SOHC.co.uk Forums > CB500/550

re-newing HT leads

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LesterPiglet:
 ;D Does shrinktubing harden? That's still flexible after 30+ years.

Bitsa (Ralph Wright - RIP):
Lester good point,
I replaced mine with the real thing but one thing I have noticed rock hard when cold and so supple when warm.So whats the answer?Go with what your happy with is my view and if no problems stay with it.
Cheers
Bitsa

hairygit:
Are you sure it's the ht leads? Reason I ask is it is very unusual for 2 cylinders to have dodgy ht leads, the fact it's always no 2 and 3 that mess around I'd be checking the low tension side, all the wiring and connectors from the points to the coils, especially the bullet connectors, you'd be amazed how much crud can form in them, and pay particular attention to the join in the wires by the back brakelight switch, another common problem area. If the bolts holding the coils to the frame appear rusty, clean them, better still replace them

florence:
I've never tried this on 500 coils so I don't know whether it is the same but on my CB350K the HT leads seem to be held in with resin.  I put the lead in the vice and pulled really hard on the coil and the lead came out leaving a spike inside the coil.  I was then able to push in a new lead and then seal with glue.  This has worked well for the last twenty years. 

Does anyone else know if this works with the 500 coils?  I have a spare set but I'm reluctant to try it as these bits are not as easy to get as they were twenty years ago.  I didn't mind taking a chance in the past when bits were cheap and plentiful.

Incidently, my 500 also is dreadful in the rain, it goes down onto two cylinders as you describe; I tried smothering the coils in silicon grease but not much better.  It usually takes about five miles in the wet for the engine heat to dry everything out sufficiently well to allow proper operation.

However, the bike is better behaved since I started keeping it under a tarpaulin.

Johnwebley:
thanks all for your help,

in reply to Hairgit,over the years as the lead hardened ,they become more and more difficult to detach from both inner plugs,and the
cap fixing became worse over time,removing the damaged lead end,to give the cap fresh to bite on,has now made them very short!

the above is also the reason I had same problems as Florence ,

the water runs down each lead into the cap,and shorts out,
the outer plug dont have the same problem,

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