SOHC.co.uk Forums > CB500/550
Ignition coils
Sesman:
Thanks Ash. To be honest I’m absolutely no sparky in any sense. I just presumed that doing a continuity test (not an ohmic measurement) would give me an initial indication of general functionality. I’ve used a martindale across the secondary and get no response. Could the relative internal impedance of coil versus instrument be the problem?
Is there a better way to test? Not sure why I need a condenser in circuit to generate a spark as I’m simply flashing the primary across 12v…I’m totally flummoxed.
Sesman:
I’ll Jerry rig the coils in situ and crank the engine….fingers crossed?
heli_madken:
Happened to me in 1979 on a GL1000, engine cut dead. For the life of me to this day I cant imagine how it could happen to both coils at the same time. Dad towed me home which of course would never be allowed now. Local Honda dealer only had CB400 coils in stock and as I needed the bike for work I had to jury rig the and make do, went on that way for the next two years before I bought new coils.
AshimotoK0:
"Without the capacitor, the points will be rapidly eroded and the collapsing magnetic field will expend a good part of its energy as a few dozen volts maintaining the unwanted arc across the points".
Trust me .. without a capacitor you will get s very weak spark or not at all from the secondary of the coil
Sesman:
I trust you fully Ash. I totally get the stored energy concept to minimise sparking across the points. Could it be that the volt drop across the 15kohm secondary is so high that it can’t drive the buzzer in the continuity testing device?
Would you know what type of meter is being used in the workshop extract attached?
I’ll connect the coils up and test in situ by cranking the motor after testing the primaries and points circuit in situ, that should eliminate all but the secondary coils. If I do need replacements, can you recommend a product?
Thanks for your help with this.
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