How to: restoring your old Unobtainium Champion spark plug cables

Post any technical questions or queries here.
Post Reply
User avatar
MiNiKiN
1275 Cooper S
Posts: 943
Joined: Tue Oct 10, 2017 3:15 pm
Location: Graz/Austria // NN1 4ST previously
Has thanked: 17 times
Been thanked: 9 times

How to: restoring your old Unobtainium Champion spark plug cables

Post by MiNiKiN »

I thought I'd share this restoration guide for the old "Champion" spark plug plugs with you, because recently someone asked me on Facebook to explain how I did it.
Initial situation: I had a set of original ignition cables from my Innocenti Cooper that I actually wanted to keep. Unfortunately, not a single one had conductivity and the plug boots hard as hell. .

To prepare, I bought a set with special crimping pliers and associated terminal contacts (those for the spark plugs and those for the distributor cap) from Amazon. The set cost a hot 38€. (https://www.amazon.de/dp/B082MFZRFH?ref ... asin_title)
On ebay I found an almost matching 7mm green copper braid spark plug cable for next to nothing.

  • In order to be able to remove the age-related hardened spark plug caps from the cable, put them in boiling water with lots of added fabric softener for a few minutes.
  • Immediately afterwards - hold the rubber and pull the cable with terminal out to the rear. It takes a bit of a jolt, but usually it works without causing any damage.
  • Then crimp the terminals from the set to the new cut to length ignition cables. Plunge the spark plug connector into boiling water with washing-up liquid again.
  • Now press and push the cable with terminal end into the still soft spark plug connector boot with a little force, but without kinking the cable!
    Once everythingh is together, clean and test for conductivity!


The crimping tool produced consistent results. Once you get to grips how it works it is like shelling peas.
On the dizzy end I fitted the standard 90deg-crimps as I could not fit the old-style side entry cap to the electronic dizzy.
To finish it of I had my son (who is a keen model builder) paint the embossed "Champion"-writing in white acrylic-paint.

PS: I also looked at the Green Spark Plug Ttd. - but the crimping tool there cost a flippin 150 quid and their green cable has been sold-out for ages. They have the genuine spark plug terminal, but this is - whilst original - inferior to the one I used.

The whole shebang:
#1.jpg

The old cables - not very pretty nor in working order
#2.jpg

All hunky dory again, awaiting paint for the embossed writing
#3.jpg

The crimping set:
#4.jpg
You do not have the required permissions to view the files attached to this post.
Last edited by MiNiKiN on Tue Oct 15, 2024 12:04 am, edited 3 times in total.
Yes I am a nerd: I am researching the Austrian Mini-racing scene of the 60s and 70s :ugeek:
User avatar
Peter Laidler
1275 Cooper S
Posts: 6133
Joined: Sat Jul 15, 2017 5:35 pm
Location: Abingdon Oxfordshire
Has thanked: 27 times
Been thanked: 29 times

Re: How to: restoring your old Unobtainium Champion spark plug cables

Post by Peter Laidler »

GREAT....... Maybe this should go straight into The Knack section
User avatar
cobolman
850 Super
Posts: 107
Joined: Sun Dec 24, 2023 5:46 pm
Location: Plymouth, Devon
Has thanked: 10 times
Been thanked: 3 times

Re: How to: restoring your old Unobtainium Champion spark plug cables

Post by cobolman »

LOVE this! Thanks for sharing.
--
Cobolman. Conservator for:
Marty - 1960 Mk 1 Austin Seven Mini De-Luxe
AndyPen
1275 Cooper S
Posts: 3841
Joined: Mon Jul 24, 2017 5:55 pm
Location: South Wales
Been thanked: 22 times

Re: How to: restoring your old Unobtainium Champion spark plug cables

Post by AndyPen »

Yep, definitely something for the knack section ;-)
User avatar
gs.davies
Site Admin
Posts: 1622
Joined: Fri Oct 26, 2012 2:29 pm
Location: Essex, UK
Has thanked: 14 times
Been thanked: 30 times
Contact:

Re: How to: restoring your old Unobtainium Champion spark plug cables

Post by gs.davies »

User avatar
BAD942B
998 Cooper
Posts: 360
Joined: Wed Apr 05, 2023 6:34 pm
Location: Stratford upon Avon
Has thanked: 3 times

Re: How to: restoring your old Unobtainium Champion spark plug cables

Post by BAD942B »

the crimping tools & terminal kits are available from Vehicle Wiring Products https://www.vehiclewiringproducts.co.uk ... ion&page=2
Chris A
InnoCooperExport
998 Cooper
Posts: 654
Joined: Tue Mar 31, 2020 8:44 pm
Location: The Netherlands
Been thanked: 3 times

Re: How to: restoring your old Unobtainium Champion spark plug cables

Post by InnoCooperExport »

Twas I who asked! Thanks again for the great guide. I have to make up the new cables now so I'm hunting for the bits to do it with but step 1 of removing the old cables and munted terminals from the old WC200 caps has been succesful. I'm very grateful to MiNiKiN for this guide, I'd been in touch with some specialists who told me it couldn't be done and the caps were like hen's teeth now.

If they are completely stuck like mine were I can recommend you wear some mechanics gloves when pulling on the HT leads because not doing so has stripped the skin from my index finger... Mine were so stuck the actual HT lead ended up snapping at the terminal leaving some lead and the terminal inside in two of the plugs. One I got out by putting a screw into the lead that was stuck in the plug and pulling that out, the other I had to shred with a rotary tool like a Dremel and a small roundheaded router bit.
Of course I know what a dipstick is, you get called something often enough you look it up!
Post Reply