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Discussion Starter #1
So at my last session at Road Atlanta a couple of weeks ago, the RC acted funny right as I pulled into the pits. I assumed it was time for new plugs, as we all know how the RC is on rear plugs. Last night I put in new plugs and the rear cylinder isn't firing at all. The coil is arcing to the frame when I put a wire in there, but it looks a little weak. Any ideas?
 

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Could be the coil or plug wire.
Is that the spark is weak, or does it eventually cease firing?
Does your rear cylinder fire when cold and then fail when hot?
I've had coils break down internally when they got hot (internal short).
Are you using OEM coils or the CBR600RR coil-over-plug (COP) kit?
 

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Discussion Starter #4
I mean the rear coil arcs to a ground when I put a wire in it, but it appears weaker than the spark on the front coil when I do that test. Is it possible that it's producing too weak a current to the rear plug, even though it's still giving some power? I'm just not sure what to troubleshoot. Bike does have a PCIII and a TurnOne airbox.
 
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