Secondary coil pack

Northern Monkey

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preston, lancashire
On the twin spark the secondary plugs are both plugged into the same coil pack.

My question is this,

Does it spark both plugs at the same time as one will be a redundant spark or is two coils within one unit?

My lower plug on rh side is blackened but other three are spot on

So is it possible for the dual coil pack to fail on just one plug.

Cheers
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The good side below

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And yes I have thought of a career as a hand model
 
The secondary spark is a total loss system.

Your problem could be the main coil breaking down on one side. The secondary plugs are almost always sooty compared to the main plugs..
 
Thanks for that, I was just concerned that only one was blackened

Bike seems to be running fine - just took plugs out for valve clearance checking and it looked odd ,




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