Question about 1997 kawasaki ZX-9R Ninja

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Engine missfire I have a kawasaki zx9r b4,and after 30 seconds the engine develops a missfire.I have changed the plugs and leads,fuel pump and fuel pump solenoid.I have checked the coils,cdi,fuse box and cleaned the carbs out.when setting off the bike will start to missfire,if you pull out the choke,it will go normally for about two seconds then start missing again.I have finally run out of ideas as to what this could be. oh yes and compression is well within limits. thanks

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  • tracey_binne Mar 05, 2009

    I solved the problem,there was two small vacume pipes that run under the headlight.Although the zx9 runs carbs,it still has a pressurised air box.The two vacume pipes under the headlight cause a negative pressure wave to make the bike run properly when moving.If one of the clips is missing(like in my case)the bike will miss its nads off when under load.


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This sound like a crab deal for sure. when you cleaned the carbs did you take out the main and needle jets.if so carb cleaner my not work you will have to blow these jets out with with high pressure air and make sure you do all for carbs.

let me know how it gos

Posted on Jan 25, 2009

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