SOHC.co.uk Forums > CB500/550
Electronic ignition
Sesman:
Just kidding ;D..
AshimotoK0:
I found this which answers my question on the Boyer Bransden system. It only has a single transistor because it fires all 4 coils at the same time. .. so I guess consumes double the current of the standard ignition
http://www.sohc.co.uk/index.php?topic=9062.0
Also found this where a Norton guy de-potted a BB unit. :-
http://atlanticgreen.com/boyerexposed.htm
The Honda 4-Cyl Mk3 one which one I am de-potting has blocking diodes on each coil though and a string of 5 series connected Zener diodes, which protect the transistor. Still plotting out the Honda-4 version circuit. All of the capacitors are tantalum type.... which is good news.
Oddjob:
Ash, reading that Norton BB post made my head hurt. Shame on you picking on an old man.
My Hondaman ignition module arrived today ;D ;D. Only fault is there are no holes in the circuit box to attach it to anywhere, I'll have to make a cage for it to hang it off the back of the battery box.
Johnwebley:
--- Quote from: AshimotoK0 on January 27, 2022, 12:43:27 AM ---I found this which answers my question on the Boyer Bransden system. It only has a single transistor because it fires all 4 coils at the same time. .. so I guess consumes double the current of the standard ignition
http://www.sohc.co.uk/index.php?topic=9062.0
Also found this where a Norton guy de-potted a BB unit. :-
http://atlanticgreen.com/boyerexposed.htm
The Honda 4-Cyl Mk3 one which one I am de-potting has blocking diodes on each coil though and a string of 5 series connected Zener diodes, which protect the transistor. Still plotting out the Honda-4 version circuit. All of the capacitors are tantalum type.... which is good news.
--- End quote ---
Brilliant,
Sent from my SM-A750FN using Tapatalk
Green1:
Been having trouble with my 550 for ages now not firing on all four. 1&4 refuse to fire. Tried swapping the blue and yellow wire and no change.
I have replaced coils,leads, caps and plugs. They all test fine.
Put a new battery in awhile ago. In the wrong way round. ::) Resulting in me striping the main loom to look for damage. No major damage other than a couple dodgy old repairs and a few corroded cables now cut out and replaced and burnt harness behind the fusebox now replaced. Must have made a difference as the lights are clearly a lot brighter and 2&3 have a bright blue spark. I've tested the Boyer Branden and confirmed over the phone with them it must have been damaged when connecting the battery the wrong way. New BB and still no spark on 1&4.
The only thing I can think of now is the stator must have been damaged as that's the only other thing I can think of that would control the spark.
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