SOHC.co.uk Forums > CB500/550
Electronic ignition
deltarider:
--- Quote ---The spec sheet shows a lowest primary resistance of >5 ohms
--- End quote ---
Strange, are you sure?
masonmart:
--- Quote from: deltarider on June 08, 2016, 10:12:52 PM ---
--- Quote ---The spec sheet shows a lowest primary resistance of >5 ohms
--- End quote ---
Strange, are you sure?
--- End quote ---
Just from the manual that I have but I'll check. I measured my coils today and the primary resistance is <5 ohms. I'll buy the Micro Digital coils just in case. £100 is worth it insurance wise.
deltarider:
Why the hurry. I'd rather expect B&B ment < 5 Ω because for example OEM Honda coils measure 4,7 Ω.
gtmdriver:
This is a copy of the original instructions.
and this is the reply I got after enquiring about suitability for the 350/4
"Hi. Could you tell me whether the KIT00089 designed for the Honda 400/4 will also fit the very similar CB350F 350/4 which was its contemporary everywhere but the UK?
Hi, If it fires the same (has the same degrees for firing) and is also a single cam, then yes it should be fine. Regards Stuart
As standard it has two contact breakers set 180o apart with a single cam running at crankshaft speed. It uses the wasted spark system to fire two cylinders together.
I guess the only unknown is whether the ignition advance curve built into your system will also suit the 350.
I have found these figures in a genuine Honda service manual.
Honda CB350F centrifugal ignition advance
Start of ignition advance 1400 – 1600 rpm
Full advance reached 2300 – 2500 rpm
Advance angle 23.5o – 26.5o
Are these anything like the advance curve built into the KIT00089 electronic replacement?
Hi John, It sounds like it should be ok. The total advance should cover the 350.The system will run standard 4 ohm dual coils and will need 5k ohms plug caps, should already be on the machine.
t looks like the start of advance is ok, and the system will cover the fully advance figure. Our system reaches fully advance at around 3,500 rpm."
When I found that the DSS replacement coils were only 2 ohm I phoned BB and they told me I would need to run with ballast resistors.
...and this is how I fitted them.
This is the wiring diagram without ballast resistors.
cb550k-aaron:
I Have one of the Boyer Bransden Mk3 kit but when it's all linked up it's only drawing 1v :( anyone any ideas?
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