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Hi guys,
I've got two 2007 CBR600RR racebikes and they are both getting strange damage to the spark plug terminals.

I found it on my first bike when it got so bad it was actually making the bike cut and and out. I found this damage to the plug terminal (where the cap sits on) and its like its arcing and melting the terminal. I put fresh plugs in and its fine but I'm sure it'll happen again.

On my new racebike i bought I found the same wear on the plugs when I changed them.

Is this a common thing? I'm guessing that maybe the spring thing that contacts with the terminal could be dodgy. On both bikes it doesn't do it to all plugs. I thought it was just a loose cap or something but im sure its not. The only thing I can think to do is to replace the coils? It could be an expensive exercise knowing Honda too.



Thanks
Marty
 

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Seems like the coil wasn't fully seated on the plug... Try to put a spark plug into the coil off the bike, is it tight?
 
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