SOHC.co.uk Forums > CB350/400

HT Leads on coils

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royhall:
Discovered yesterday that after the initial superb results with the 350F that I now have a 3.5 cylinder bike.

When I put the coils on (originals) I noticed that one HT lead was turning in the coil and was quite loose. But decided to go along with them anyway.

Not sure at this point if its on the bad running cylinder (Christmas duties prevent vital garage time, Bah Humbug) but from memory I think it may be.

Anyone else had this problem.

Cheers and Happy Christmas.

hairygit:
It is very likely to be your problem. H.T. circuits don't like loose connections, they can make and break with the vibrations from the engine, or road bumps etc, at least it's an easy fix!

Sent from my D2303 using Tapatalk

gtmdriver:
If you replace the coil or coils take care that you get them with the same primary coil resistance.

The Honda coils on my CB350F had a primary resistance of 4 ohms but the replacements from David Silver only had a 2 ohm resistance which would have drawn far too much current through my Boyer ignition unit. I had to fit a pair of 1.6 ohm ballast resistors in series with the 12v supply.

AshimotoK0:
VERY common problem with those coils and Cb twins coils. I am supposed to be writing up how to fix this step by step with pics.  Will do it next week as I have two sets to do and I now have all of the materials . BUT I can't find a sourceof the thin rubber sleeving on the outside of the HT lead to make it look original.

Ash

Gixxer-18:
Hi Ash, try googling this stuff, it's not cheap, and it's branded, but that branding should be removable with MEK. It's about 1mm wall when heated and shrunk. Use the 12/6 size 12mm to 6mm. I've got it on some of the boats wiring in the engine room.
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It might not be of any use but it's a lead!
Regards
Nigel.

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