Strange things happening.........

[nomoregt4]

Evening folks. Got a slight wee problem with my CBR 600F. The post may be a bit long as I tend to waffle on

Coming home from work on Sat, bike started up fine & rode perfectly back home until I got 1/2 mile from my front door, slowing down for a roundabout, the bike started to run really rough & eventually cut out.

As she was coming to a slow stop, I tried twisting the throttle, but nothing happened. I pushed it into the layby & walked back home.

After around an hour, I went back to my bike with jump leads at the ready, but thought I'll try & start it without the leads first, just in case she fires up, & she did .

Now yesterday I went into town, did a few bits & on my way back, she started to run really roughly, almost 'kangarooing' as I'm riding along & again came to a slow stop & cut out.

This all happened at low speeds by the way (under 30 mph).

I tried to start her again, but all I heard was a very fast clicking noise, which I have now located just infront of the battery housing. (I forget the name of the part )

I waited around an hour for my g/f to come rescue me with a tool box & jump leads. I jump started the bike & thought excellent, I'll get it home at least .

Got about a mile down the road & she started running really rough again. I managed to crawl the 4 ish miles home at 20 mph running again really roughly.

Now my first thoughts was the battery. I've since trickle charged it for 12 hours, tried it today & she started up fine.

But if it was a low battery charge, this wouldn't cause the sudden rough & lumpy running, would it? I thought the battery was initially there just to start the bike & obviously run the electricts after starting.

My brother mentioned it could be the alternator packing up.

The bike is a 1991 with 17k miles on the clock.

Shes been an angel until now

Any help or suggestions would be a great help. Even better would be a helping hand this weekend . I'm based in West Sussex, near Haywards Heath. I make a nice cuppa......

Rich

[The Artist]

I know nothing of your bike but by the sound of it I would say an electrical fault. Possible the coils as they heat up becoming a bit intermittent.

Check them for visible damage. That is if you have coils!

[finpos]

Those CBRs are notorious for having wonky ignition when the battery is weak, usually they just won't start despite the engine turning over at some clip. If I'm not wrong the battery has to run both the ignition and a fuel pump.

So you may well have a tired battery. If it's a few years old then almost certainly so. You should also check that the battery is charging when the bike is running (look for approx. 14V across the battery terminals). If it's not charging, then more likely a fault with the reg/rec or wiring than with the alternator.

f.

[steo]

i would agree with finpos, i'd say your reg/rec or generating coils are fcuked but most likely rec/reg. the bike is running off the battery to generate the power for the engine & as soon as the battery starts to go flat, the bike begins to run crap. when you leave the bike for a while the battery replenishes itself to a certain extent to give the impression that all is well again but a few miles down the road & your back to square one. post a reply if you have trouble finding the reg/rec, plenty of david baileys on here will post a pic of the part.

[Vincent]

Another thing that might be worth looking at is fuel vacuum block. This is when the breather hole on the fuel tank gets blocked up which stops the flow of fuel to the carbs. Easy enough to check, just see if the bike runs ok with the cap slightly open.
____________________
Space Is Deep

[Villers]

As above but you can check it by opening the fuel tank once it conks out and if its under a vacuum you will hear it sucking air in.

My moneys on poor battery performance though
____________________
RS125 > CBR6 > SV650S > ZX636R > GSX1300RZ Hayabusa > 06 RSVR Mille > SV1000S > Street Triple 765 RS

[Rockhopper]

If it was a car it'd 100% be the crank position sensor! Very common for them to fail when they get hot. Not even sure a CBR has such a thing though.

[yuri2085]

Check the battery terminals perhaps? took me ages to check that and it turns out thats what was causing me a lot of probably very similar to yours.
Meaning check they're screwed in nice and tight with good surface for conduction.

[Timmeh]

Another one for the reg/rec.

Get a voltmeter and check the battery voltage with engine at idle, and then at 6-7000 rpm, and blip it to 9k.

12-13v at idle
13-14v at 6k
14.5-15.5v at 9k

Anything less than 14v at 9k and it's prolly had it.
____________________
GSXR400 x2 | '94 RVF400 | '93 TZR125 4DL (again)
20:22:30 BLUEX5: i would love to be forced to undergo a**l plugging with different sizes
20:48:18 Temeluchus: comp you hunk of smouldering homos3x you

[Dezeaz]

Could be a number of things!

I had the same symptoms around this time last year. Bike would kangaroo and cut out sometimes. Checked almost everything on the bike that people suggested on the forums and stil couldnt find the problem.

I checked the FI error codes by shorting 2 terminals in the ECU which was giving an error for the crank position sensor.

Booked it in to a garage who found out it was a problem with the ignition coil pickup sensor.

[veze]

just a thought, maybe a ht lead or ignition coils could be breaking down under tension? id deffo check the battery first though.
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tlm50,mt5,sr50. rs125 extrema, cbr 400rr nc29 suzuki gs500e.Honda cbx250 rs . FJ1200 .fz6,fjr1300

[Bofh5]

Its either fuel starvation or electrics which on the CBR is going to be the reg/rec if mine was anything to go by.
the standard reg is a bit pants and prone to overheating. this will be visible by a melted plastic on the connector block.
there is a really good guide to checking all the various voltages on here somewhere if you do a search.
Cheers
____________________
(L)users...Disk space is to good for them.

