Reg/rec dying? UPDATE: I give up for now!

[Turkish]

So I have one week left of my CBR but there is a developing problem I'd like to sort before I try and sell it.

At first it started with a wobbly temperature sensor at high RPM - cleaning contacts and checking connections revealed nothing.

Battery charging has been getting worse - It only turns over very very slowly now - a night on the Optimate and it is fine (for a day or so...).

I disconnected a headlight to reduce battery drain - this helped for a while.

A new symptom yesterday was flashing headlight with the indicator going, even at fast idle.

Is the reg/reg dying?
Are reg/recs from any other bikes compatible with this one? I need a bargain!
Does anyone have one for sale!?
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ZX-6R G2
CBR125R RW6

[Wafer_Thin_Ham]

Check you've not got a dodgy earth first. That can give all sorts of weird symptoms.

Then check with a multimeter to see if your reg/rec is fried.
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My Flickr

[Islander]

As above. You need to use a multimeter to find out exactly what's going on in the charging circuit. It could easily be something other than the reg/rec.

[stevekingchef]

Hi

Depending on comparability I ordered a reg rec for my cbr 929 2001 bike when I don't need it ,

If compatible pm me!

[Turkish]

Ok so I did some testing

Across battery, engine running, idle - 7.7V
Increasing the revs to around 4-5k brings the voltage to around 13.5V, anything higher and it begins to drop again.

Across terminals (no battery), engine running - 7.7V
Same performance as above.

Across battery alone (disconnected), 10.5V

Battery currently on Optimate 'recover' program, although the way things have been going today, I think I may have killed it.

Other testing

Stator wires all ~0.5R to each other (limit is 0.6) measured at the reg/rec connector, all wires open circuit (> 20GR) to ground.

Earth points checked - not too high resistance (still around 1R) but I cleaned them up anyway.

Reg/rec wiring connector at the stator was a bit corroded, cleaned the male and female contacts.

Checking the reg/rec itself I'm reading one diode forward biased between each stator wire and the +12V, and one diode reverse biased between each stator wire and ground. I have no idea if this is normal - it kind of makes sense.


What next?
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ZX-6R G2
CBR125R RW6

[Turkish]

OK another quick update.

With the battery disconnected and IGNITION OFF I'm reading open circuit between the terminals (> 20 GR)

With IGNITION ON I'm reading 90 R? That seems excessive! Could be internally shorted ignition switch, maybe?
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ZX-6R G2
CBR125R RW6

[Turkish]

Nevermind that resistance appears to be the internal resistance of the ignition circuit, not the switch.

Also, my battery has moved from 'recovering' to charging! Which is good news!

Worst case scenario, I'll use the battery to start the bike and then disconnect for the ride - at least I won't have to bump it any more.
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ZX-6R G2
CBR125R RW6

[Turkish]

So I slept on it and did some more today. I put the battery from the ZX on the bike (with some custom jumper leads as the battery is too big to fit ) as the CBR's battery is fucked - Optimate couldn't save it.

Starter fuse only (no lights etc) at idle I'm getting ~14.4 volts across the battery. Drops a little with revs but not below 14.

With the other fuses in (lights on) I'm getting around 12.5 volts which again drops a bit with revs. That's not good.

I tested the voltage coming out of the stator, with the battery connected as lights off I'm getting around 11 VAC phase-to-phase, which drops to around 7 VAC with revs.

Also I noticed that charge current is around 1A to the battery at idle, less than half of that at revs. That doesn't sound right!

I can't think of a way to test the stator unloaded - the bike cuts out if you disconnect it.

What do you think, should I order a new stator (and battery )?
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ZX-6R G2
CBR125R RW6

[J.M.]

New battery, yes.

You must test the stator unloaded. The bike will be cutting out because the battery is flat. The stator is part of the charging system and there should be no devices making the bike cut out other than insufficient power.

Did you do as Wafer_Thin_Ham suggested? If you have a dodgy earth you'll chuck loads of money at the charging system and not fix your issue.
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2004 R1 & 2018 XSR900

[Clutchy]

Maybe this 'might' help? https://www.bikechatforums.com/viewtopic.php?t=264767&postdays=0&postorder=asc&start=50


Biggest PITA I've ever had was sorting the charging system out on my cbr 125 haha good luck!

If you want to know what any readings are meant to be, just PM me and I'll take them off my bike.
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Malaguti F12 Phantom-Dead, Suzuki AY50- Dead, NRG power DD LQ, CBR125.
*33 BHP restriction up on 10/12/14* Current bikes/car: SV 650 S/ MKIV GOLF
Guide to pass your test with no lessons!

[Turkish]

Hi Clutchy, yeah I saw your thread Will check wiring to ignition...

JM I managed to test the stator unloaded. Bike cuts out because the pulse coil generator is in the same connector. Pulled those out and connected them on their own.

Output of stator around 18V at idle, all phases. Increases with revs to 40+ (stopped at that point).

Voltage at battery is around 12.4V with no stator connected.

These numbers don't really mean anything to me.
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ZX-6R G2
CBR125R RW6

[J.M.]

Ah I didn't see that part. Bloody CBR125s. Other bikes I've played with have the stators and the reg/recs separate!

40VAC sounds healthy for around ~4-5k RPM. In which case I wouldn't suspect the stator to be the issue. The idle voltage seems low though. I'm not sure what to comment on those readings (hopefully someone else can) as the idle seems too low to me but at RPM it seems healthy.
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2004 R1 & 2018 XSR900

[stonesie]

If all phases of the stator are equal then it's fine, try a replacement reg/rec, my daytona is running one from a ZX6R P7F (2007/8) which is a mosfet unit and never even gets warm

[Turkish]

I checked out the loom, seems to be ok.

If I'm honest, the voltage readings I'm getting with the ZX battery are near enough in spec (at 5k rpm the voltage is OK according to the Haynes). And they arent all that different to when I got the bike - I remember them always being a bit low.

I think I'm just gonna stick a new battery on it and see how it goes - it needs one anyway!

Thanks for your help chaps!
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ZX-6R G2
CBR125R RW6