Wiring Loom,cb125 1984 with cg125 engine

Leighroy wrote:

Hi , it's a 12v

The bike or the engine?......

The UK/Europe catalogue 'CB'125, in 1984 was a mono-shock twin; the CB125TD-C, which your bike isn't, or the twin-shock single CB125RS, which your bike also isn't from what I can see in the pictures; looks ore like the older, 1975 ish CB125S or CB125J...

It would probably be helpful to know exactly what the 'base' of your mongrel is....

However, CB125S/J/RS all used the Over-Head-Cam single engine; and had 6v generators and kick-start only. Earlier S &J had points ignition, later RS had CDI ignition.

So, fair guess that the original loom on your bike was 6v, and likely for a points ignition engine.

CG125.. early models were 6v electrics with pots ignition, I believe, later models 6v electrics and CDI ignition, later still they got 12v and CDI then they acquired an electric starter along side thier kicker, then they lost the kicker... while variations and permutations on the plot started getting built n China and other places....

WHICH leaves a HUGE number of permutations and possibilities, hinging on what you ACTUALLY have to start with..

What is the actual model of bike... then what's the source of the alleged CG engine... and if t IS an actual Honda made CG engine, which one? AND THEN.. how has the whole confection been muggered about with and what's been 'adapted' to make that motor work, in any way, in that frame, with parts that might belong to neither the base 'bike' or the 'base' engine, but be sourced from yet more small hondas of era, or from after-market catalogues, as 'unversal-spares', cobbled together from odd-packs from Halfords, or taken from a chinese CG 'clone' in a breakers?

THIS is the problem with any home-brew 'special'.. but i this case, you have such vague description of what the basic 'ingredients' are...

THEN to say that the loom fitted is 'incorrect'.. well, yes it would be... they didn't make a loom for a CB125 with a CG125 engine, so it is going to HAVE to be adapted some-how to suit....

To say it 'doesn't work'.. yeah.. its a PRETTY complicated sub-assembly... WHAT doesn't work? The engine doesn't run? Brake light doesn't light up off the front brake lever? WHAT!?!?!?

You aren't exactly giving us much to help us help you here!

As to the question, where could you get a loom that worked.. you probably CANT.. like I said, its NOT a standard motorbike, its a 'Custom' it will take some sort of 'custom' loom to make all the electrical equipment work, and that means that you will probably have to make it, yourself, OR at least 'adapt' bits of a loom for the stuff on the bike, with bits of loom for the bits on the engine, and you are likely to have to swap components, like switches and bulbs and horns and stuff, from what is fittted to the bike, to do what that part does on the bike the engine came from.

Eg: Your bike most likely had pots ignition; engine likely has CDI ignition; bkes wiring loom, then wont have the wires to trigger the CDI or to turn the ignition off. You will need the CDI that matches the engine, and to find a place n the fame for that to live, and then to sort the wires that give that power from the generator; you are likely then to find that you have a 6v coil, and the CDI blows up, cos ts delvering a 12v supply to it... so you need another CDI and a new 12v coil.. then you'll getthe engine runnng, and find that the ignition switch doesn't turn it off, cos it doesn't have the terminal that has a wire going to the CDi to tell it to do that; you are likely to have a headlamp switch that is 'wired' for AC direct lighting, taking power straight off the generator, not the battery, and back-feeding in the 'off' position, that current to a simple zenner diode, rather than a regulator.... SO to get the lights to 'work' you'd have to adapt the switch to not back-feed i the off-possition, and take power off an 'ignition switched live' feed.. wich the original bikes ignition switch might not have.. AND then find a home for a propper regulator, in place of the zenner diode, and sot the wiring from the generator to put charge to that regulator.. AND.... as bike was probably originally 6v... uppig the supply voltage to 12v will have halved the current drawn through switches, 6v batteries, horns, bulbs and indicator relays wont take kindly to being hit by twice the volts, and so all these may need to be swapped...

BUT, that IS stabbing i the dark, because we DON'T know what you got, and nor do we now what isn't working, really....

Help us help you.... OR go get a multi-meter, and the Haynes manual with the wiring diagram for the bike the engine came out of, and try and re-make THAT, 'some-how' on the bike you have... which is probably the ultimate conclusion of the matter.... 'Cos as this isn't a bike any-one made 'as standard' there wont be a 'standard', off the shelf part you can buy to fix all your ills.
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