SOHC.co.uk Forums > CB500/550

Weak spark?

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DomP:
I'm sure I'm missing something here but I'm having a few firing issues, currently no.2 and 4 are not firing well, if I remove a plug and hold it against the block it won't spark unless I hold it just close so that it arcs.  Touching I get nothing, what is the cause of this, a poor ground connection?

Bryanj:
More likely fouled plug or loose plug cap

Johnwebley:
2 and 4 use different coils, breakers etc,

They are paired 1 and 4
2 and 3

Have you replaced any parts?

Have you got resistance plug caps?

Might be worth checking the resistance, as they get older, they can increase the resistance, causing issues



Sent from my SM-A546E using Tapatalk

DomP:
Doh!  Rich sooty plugs, proper schoolboy error chaps.

DomP:
Or was it?!   The same thing happened today so I pulled all four 'new' spark plugs and tested them with my multimeter, two are showing a resistance between the terminal and the outer body.  Presumably this is indicating a breakdown of the inner core? 

New D7EA plugs ordered from The Green Sparkplug Company so hopefully that will solve that problem, whether my plugs were fakes or somehow I've caused them to fail I don't know.

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