SOHC.co.uk Forums > CB500/550

Ignition Coils recommendation

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florence:

--- Quote from: Oddjob on September 01, 2023, 02:12:03 PM ---You tried fitting a silicon sleeve over the HT lead like the original Honda ones had? If you can fit it right up to the coil and right up to the sealing rubber on the HT cap that should stop any arcing

--- End quote ---

Good idea, there is a gap, might use shrink tubing.  (I was worried I might seal moisture in)

Bryanj:
Do the Ash repair on standard coils with the sleeving

philward:
I've done about 4 sets of standard coils using Ash's guide and all good so far. As you are fitting new leads, it should logically sorrt the arcing. Coil values are in Ashes guide in 'Ash's Dropbox'.

Seabeowner:
Weak spark can be caused by the long current path to coils. I've fitted a fused relay to supply the +12 direct to coils.

deltarider:
For a good working ignition good and firm contacts are essential. It's well possible that someone attributes improvement to a new part he or she has fitted, while in reality the connection was redone and now as it should have been before.
Here are a few connections which deserve attention:
HT lead - plugcap (you may also check the caps resistance).
The Y connector primary side where the Bk/W wire devides in two.
Contactbreakers: the little bolt in the breaker must be securely fastened to prevent a wandering dwell
                          make sure their connectors do not ground intermittently.
In general: plugcaps are the CB500/550's Achilles heel.
My approach always is, that I don't replace any part before I have diagnosed what is wrong.
I have not been lucky with R(esistor) spark plugs.
Having run OEM and 3Ω coils, I can conclude that the primary resistance doesn't matter so much, as long as it is in between 3 and 5Ω.
Be aware that some aftermarket coils may have the connector 'gender' wrong.

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