SOHC.co.uk Forums > CB500/550
Ignition dilemma
Lobo:
Hi Norniron,
Agreed... if you're going to fit higher spec coils you probably do need to 'offload' the poor old Kill Switch a bit.
A couple of comments, having slept a bit.
(1) some electronic ignitions (eg DSS offering) will use a 'full time' live supply (eg rear brake light black lead); and in this case will not be drawing any extra current through the kill switch. In other words, such systems do not really need extra relays.
(2) other electronic systems, such as my Newtronic, specifically state that their unit must NOT be permanently live, as damage would result.... much as leaving the coils ON when the bike's not running. Newtronic thus specify their unit is to be powered through the kill switch... I guess whether you then add in a relay to offload the kill switch is up to you. (I have)
(3) If you're going to be replacing the coils with non-OEM high Perf units.... a relay is almost certainly advised.
(4) Electronic ignitions have a minimum voltage requirement, and below this 'will not play ball'. I can't remember, but it is normally specified, and around 9v as I recall. A relay suffers the same problem, ie requires a minimum voltage to operate, so don't go choosing one with an 11v threshold! (I think they're all arounds 9v to be honest).
Point is though, if the battery is seriously depleted you're not going anywhere.... even bump starting will not help. On a poorly bike, using the starter motor may drop the voltage below critical too..
(5) in my diagram connections 86/85 can be reversed, and connections 30/87 can be reversed... it doesn't matter.
I've included a typical relay link.... tho' they're avail all over, Maplins, Halfords etc... if wanting to get technical (yawn) you're after a 12vDC / 5A (minimum) SP/ST/NO. (single pole, single throw, normally open). It'll have 4 connections...
Hope this helps,
Simon
http://www.autoelectricsupplies.co.uk/product/169/category/36
matthewmosse:
I don't think my boyer system ( stock coils but replaces points ) reccomended a relay. One thing I would say about relay useage. My Bmw twins were both fully loaded with relays to protect the switchgear, especially the ex police bmw. At 90,000 miles for the ex plod bike and about 75,000 for the other the switchgear was in pretty poor shape. No end of electrical issues. Swichgear itself on the bmw machines was by tec, same as my 500/4 I belive? Anyhow the point I am comming to is that my 500/4 completed double the milage of either of the bmw machines and all the switchgear has remained reliable, totally reliable. The bmw stuff had the benefits of relay protection and yet both the relays and switchgear were the cause of may hours fault finding and a couple of Aa recoveries when things like the headlights decided to play the no worky game when out on long ride outs. This inevitability means I think if you can get away with it, then avoid unnecessary complication. In short I think I would start by checking no relays are required with any electronic ignition. On my cb500/4 I have 2 ignition circuits, one being remotely controlled by the keyfob. Not only does this mean you can start the bike from the comfort of your own home and come out to a ready warmed engine, but before now I have blown the bikes main fuse, and not had to stop or pull over, I was able to pull in the clutch, and restart using the remote. Also handy for scaring the living daylights out of passers by, when the bike apparently starts itself as they walk past.
Norniron:
Thanks simon for your time trouble and knowledge.
Very much obliged
David
Trigger:
--- Quote from: Norniron on January 15, 2015, 08:52:27 PM ---Thanks simon for your time trouble and knowledge.
Very much obliged
David
--- End quote ---
Are you learning about electrics mate ;)
Norniron:
--- Quote from: Trigger on January 15, 2015, 09:04:30 PM ---
--- Quote from: Norniron on January 15, 2015, 08:52:27 PM ---Thanks simon for your time trouble and knowledge.
Very much obliged
David
--- End quote ---
Are you learning about electrics mate ;)
--- End quote ---
Trying to trig
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