Coils breaking

[Marmalade]

I've just fixed a Broken pan euopean, It died while moving, engine cut out and won't restart.

Plenty of power at the lt side of coils but a tiny spark on HT. Replaced the coil unit and it's all good but it is one bracket with 2 little coils on it.
Why would both pack up at the same time?
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Nobby the Bastard: How yo tell the difference between the actual japanese and her just screaming because she's had live fish stuck up her arse? [url=https://www.nicks-shop.co.uk/bcf-goodies-15-c.aspGet BCF stickers and things here[/url] Reflective helmet stickers - Legal requirement in france - Clicky

[cb1rocket]

Age and vibrations I would guess. Also the coils breaking up could of spike the other coil and broke that up too?
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Honda H100S2 Rebuild - https://www.bikechatforums.com/viewtopic.php?t=253852

[doggone]

Are you able to test the voltage they are getting, if something else was giving out you could be getting intermittent big spikes.
It does seem suspicious, I've ridden a bike 300 miles home from Kent running on one coil and two cylinders, don't see any way the remaining good coil would get too much juice.

[Marmalade]

They work on a 3 wire mini loom with one supply and 2 neg pulses so i suppose it could spike with one breaking but highly unlikely.

It works now. I can send it back to the owner and see what happens.
____________________
Nobby the Bastard: How yo tell the difference between the actual japanese and her just screaming because she's had live fish stuck up her arse? [url=https://www.nicks-shop.co.uk/bcf-goodies-15-c.aspGet BCF stickers and things here[/url] Reflective helmet stickers - Legal requirement in france - Clicky

[Nobby the Bastard]

Both failing at the same time? Very unlikely.

Is there any possibility it's been on one coil for a while and that the owner hasn't noticed the lack of power?

It's a Goldwing after all...
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[moonzoomer]

Common coil fault normally means a common ground or earth fault , check any and all earth to chassis connections starting from the battery onwards and check the main earth connection between chassis and engine for corrosion. Also check the killswitch for wear and/or corrosion.

[Marmalade]

[Marmalade]

[misscrabstick]

[misscrabstick]

Ohh had a thought some cars will shut down the ecu if a coil gets a funny resistance reading (broken coil), maybe the ignition control module got a weird voltage feedback from one bad coil and it shut down in protest making the other coil stop sparking too, I had this happen to a customers car once, a mazda mx5, one coil had shorted windings and the other stopped sparking too.

[Marmalade]

[misscrabstick]

Taken any primary/secondary resistances?

[Marmalade]

didn't bother, just chucked them in the shed
____________________
Nobby the Bastard: How yo tell the difference between the actual japanese and her just screaming because she's had live fish stuck up her arse? [url=https://www.nicks-shop.co.uk/bcf-goodies-15-c.aspGet BCF stickers and things here[/url] Reflective helmet stickers - Legal requirement in france - Clicky

[Easter Bunny]

[Marmalade]

[Easter Bunny]

[Walloper]