SOHC.co.uk Forums > CB500/550

re-newing HT leads

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peterengland:
my bikes runs like a piece of junk if the rain is on the leads, when I bend them they are cracked etc letting in water, can't I just coat/spray them with something to keep the water out?

LesterPiglet:
I tried that. Nothing worked. I think the leads just break down with age.

AshimotoK0:
On the 750 the internal core often fatigues and breaks at the point of entry into the coil. A few years ago I investigated cutting away the plastic moulding of the HT coil body and found the HT lead is terminated internally to the coil HT secondary with solder onto a brass termination. You can then solder a brand new piece of HT cable to the termination and then remould over with black epoxy putty to seal again and when cured you can file/sand to original profile. This was on CB750K0 coil. My garage is in a right state at the 'mo cos I have an MG Midget languishing  in there, which I need to get shut of,  but once I find the coil I fixed I could tell you the approx. position of the brass internal termination. The rubber outer sleeve was hard to find though as it's very thin walled. Not sure about 500/4 coils but guess they could be similar.

Cheers ...... Ash D

matthewmosse:
I have 2 sets of coils somewhere that have been the subject of this kind of attempted repair, neither worked sufficiently reliable though they were removed more in the remove suspect items and replace to eliminate suspect faults rather that know to be the fault. Inside the insulation I've found a copper spike - if I were to attempt my own repair I would solder to this, rather than rely as the people who did mine, on trying to just push the new ht lead into/ onto the spike and seal with araldite - I'm pretty sure from the green fur found on the ht lead and copper splike that damp got in there within 6 months. I found the ht lead off a roll in a local garden machinery repair shop was really nice and thin but subttle - noticed this on a few stationary engines that I have owned which have had new ht leads. seems to work. I have had to replace a few ht leds due to cracking in the insulation letting them short out in the damp, I was lucky with my 500/4 - it had brand new coils just before I bought it., never had it shorting out due to rain, or my 550 before that, though they did have a reputation for it.

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