Bikes: Honda 50 / CB125-TDC / 93 CBR600 F2 (Stolen & Trashed) / 2001 SP-1 (Sold) / 95 CBR600 F3

[Timmeh]

Just to add what bofh said you can easily get replacement reg/recs for these bikes on eBay or david silver, but buy one with the metal heatsink bolted to it as the crappy plastic ones do have a habit of melting.
____________________
GSXR400 x2 | '94 RVF400 | '93 TZR125 4DL (again)
20:22:30 BLUEX5: i would love to be forced to undergo a**l plugging with different sizes
20:48:18 Temeluchus: comp you hunk of smouldering homos3x you

[Bofh5]

The one i bought was from germany and had a decent size heat sink on and so far no problems with it.
____________________
(L)users...Disk space is to good for them.

Bikes: Honda 50 / CB125-TDC / 93 CBR600 F2 (Stolen & Trashed) / 2001 SP-1 (Sold) / 95 CBR600 F3

[nomoregt4]

Wow, cheers for all the replies guys. I'm overwhelmed

Err, where abouts is the reg/rec located I have since charged the battery & started her the other day, but didn't actually go out for a spin. What is reg/rec short for

I'll get my ass down to Halfords or look on Ebay for a voltmeter & do the suggested tests on the battery.

Again, thanks for all your help, I really appreciate it.

to you all & a virtual beer/larger on me

Richard

[steo]

reg/rec is just short for the regulator & rectifier which is a small alloy box, a bit bigger than a cigarette box with fins on it. it connects into your wiring loom via a junction box connector. it's usually situated near the battery so you'll probably have to take the side casings off to find it. one of the guys will post a picture of what you should be looking for.

[veze]

if its anything like my cbr400, and all the other bikes that ive owned, it will either be behind the left or right rear fairing panel bolted to the subframe. you looking for a small box, like stated before, about the size of a 20 block of fags. it will either be a smooth plastik bock or will have finns in it because of the heat.
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tlm50,mt5,sr50. rs125 extrema, cbr 400rr nc29 suzuki gs500e.Honda cbx250 rs . FJ1200 .fz6,fjr1300

[Bofh5]

its on the right hand side about half way along the seat and has a plastic connector block plugged into it.
____________________
(L)users...Disk space is to good for them.

Bikes: Honda 50 / CB125-TDC / 93 CBR600 F2 (Stolen & Trashed) / 2001 SP-1 (Sold) / 95 CBR600 F3

[nomoregt4]

Nice one, cheers folks. I'll have a look today

Rich

[nomoregt4]

Found a voltmeter like this on Ebay. Will this suffice?

https://www.sourcingmap.com/three-and-half-bits-lcd-digital-multimeter-voltmeter-a830l-p-16365.html?currency=GBP

If The battery was low on power & I've since charged it up, would I still need to replace the Reg/Rec box?

Cheers,

Rich

[Serendipity]

Just to add my experience...

...my '94 CBR6 suffered similar symptoms a few years ago. It would be running fine then suddenly start to run rough and the lights would start to dim. Eventually the bike would cut out and refuse to start.

I replaced the reg/rec and tested the battery to ensure all was fit, but it continued happening. Eventually booked it into a workshop who traced the fault to a melted connector block that was shorting out onto the frame. unfortunately I don't know exactly where the block was in the loom, because I didn't locate it myself and was too stupid to ask at the time.

So as well as the other checks suggested above I'd carefully examine the loom to check that nothing has worn through.


____________________
2016 CBF1000F - Commuter heaven | 1994 CBR600FR - Awaiting defibrillation

[steo]

that multimeter is ok, you don't have to wait to get one posted to you, your local argos do them for a few quid. if the reg/rec is banjoed then you have to replace it regardless of you fully charging the battery. if it's bo**oxed then the bike will be drawing power directly from the battery to run instead of the electrical system & as soon as the battery starts to go flat then the bike will stop running, you could also fry your battery if it's overcharging. do the tests which timmeh suggested in an earlier thread & you should know if you need a reg/rec.

[nomoregt4]

Right, sorry for late update. Instead of buying a voltmeter, I borrowed tonight & the survey said:

With lights off:
12.47 volts @ idle
12.4 volts @ 6k revs

And with the lights on:
12.04 volts @5k revs

So new battery time
If it is a case of needing a new battery, will I still need to replace the Rec/Reg box, or was the bad running due to the battery being shot

I've just seen the price of a new reg/reg on Wemoto, £60 odd quid

Thanks again for all your help.

Rich

[finpos]

That actually looks a bit like the bike isn't charging the battery at all. So, may well be a problem with the reg/rec. You should also check the wiring - pull apart and re-make all the connections.

Does it work fine for a while after you charge it off the bike?

f.

[nomoregt4]

I've not ridden it Finpos since it konked out last. The bike starts fine with the re charged battery hooked up.
Looks like a new reg/rec is needed then

Thanks for all your assistance guys

Rich