VFR800 Charging problem

Im a bit confused after reading a lot of threads so, heres my problem.
My VFR800 is an 2007, everything worked perfect until my bike stayed 3 weeks. So after 3 weeks, i saw that she cant keep the voltage up as she did after i parked her 3 weeks ago.
Voltage stay at 12.4v at idle and 12.7-8v at 5000rpm, but after a while of riding, my voltmeter read constant 12.6-8 at idle and 13-13.1v around 5000-6000rpm and sometimes jump for some seconds/minuts to 14.5-14.8v as she was working before.
I checked stator and r/r connections, all looks good without burns or something. I tested R/R with multimeter, it was 0.368 on diodes and stator gave me 0.01 ohm.

What could be wrong? What should i check further? I didnt had any problem with other electrical components.
P.S: when i started her after 3 weeks, she turned a bit hard(not instantly as its did or doing now) and dashboard got off for half a second. Battery had 12.8v and usually when i check, battery keep voltage around 12.8-13v even after 1-2 week.

 

R/R is SH847FA or something like that, its not SH847AA.

 

From that description I strongly suspect your stator is failing - whether this has also killed the RR is not clear but I would definitely consider running through all the checks in the "Drill".

To confirm if the Stator is the problem you have two options (1) get the multimeter out and carry out AC output tests across all three legs of the stator both hot and cold at idle and at 4,000rpm. The process is explained better in "the drill". Or option (2) - which is what I would do - is simply unbolt and look inside the stator cover. If you are greeted by the classic smell of burnt electrical windings or see deep brown sections on the stator then it will need replacement - OEM is the way to go as aftermarket stuff can be decidely unreliable, and you should definitely check output from your RR once the stator has been replaced. Obviously if the stator looks like new then you have pretty much ruled out the stator as faulty, for the small cost of a new gasket.

Good luck let us know how you get on.


SkiMad

 

Sounding a bit like a battery problem...... how old is it and do you keep it on a tender when parked? I'd suggest getting it load tested to really tell the tale.

 

Battery is 4 years old, i tested it under load and is going 10.8v when i start the bike.

 

I checked the first one, all 3 wire gave me around 18-20v at idle and up to 64-70v at 5000rpm.

 

So the COLD stator output looks OK - but have you also checked the stator output when it is HOT?

IE after it has been for a decent ride 20+ minutes by which time the stator and other electrical components are hot and any heat related faults become evident. Sadly insulation on the windings in the stator will degrade over time and use and potentially fail when hot shorting the AC output across the affected legs so instead of charging the bike it can suddenly create a drain on the charging system and quickly discharge the battery and leave you stranded.

However I see you have now revealed that the battery is 4+ years old - so it is already living on borrowed time and I would bite the bullet and get a replacement now, as accurate charging system testing results requires a healthy fully charged battery, and a failing battery can produce misleading test results.

 

Actually, the values start to change to normal for short time when its running for about 15-20min. But it is not something concrete, sometimes i read normal value when she is cold.
About battery, it was my first concern after i saw the date on her, but if she was cold dead, wasnt suppos to lose voltage in some hours/days and going unde 10v at start ?

 

12.4 volts is pretty much the tipping point where a motorcycle battery needs replacement. If you are looking for further advice about batteries please delve into some of the links listed on this website - as they really are experts in Motorcycle batteries.. https://www.whitedogbatteries.com/wdblg/battery-faqs/#faq2