thunderace wrote:

Neosophist wrote: But... 75v @ 5000rpm is high for the generator. It should be 50v.

I wouldn't worry about that if he's using a Yamaha reg/rec. All Yamaha 4 strokes kick out around 75Vac at 5k rpm and the reg/recs are designed for it.

Mine kicks out the near the same on each phase. Do you think it's possible that the spec was changed when the later genny was fitted in the factory? ie; the earlier one kicked out 50V and the later 75V to bring it in line with everyone else?

Not tested an earlier style one..only the later one which is the same as the NC30 one, which outputs 50v @ 5000rpm according to the Honda workshop manual, it says it should be replaced if its out of spec...

Every NC24 / NC30 / NC35 i've worked on has outputted circa 50v @ 5000rpm.. anymore than that would be of concern to me as it would be a different value.

Especially if there was a new reg/rec fitted fairly soon and it has died already...

But then again I do have a good multimeter and digital tacho...

The only thing I could think why it is 75v is that your tacho is out and your measuing the voltage slightly higher than 5000rpm, which in this case isnt such a problem :)

Is it 75v across all the phases..?, the voltage should be uniform across each phases.. that's the main thing.. as any one phase higher / lower than the others would indicate a failure.

If it's uniform just go with the R6 reg/rec and measure voltage at battery at idle and at 5000rpm :)

Mine reads 72-73V across all three at 5k. Every Jap bike I've owned has read in the region of 70-75v at 5k so this 50v thing is really confusing me

My 24 is running fine at the moment, absolutely no problems at all. Just need to get it MOTd and back on the road.

http://akhara.com/nc30/nc30manuals/VFR4 ... 0R_C15.pdf

NC30 charging system inspection.

This can be used on the NC24 too as the NC24 (albeit the very early RH-I models) ship with the same generator as the NC30.

http://www.motorcycleinfo.co.uk/resourc ... _Chart.pdf

Electrexworld (maker of regulators / generators) troubleshooting guide.

Having had a quick look at the diagonstic guide above (which quotes at least 50v) and a search on google (50v @ 5000rpm) there are a LOT of references to gennys putting out 50v AC @ 5000rpm, which is what all of the ones i've worked on have put out, and what i've always worked too, I believe the Haynes manual quotes 50v too, as well as my kawasaki manual (i think that quotes 40v at 4000rpm)

They dont' give any maximum voltage and the Honda shop manual doesn't even test the voltage. Just the resistance.

Personally, I've never seen one put out over 55v at 5000rpm.

However, from what I can read though, as long as all the phases are equal voltage and the resistance is low and there is no resistance to earth it'll probbaly be ok.

I haven't forgot to complete this Thread.

Got the R6 reg/rect - modified wiring to fit.
Haven't been able to start bike to test

Got new Tanya Battery as recomended but after having fuel problems I think I drained it trying to start, so charged with my Halfords Trickle Charger but cannot get it past 12.3v which I know is only about half charged

So not sure if my charger is buggered or the new battery is faulty, don't have another charger to try.
Tried charging the old battery again - only get it to about 12.2v from 11.3v after about 10 hours (charged overnight)

The red light turns to green on the charger - charging to maintenance at just over 12 volts
Measuring across the new battery when charging with the charger, disconnected from the bike, it read 12.8V - is this enough to get it fully charged?

I thought I would fit the old battery, which might be ok, and start from my car with jump leads(I know, don't start car) just to get it started so I can test the charging circuit to see if fitting the R6 Reg has helped - does this sound ok?

Cheers

That doesn't sound like enough voltage.

Maybe your chargers buggered and not the battery...

Hi...just bought a yamaha R6 rectifier....how do you fit it...do you have or know where i can find a guide?? Cheers Paul

You say you have a spare rectifier...that must mean you knew how to fit the other one lol....any chance of spreading the word?!? Cheers Paul

Try a search mate, plenty of info on here about fitting R6 regs.

Good starter:

viewtopic.php?f=24&t=13921&hilit=fitted+r6+reg

Neosophist wrote:That doesn't sound like enough voltage.

Maybe your chargers buggered and not the battery...

Yeah, could also be a dud battery. Seen thsi happen if the battery is too old or was opened and used while sitting on the shelf.

As Neo said that's not enough voltage!

ARRRRRRGGGGGGGGGG!!!!!!

Just a bit annoyed.

Bike used to start fine and would run - didn't hold it's charge so long journeys were out of the question
BUT
Now after all the investigation - checked Stator - all details in this thread, modified to take R6 Reg/Rect and now the ba****d will not start.

Last night - Used jump leads - connected to car - still no start.

Would anything I did with the Reg/Rect cause a starting problem, I suppose what I'm asking is if the R6 reg/rect is faulty would this cause a starting problem, I thought if it didn't work right it would just be a charging problem again and not a starting issue or maybe something else has gone wrong.

I think I'm destined not to ride this bike - maybe a good thing with these icy roads