Suzuki GT125 wiring?

[NickMcDonald]

Howdy all. Im hoping one of you wiring experts will be able to help me out here, since anything to do with electricty may aswell be black magic to me.....sigh. Im looking at wiring up my suzuki gt125 bucket racer. I wont be needing any of the lights, tacho etc....I just want it running. So, i have a black cable running out of the engine next to the chain. In it are a yellow wire with a green trace, a green, a blue, a tan, a black, a green with tan trace and a red with green trace wire. Also, there is a black wire running next to it seperate to the aformentioned bunch of wires.

Im imagining I'd only need very few of these wires. Being a twin cylinder, I have 2 ignition coils. One has a black wire hanging out of it, and the other a yellow wire.

If anyone can make some sense of this, or has a decent idea of what is supposed to go where, a point in the right direction would be much appreciated!

Cheers, Nick.

[spanner spinner]

yes you only need two wires from the bottom, i can't find a wiring diagram on the net so you will have to trace some wiring. There are two sets of points under the right hand engine cover you need to find out what wires are connected to these as these need to go to one side of the coils. Do you still have the full loom as this sould make it easy to trace the wire colour back to the wires coming out of the engine. the other side of the coils need to be connected to a battery + to the coils connect the - to the engine cases.

[Akzle]

yes you only need two wires from the bottom, i can't find a wiring diagram on the net so you will have to trace some wiring. There are two sets of points under the right hand engine cover you need to find out what wires are connected to these as these need to go to one side of the coils. Do you still have the full loom as this sould make it easy to trace the wire colour back to the wires coming out of the engine. the other side of the coils need to be connected to a battery + to the coils connect the - to the engine cases.
+1.

"out of the engine next to the chain" - a bit more descriptive might be good. this is seperate from your magneto assembly?
has it been modded to total loss?
there's not much 'lectric inside a combustion engine...

i'm guessing the seperate black one (infact, any solid black ones) are your ground potential.

wiring generally:
magneto goes to charging circuit & timing (CDI)
CDI needs power in (from batt), puts out signal to ign coils.
coils are grounded, when signal from cdi, sends spark.

wires from "engine" may include oil pressure/temp sensors, GPI...


((edit))... of course if they're not actually "coming out of the engine" and that's just where the loom is secured/passes through (unlikely, but not looking at your bike i can't say) they could all be BS - tail lights, ie.

[NickMcDonald]

Thanks for the replys,

Its still confusing and I think I may be missing a CDI...
Heres some photos of everything that came with the motor...

265740
265741
265742
265743
265744
265745

[NickMcDonald]

265748
265749


We have two sets of points, and two condensers. The left hand condenser has one wire running to the points on the left, and one white wire running up through the wiring loom. The condenser on the right has one wire leading to the right hand points, and a black wire running up through the loom. I'd imagine that these two wires are the feeds to the coils? Or am I missing a CDI that these wires would go to?

[ducatilover]

I imagine it doesn't run a CDI if it has points?

[spanner spinner]

no cdi if you have points, as per my other reply wire one coil to one set of points the other coil to the other set of points. Connect the battery to other terminal of the coil earth the battery to the engine cases. You will need to trace your wiring back to work out what coil to connect to what set of points.

[davebullet]

PM sent about the wiring.

Out of interest - what tyres are you running on yours? Still got the standard 18" 2.75 and 3.00 rims? (my wheels are the alloy version - circa 1979)