Question about 2005 kawasaki ZZR 400

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Engin looses power between 4 and 8000rpm. The sparkplug on cilinder 4 burnd black, so i replaced all 4 plugs. Started it up and the resalts was the same. Can it be the coil or the pick-ups?

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The problem is the carbs. Is there any water in the gas? Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? (not all bikes have a water trap bowl). Install an in-line fuel filter.

FOR EACH CARB > Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the
carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine.

I strongly suggest you to let the shop take care of the carbs. Cleaning can be a nightmare times four and doing the balancing and sync of the carbs sounds easier than it is. If you do the carb work yourself, then be sure you have a fire extinguisher at hand. I am serious about that.

Please rate this solution. Thanks!

Posted on Apr 19, 2009

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