Electrical Problems on NSR125R! ***FIXED***

[c058y]

After striping down the bodywork and doing a major clean of the whole bike I began putting it back together again. Before I got started I thought I'd just check the thing still works.

You will never guess what? It doesn't!!!

I'm pretty sure there is something wrong with electrics. The battery is fully charged, I'm sure of that. I have checked most of the connections, mainly the ones under the fuel tank and airbox, unfortunately no response.

Picture this, I turn on the ignition and nothing happens! No lights, no nothing! Not even the little black box (exhast valve?)to the right of the carburetor doesn't turn round!

Any ideas? Main areas to check? Fuses?

Please help!!!!

Thank You in advance!

c058y

[tatters]

check your main fuse, located in the wire running from the positive of the battery.


if the thin wire in side that glass tube of the fuse is broken the fuse has "blown" so replace with a new one all car shops/homebase etc sell them just state the rating (amps)
____________________
Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV

[alains]

1) check the fuse (normally it's a 15A) if you have nothing to do it , pick a bit of cuper wire , turn your key on , they shunt the 2 ends and move a bit . if you see sparks , change the fuse . note that for 10 years , i never had a fuse gone .
2) check the poles of the battry , probably a loose contact . clean the poles with sand paper . then refit the connections
3) it's very rare but it happens you made a short circuit , test your battry again . 12.8 to 13.2 is sign of good charge
4) let me know
____________________
the worst day fishing is better than the best day working

[tatters]

just to note, don,t short the fuse carrier out with cable, the fuse is there to protect the bikes circults and by shorting out could cause the wiring loom to fry,

and when you remove the battrey ALWAYS REMOVE THE NEGTIVE first on jap bikes before the postive, because the frame is negtive and you don,t want the postive to make contact with the frame (other way round for classic british bikes which postive is the frame)
____________________
Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV

[c058y]

[tatters]

could be the CDI, l,ve had it before on a NSR125R, not sure how to check it l just changed mine over and it worked,



wd40 on connections, and checking supply to the ingestion with a multi meter is all l can suggest
____________________
Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV

[alains]

if not light goes on when you put contact , this is the battry or battry connection . check the negative , refit it after cleaning . then take the + off , turn your key on , then put the + wire in contact with the + battry , if you do not see sparks , it's either flat battry or main negative connection off . let me know
____________________
the worst day fishing is better than the best day working

[c058y]

The CDI, thats the unit just under the grab rail right?

If thats the case I have just had one delivered today after buying it off ebay. All connected, no difference.

I have looked at the technical diagrams on www.nsr125.com, playing close attention to the wiring loom, and no joy there.

Any other ideas?

[tatters]

you would got a spark and the fuse would of blown if the postive made contact with the frame, so unlikey,
____________________
Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV

[alains]

rubbish ! if you take care of what you are doing , no problem , my job is electrician & electro-mecanician , trust me , do what i said !
____________________
the worst day fishing is better than the best day working

[tatters]

its is a basic safety precaution to remove the positive first to prevent damage to the electrical system, and especaily on a motorcycle which is a Zone 1 area with petrol involed.


by the way l,m a Zone 0 quailtyed electrical engineer and have worked in numerous explosive enviroments
____________________
Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV

[c058y]

[Jammy-G]

You've checked everything is earthed correctly?
____________________
RooRoo: just like the time i stuck my finger up my arse with no lube at all and she didnt talk to me for hours

[c058y]

This may sound silly, but how do i check if has been earthed correctly? Where do i check?

[alains]

i've never seen a charger showing a fully charged battry . you must now borrow a voltmeter somewhere & check the voltage . a battry is composed with 6 elements which are 2.2 V when fully charged and 1.8 when low so the Voltage is 13.2 high and 10.8 low . after some use a 12.8 v fully charge is good enough . Do not worry when you charge it is the Voltmeter shows little flood inside the battry , it will go up after 1H or to . anyway do not try to charge quickly (not more than 2A ) you will destroy it .
to check if your battry has some power , take a piece (1 foot) of insulated cuper wire , take off a bit of insulating at each end , then stay in contact with the + at one end and with the other end scrap on the negative , if no sparks your battry is dead or discharged
let me know about the results
____________________
the worst day fishing is better than the best day working

[Jammy-G]

On my bike, I'm not sure about others, it earths through the frame.

My bike has a negative earth, so the negative wire from the battery connects to the frame.

Check where the negative wire from the battery goes, or if you can't see, run a new dummy wire from the negative electrode on the battery to a main part of the frame. (Metal part )
____________________
RooRoo: just like the time i stuck my finger up my arse with no lube at all and she didnt talk to me for hours

[c058y]

[swampy]

I had exactly the same trouble on my nsr, it turns out that there was a corroded connection in the loom where two live wires join into a single live wire. (i found this by wiggling the loom more in hope than expectation, and suddenly the lights came on, and went off when i wiggled a particular bit.) I opened the tape on the loom, chopped out the bad bits, and soldered in a new piece of wire, and it seems to be ok now touch wood.... hope this helps

[stinkwheel]

You don't have the kill switch on do you ????

Whilst we are on dumbass things. You have the plastics off right? This would include the entire front fairing which includes the headlight and flashers along with a variety of other bits of wiring that would normally be connected to the bike??

The japanese are buggers for earthing vital circuits through stupid places (like brakelights and horns). Also in removing the plastics, you sure you haven't dislodged something behind the clocks/dash? It is most likley going to be in the part of the circuit taking power to the ignition switch from the battery to make EVERYTHING fail.

Another place to check is the starter solenoid (follow the big fat wire from the battery positive, it will attach to the top of the solenoid). Many bikes run all the power to the rest of the bike through this area and the terminals do corrode, some (not sure about your bike) also have a fuse on them.

Look round the headstock and under the tank for signs of the loom rubbing through ant trapped wires under any bits you have put back on.

You may land up with everyones favourite....pulling the connectors apart one at a time, cleaning them with emery paper and reassembling with a smear of copper grease...takes a long time!

Whatever you do, if you pull something apart, put it back together before taking some other bit apart and forgetting where everything goes. Otherwise if you take it to a sparky at a later date, they will kick your arse for you.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[c058y]

Thanks for all your help guys!

I still haven't managed to fix the problem. The only thing left to check would be a loose connection within the loom. Unfortunately not enough hours in the day

Well it looks like my mechanic is gonna have a search on his hands!

By the way I didnt have the kill switch on!

Once again I thank you for all your help!

I'll put up a post after my mechanic has figured out whats wrong. It better not be something really stupid.

Cheers all

c058y

[Honda_nutter]

Hi.
I just the exact problem with my NSR125. Luckily my dad is an engineer so he sorted the problem rather quick. Wot it turned out to be was the wire between the battery and the ignition switch as when they manufacture the bike they put a cable tie so hard on the connection to the ignition swith, Try is it out.
Put a voltmeter over it with the negative on the battery and the positive on the ignition switch.
If it is sumthin like 12v when the ignition is off but when you put the ignition on, though the lights dont go on, it drops in voltage then this is your problem.
let me know
regards
____________________
Matt

[c058y]

Well I have my bike back now, running like a dream!

It turned out to be corroded wires within the loom. My mechanic had a major search om his hands. There were three wires disconnected. Although it did take him a while to locate them.

I never would have found the problem myself but it has taken a chunk out of my bank balance now.

Thanks for all your help guys.

c058y