Question about 1997 kawasaki ZX-7R

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Mis-fire WHEN BIKE IS RUNNING WILL MIS-FIRE AND IF THROTTLE IS OPENED FULL WILL ONLY REV @ AROUND 1500 FLAT OUT . FAULT NOT PRESENT ALL THE TIME AND WILL SEEM TO CLEAR ON OCASSIONS.

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  • works693 Feb 11, 2009

    HAPPENED YESTERDAY AND REPLACED HT LEADS AND FULLY CLEANED THE PLUGS WHICH WERE NEW ABOUT 4 MONTHS AGO .

  • works693 Feb 11, 2009

    ALL WAS OK RIDING HOME LAST NIGHT BUT THIS MORNING RIDING INTO WORK WAS MIS-FIRING AND NO REAL RESPONSE FROM THROTTLE. CUT OUT WHEN CLUTCH OPERATED THEN RESTARTED. WAS MISSING THEN CLEARED ITSELF AGAIN

  • works693 Feb 16, 2009

    after changing the leads and cleaning the plugs ran fine . no water evidence in the bowls or tank. but again this morn played up with missing

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These tiny spark plugs will foul easily just from normal choking or even in-town riding at low throttle. Sounds like one or more cylinders drops out at times. Pull and clean the plugs, especially inners ( #2 and #3.) The sooty look is not far from a misfiring condition, so get them good and clean. Sometimes spraying firing tips with carb cleaner and then burning them with an oxygen/acetylene or other type torch can help bring back good firing metal. Unless you have a clogged carb or jet from dirty fuel or running without air filters. I bet the bike comes to life at higher rpms right? Fouling plugs. Numero uno cause for this symptom. THanks TT

Posted on Feb 11, 2009

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  • Patrick Dennehy Feb 11, 2009

    Still seems like a spark delivery issue, especially since it clears up, then reappears. Did it clear up right after you cleaned the plugs and changed HT leads? Or no effect at all?

  • Patrick Dennehy Feb 11, 2009

    When I have a ragged condition like this, I still read the plugs first. By now, maybe taking the tank off is getting quicker? Read 'em and see if they aren't sooty already. Or is one gas-fouled or wet? One more dry or different from the rest? Choke been behaving ok?

  • Patrick Dennehy Feb 12, 2009

    Any chance your petrol is contaminated with water, or getting old? Could be a batch of bad fuel; especially if spark delivery is not to blame. You ride it today? Later, Tater Todd

  • Patrick Dennehy Feb 16, 2009

    What's the resolution, guys?

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