feetupfun Posted January 28, 2023 Report Share Posted January 28, 2023 (edited) 8 hours ago, atitagain said: Thanks for the help guys. Next up, I seem to have just a coil and the 3 wires from the engine. I'm not have lights at this stage and when I do I'll go for an Electrex kit. At this stage I just want to assess a running engine. The coil was in a back with a black block connector, which wire goes where? or a photo if anyone has one. The LT ignition wiring from the magneto to the HT coil is usually black coloured. The other wires from the magneto are for lighting and should be insulated from each other and the frame. It doesn't matter how you make the connection for the LT ignition wiring as long as it is secure and electrically insulated from the frame. Bultacos usually have a wiring connector strip near the front downtube but using it is optional. One wire from the kill switch connects to the LT ignition wire. The other kill switch wire connects to the bike earth (frame/motor/stator plate) Edited January 28, 2023 by feetupfun Quote Link to comment Share on other sites More sharing options...
lorenzo Posted January 28, 2023 Report Share Posted January 28, 2023 (edited) "3 wires from the engine" - what are the colours of these ? I'm assuming red, green and yellow. If this is the case, the black? wire from the HT coil should be connected to the red. Green (originally feed to stoplamp switch) needs to be connected to a reliable earth. Yellow you can insulate and ignore - this is the wire from the lighting coil. This applies to the original Femsa wiring.............which may have been altered in the last 50 years. The foregoing is simply to provide a spark and get the engine running. HTH Edited January 28, 2023 by lorenzo Quote Link to comment Share on other sites More sharing options...
atitagain Posted January 28, 2023 Author Report Share Posted January 28, 2023 (edited) Hi, I have black, yellow, green. They look original to me. The green in the photo is not connected to anything. The black and yellow are earthed at the same point? The black from the magneto is connected to the block connector, no spark but I'm guessing one of the wires are wrong. This is a temporary bodge just until I know the correct setup then I'll clean it up but the earth is clean and good. Edited January 28, 2023 by atitagain Quote Link to comment Share on other sites More sharing options...
atitagain Posted January 28, 2023 Author Report Share Posted January 28, 2023 I've re-read the post and earthed the green, now I have a spark. I'll buy a kill switch now. 2 Quote Link to comment Share on other sites More sharing options...
lorenzo Posted January 28, 2023 Report Share Posted January 28, 2023 You have a spark - good, you're getting somewhere. Wires in the pic. appear to me green, yellow, and black with a white tracer - in which case, not original. Yellow is normally connected to lighting coil. Is the lighting coil present ? Quote Link to comment Share on other sites More sharing options...
atitagain Posted January 28, 2023 Author Report Share Posted January 28, 2023 Hi Lorenzo, the wire is just black, it's the light making it seem there is a white tracer. No I don't have the lighting coil. I'm not sure if I will fit lights but if I do I'll use the Elextrex unit Any idea what this is? it came in a bag full of spares Quote Link to comment Share on other sites More sharing options...
sherpa325 Posted January 28, 2023 Report Share Posted January 28, 2023 Sherpas have three or four wires coming from the magneto. Green goes to earth, Black goes to the coil and kill switch, yellow is lights so just terminate that at your junction box. Some later ones have a red wire also which is also stopped at the junction box. 2 Quote Link to comment Share on other sites More sharing options...
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