello, I also just replaced the voltage regulator on my 96 VFR. The system was not charging so I followed the service manual which help me verify a bad regulator. Well, now the system charges at 14.2 V @3K rpm. However, at that RPM the regulator feels hot to the touch. How hot should the voltage regulator get? I'm a little worried about the temperature as I don't know what is considered normal. I already emailed the company (RM Stator) asking for a temperature specs. Would applying some heat transfer compound on the regulator to frame surface help dissipate some of the heat over to the bike's frame?

HRCH

 

The heat sink compound is a good move. I did that and a computer fan on the R/R as well. Its about a 3x3 inch fan that draws .15 amps. I strapped it to the R/R with just wire ties and wired it into the license plate light. Dropped the temp from 150deg F to just over 100 deg F via an infrared thermometer when idling for 5 minutes with the high beam on. Find an old computer and get yourself a cooling fan.