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Discussion Starter · #1 ·
Put in some brand new NGK plugs and rode a couple hundred miles. Here they are. What do you think these are telling me?

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Discussion Starter · #4 ·
One is oil fouled ( bad rings, bad valve seal or both?)
That's what I thought. Thanks for helping confirm. I'm a bit new to reading plugs. This is the CB200 that despite the fresh rebuild (new rings and all new seals+gaskets, valve lapping, etc) only tests about 100 psi per cylinder.
 
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