CG125 - Starting without a key?!

[mudcow007]

hello all

im working on a CG125 (1984-5 Brazillian) which is also my first bike

i have the V5 etc so i know the bike isnt dodgy etc but...it starts without a key in the ignition an the only way to stop it, is to pull the black & white wire from by the genny

the loom looks like it is untouched - with no sign of masking tape etc

when i bought the bike the barrel was unconnected. i have replaced this anyways at the one on the bike was rusty

none of the wiring is connected up at the moment as it didnt have a headlight an the wires were just wrapped up an disconnected from the loom

anyone any ideas how the bike starts with the ignition not connected?

the only thing i can think of is that the barrel has been bi-passed some how??

cheers!

[Usher4566]

Hi mate I don't no how but I've always none this from a kid works on most old bike just diconect ignistion in head light bike starts but you shouldn't have lights if I rember right or indicaters Ect .handy to no if you lose key lol
____________________
New cd200 benly owner

[mudcow007]

blimey!

so im guessing alot of the older bikes were stolen this way aswell then...

cheers for that i was getting a bit freaked out - an i didnt want to start cutting into the existing loom to check wires

[open]

Disconnect the b & w wire from inside the headlight going to the barrel
____________________
"Calamity - A more than commonly plain & unmistakable reminder that the affairs of this life are not of our own ordering."

[s]Baotian BT49qt-9 --> Honda CG125 (4 speed) '51 plate ----- 03/11/2012 Mod 2 PASSED! --> Cb500s[/s] Revoked

[mudcow007]

[Usher4566]

[Piercee100]

I had this on my H100 whe I replaced the ignition barrel, didnt make sense to me at the time lol. Basicly if the wires are disconnected then its good to go! You actually connect the wires to stop it lol
____________________
Rides: Honda H100a (Retired), VT500e (Sold), Kawasaki ZX400 (sold), Kawasaki GT550 (Sold), Suzuki Inazuma (Daily), Honda CD185t (Broken), LML Star 2t (Last run edition).

[Teflon-Mike]

1/ The small hondas & a lot of older bikes turn the engine 'off' by 'making' a circuit to 'short-circuit' the low tension feed to the ignition coil.

Ie; turning the ignition witch 'off' actually turns 'on' a circuit to by-pass the coil.

2/ If you have bought a generic replacement ignition switch, then the black/white wire that connects to the coil to short it out & turn the engine off, is often NOT in the connector block, but hanging seperately on a bullet connector.

Later bikes & other variants, have other switches to kill the ignition; side-stand inhibit, for example, or a seperate emergency 'kill' on the Twist-grip side switches.

Plugging generic ignition barrel into loom with connectored ignition wire, wire ends in connector block, and turning key wont make circuit to turn engine off.

You'll need to snip the wire a short way from the connector & fit a bullet terminal to plug into the 'loose' lead.
____________________
My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?'

[mudcow007]

[caferacer]

Old thread I know but I think it could do with a tiny bit more info to be of any help to those looking at it in the future.

That wiring diagram is fairly universal in terms of the ignition switch in older hondas.

In the diagram the ignition is the top left switch box with four wires coming out of the base of it labelled HO E BAT IG.

When the switch is in the ON position, a circuit is made between BAT and HO.

When the switch is in the OFF position, a circuit is made between E and IG - bypassing the ignition coil.

So when the switch is ON a connection is made between the battery (BAT) + and the lights (HO).

When the switch is OFF a connection is then made which bypasses the ignition coil circuit by making a circuit from the alternator (IG) to the lights etc again - but not from the battery to the lights so it wont drain it. This stops the bike by giving the current an easier route than going to the ignition coil and therefore the spark plug has no power.

So by removing the ignition switch all together, the connection which bypasses the ignition coil is off but the connection between the battery and the lights is also off.

Excuse the idiot language - I know this is far from a technical description but I have tried to explain it in a way the more practically minded can understand it without much knowledge of electrics (like me). Please correct if I'm wrong on any points.

[lozza59]

I HAVE A SIMILAIR PROBLEM
MY ENGINE IS RUNNING WITHOUT THE BIKE!