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its not unheard of for new plugs to be bad, i had 3 out of 4 on the mrs' cbr600f that failed/never worked when i changed them over.i put the old ones back in, and she ran sweet again! when i put the new ones in the cap and earthed them, no spark.....held them an inch from the frame and big sparks from plug to frame, and big spark across electrode gap!

when you have established which cylinder is not firing, try swapping plugs about, and see if the misfire moves with it
 
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