SOHC.co.uk Forums > CB350/400

Coil - plug cap - sparkplug combo

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Erwin83:
Hi. Looking for a refreshment of my memory.
I solved a spark issue with my CB400f a couple of years ago by making the right combo of caps and plugs. I'd like to not make this mistake again, but I lost the 'rule'.

Current situation on the project CB350f:
Planning to use normal ignition (interuptor) system, no electronics.
I have the standard coils (4kOhm?) and a set of ngk spark plug caps that all have a measured resistance of around 1kOhm (which I pulled off a CB400f a couple years ago).
Am I right to conclude that in this case I will need to choose the spark plugs with resistance? So the BP8RS and not the D8EA?

Orcade-Ian:
Wrong way round Erwin,
If you have resistor caps then you need NON RESISTOR spark plugs, I always used NGK’s but there are a lot of crap copies about so moved on to Denso.

Regards,
Ian

Erwin83:
Hi Ian

Ok, but... do the 1kOhm caps count as resistor caps in your experience?
I thought the prescribed resistor caps are 5kOhm, hence my preliminary conclusion these 1k version need more Ohms elsewhere...

Orcade-Ian:
Sorry Erwin,
I wasn’t aware that there were two different resistors available in caps - perhaps someone else has the definitive answer.  Are your caps lettered ‘R’ ?

Ian

Nurse Julie:
Maybe your plug caps are just very old and the resistors have broken down Erwin 🤔

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