Fixing old coils

[roverfj1200]

My old 88 has had some trouble with moisture for a few years now. It would miss and splutter after being washed or in heavy rain, As part of the refit for this bike I thought I would track this problem down. What I found was some cracking in the under side of the old coils. I have a set to replacements but thought I would look at a fix first. I cleaned the cracks and coil bodies with a contact cleaner and then dried them. I then used a epoxy resin glue to fill the cracks. Once installed I run water over the coils and washed the bike as well. This would have had it missing before but now all good. Time will tell if this is a permanent fix or not.

https://youtu.be/1mfffmOJgnM

[Troyskie]

Nice one mate 

I've a bunch of old coils that could benefit from this fix.

I wonder how well areldite will cope with the heat?

[roverfj1200]

Nice one mate 

I've a bunch of old coils that could benefit from this fix.

I wonder how well areldite will cope with the heat?

Not sure how heat will affect the glue and I'm sure a slower drying epoxy would work better. have seen a piece where sikaflex   was used to good affect.

[ribbert]

... have seen a piece where sikaflex   was used to good affect.

Well done Richard, some folks spend forever trying to track down elec faults like that.

The fact it was Sikaflex is irrelevant, all you are doing here is keeping moisture out. Even good 'ol Selleys "Roof 'n' Gutter" or pretty much any silicone or polyurethane based product will do the job. If you have a tube of RTV on the go, that stuff's not only suitable for the temp but fuel and oil resistant as well. I like flexible products where there is a large temp range, even with plastics.

These sort of repairs were common on cars in the 70's and 80's with CDI's and other engine bay mounted electronics where the circuit board filler would craze/crack with heat. Dust would have the same effect if driving on or following another vehicle on unsealed roads.

You had success with epoxy, but to anyone considering this repair, just about anything will do the job, even chewing gum, all you are doing is keeping moisture out.

Noel