Posted September 17, 201014 yr Howdy, So today I've started to think about making my custom loom up, only to discover that my coils only have one wire going into them.... Normally there is two. What does this mean? Are they completely unusable or is there a way around this?
September 17, 201014 yr Moderator Howdy, So today I've started to think about making my custom loom up, only to discover that my coils only have one wire going into them.... Normally there is two. What does this mean? Are they completely unusable or is there a way around this? should be 2 wires, pikkies please?
September 17, 201014 yr Normally if theres only one wire going into somthing it means it needs a negetive ground to the frame. That is only a guess as i dont know the bike. So i`m prob worng.lol
September 18, 201014 yr Author It was ones of these http://cgi.ebay.co.uk/YAMAHA-XS400-XS-400-1978-1985-IGNITION-COIL-210-/180412282181?pt=UK_Motorcycle_Parts&hash=item2a0168f545
September 18, 201014 yr It was ones of these http://cgi.ebay.co.uk/YAMAHA-XS400-XS-400-1978-1985-IGNITION-COIL-210-/180412282181?pt=UK_Motorcycle_Parts&hash=item2a0168f545 yeah that will be grounded to the bike . So if your bike has the black cable from the battery connected directly to the frame you should be ok . If not you will need to run a negetive to the chassi part of the coil . IMPORTANT EDIT : IF YOU TAKE THE SECOND OPTION I WOULD ADVISE THAT YOU SHIELD THE COIL FROM THE FRAME WITH RUBBER OR THE LIKE OR YOUWILL INADVERTENTLY ADD A NEGETIVE GROUND TO THE BIKE REMEMBER TO DO BOTH BOLT HEADS ALSO FOR THE SAME REASON. YOU DONT WANT ANY PART OF THE COIL TOUCHING THE BIKE INCLUDING BOLT TO COIL TO BIKE ....IF YOU GET ME My rxs has a neg ground so EVERYTHING only has one wire ...lights , coils ,everything . This can lead to ground failure and it can be a pain to find if somthing corodes etc . so if you are designing a newsystem for it it may be beneficial to you to put in a negetive rail . sorry fgor all the edits ...haha ... : if you redesign a bike from neg ground to a "railed negetive" you will need to isolate everything from the bike . I dont even know if that is possible so definatley ask somone with more knowledge than me !!
September 18, 201014 yr Author A coils ground is the spark plug though isnt it? My old coils has two wires in, one for the condensor and one for the points.
September 18, 201014 yr A coils ground is the spark plug though isnt it? My old coils has two wires in, one for the condensor and one for the points. yeah you`re probably right . See i told you i would be completely wrong ..lol . looking at the coil though . Its a metal chassi and if its a neg ground it will be grounded by the frame . Thats where my assumption came from . it might be an idea to get the coils with 2 wires to make sure you`re ok
September 18, 201014 yr Author It's ok, at least your offering advice! I just cant think of a logical way around using a coil with only one hook-up without using more relays (which I certainly wont be)
September 18, 201014 yr It's ok, at least your offering advice! I just cant think of a logical way around using a coil with only one hook-up without using more relays (which I certainly wont be) i would try and source some better coils in that case .
September 18, 201014 yr Moderator It was ones of these http://cgi.ebay.co.uk/YAMAHA-XS400-XS-400-1978-1985-IGNITION-COIL-210-/180412282181?pt=UK_Motorcycle_Parts&hash=item2a0168f545 when I was buying new coils I came across those. Figured that there was no satisfactory way to use them as you need a + supply for the coil and an interupted earth for the points. the only way to use them would be to isolate the coil form the frame and run a negative to the points, not the best. check the ohms rating as they could also be for electronic ignition systems!
September 18, 201014 yr when I was buying new coils I came across those. Figured that there was no satisfactory way to use them as you need a + supply for the coil and an interupted earth for the points. the only way to use them would be to isolate the coil form the frame and run a negative to the points, not the best. check the ohms rating as they could also be for electronic ignition systems! Thats kinda what i thought . Mine is electronic which would suggest thats why mine has only one wire also . (mine is poxy 6v too ....yamaha definatley mucked that one up !!)
September 18, 201014 yr Moderator Thats kinda what i thought . Mine is electronic which would suggest thats why mine has only one wire also . (mine is poxy 6v too ....yamaha definatley mucked that one up !!) They are pretty much the same as the DT coil, the points should interupt the live feed to the coil by discharging it to earth. Or on a cdi switching it off electronically. Black wire for primary coil earthing to the frame and big wire the secondary high tension earth'd via the spark plug. I take it you need two of them then?
September 18, 201014 yr Author Thanks for your inputs everybody, I guess I need to find some new SUITABLE coils.... Does anyone know which ones I could use? Without going to wemoto and spending £30 per coil. Thanks, Joel
September 18, 201014 yr Moderator on the XS there is a continuous live feed via the ignition switch. the contacts earth the coil to charge up the primary, when the earth breaks, the secondary coil discharges that energy to ground (the spark plug) this is in very simplistic terms. with one wire, all i can think is the live is triggered!
September 18, 201014 yr Author on the XS there is a continuous live feed via the ignition switch. the contacts earth the coil to charge up the primary, when the earth breaks, the secondary coil discharges that energy to ground (the spark plug) this is in very simplistic terms. with one wire, all i can think is the live is triggered! This sound like what I was thinking, by putting a separate relay in that is deactivated by the points (way to much hassle)
September 18, 201014 yr Author Ok problem solved! I bought some different coils! I guess I will have to sell these other ones!
September 18, 201014 yr Author On the xs650 coils, from the coils, where do the red and brown wires go?
September 18, 201014 yr Moderator This sound like what I was thinking, by putting a separate relay in that is deactivated by the points (way to much hassle) No way it would be fast enough or able to last more than a few minutes tops before the relay failed.
September 18, 201014 yr Moderator On the xs650 coils, from the coils, where do the red and brown wires go? as it happens i have an xs650 wiring diagram
September 18, 201014 yr Author Aha, now that looks more like what I'm working with! I will copy this exactly! Although there is no condenser any more =( Shall I just leave it out?
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