GP125 electrical questions...
Posted: Sun Jun 14, 2020 6:35 pm
G'day all,
Hoping I can get a bit of help with my 1980 GP125 project.
I got the bike in a pretty basic state... a rebuilt motor which runs nicely, but no wiring loom or lights, etc. So I got a wiring loom from a 185cc Suzuki ag. bike, which seemed close enough to what my perusal of a GP125 wiring diagram showed. I also bought a Stanley rectifier unit (those simple little things with one wire in and one wire out).
Now it's all hooked up and running, the lights are working (except the indicators... waiting for those to arrive via eBay sometime in the next 6 years).
I'm a real newbie when it comes to magneto systems; I'm far more familiar with the 3-phase alternators of the GS/GSX Suzukis, but my knowledge there is of little relevance to the 6 volt electrical magneto system of my GP125. Soooo... my questions are:
1. Is it normal for the lights to be really dim at idle (tail light is almost flickering at the specified 1300 rpm) and really bright at a few thousand RPM. Like, so bright that the tail light almost could pass for the brake light?
2. There doesn't appear to be any voltage-regulating function in these electrical systems. Is this true? Or is there meant to be some sort of self-regulation of the voltage by some gizzardry in the magneto unit?
3. One thing the PO did supply with the machine was a regulator-rectifier unit he'd obtained from a wrecker/ breaker. I assume it's for a 6 volt system, but I have no way of really knowing. It has 4 wires: green, black, red, pink. Assuming it's compatible with the GP125 electrics, how could this be wired in to the existing system?
Thanks chaps and chapettes for any help you can offer.
Cheers, Mike.
Hoping I can get a bit of help with my 1980 GP125 project.
I got the bike in a pretty basic state... a rebuilt motor which runs nicely, but no wiring loom or lights, etc. So I got a wiring loom from a 185cc Suzuki ag. bike, which seemed close enough to what my perusal of a GP125 wiring diagram showed. I also bought a Stanley rectifier unit (those simple little things with one wire in and one wire out).
Now it's all hooked up and running, the lights are working (except the indicators... waiting for those to arrive via eBay sometime in the next 6 years).
I'm a real newbie when it comes to magneto systems; I'm far more familiar with the 3-phase alternators of the GS/GSX Suzukis, but my knowledge there is of little relevance to the 6 volt electrical magneto system of my GP125. Soooo... my questions are:
1. Is it normal for the lights to be really dim at idle (tail light is almost flickering at the specified 1300 rpm) and really bright at a few thousand RPM. Like, so bright that the tail light almost could pass for the brake light?
2. There doesn't appear to be any voltage-regulating function in these electrical systems. Is this true? Or is there meant to be some sort of self-regulation of the voltage by some gizzardry in the magneto unit?
3. One thing the PO did supply with the machine was a regulator-rectifier unit he'd obtained from a wrecker/ breaker. I assume it's for a 6 volt system, but I have no way of really knowing. It has 4 wires: green, black, red, pink. Assuming it's compatible with the GP125 electrics, how could this be wired in to the existing system?
Thanks chaps and chapettes for any help you can offer.
Cheers, Mike.