SOHC.co.uk Forums > CB750

Old coils.

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Johnny4428:
Great advice and comments, all welcome. I think I will probably have a go at repairing if the test on the coils with multimeter proves to be ok. I will of course be interested in viewing any repair videos on this subject too.

Lobo:
Ash, just out of interest, what is the failure pattern of old coils? Is it an ‘easily’ addressed mechanical failure, or a breakdown / degradation of component parts?
Simon

paul G:

--- Quote from: Trigger on December 07, 2020, 11:14:59 AM ---The way Ash does them is spot on.
 I have had a go myself some years ago but, i couldn't get the soldering right and it would not take. Not sure if it was my solder, flux or soldering iron was not powerful enough. I must admit that i am shite at anything electrical so, i leave stuff like that to the experts  ;)

--- End quote ---

Graham,
                 A lot of the old wires oxidize and go black in color.
The best thing to do in that case is use some good old fashioned plumbing solder and leave it to do its stuff for half an hour before using resin cored solder. ;)

AshimotoK0:

--- Quote from: Lobo on December 08, 2020, 12:03:42 PM ---Ash, just out of interest, what is the failure pattern of old coils? Is it an ‘easily’ addressed mechanical failure, or a breakdown / degradation of component parts?
Simon

--- End quote ---

Of all the coild I have fixed, only one was not repairable as the secondary HT winding was low resistance. The main failure is fatigue of the conductor core of the HT leads. I think the failed one had been fitted with a CDi aftermarket ignition. In this instance, if there is no spark plug present or or some kind of break in the HT cable conductor core then the excessive HT created in the secondary can cause 'flashover' and damage the windings.

Bryanj:
Bit of an asside but when laverda put bosch electronic on the 3 cyl just taking a plug out and resting it on the head destroyed the system

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