Question about 2000 kawasaki ZX-9 R Ninja

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Backfiring I was riding about a week ago (Not riding hard) and all of a sudden the bike started backfiring and spuddering and would only rev to about 4000 rpms. I continued the 5 miles or so to my house with it doing this. The bike starts and idles fine but as soon as i turn the throttle it starts backfiring. What could it possibly be ??????? Please Help.

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  • Lee Matlock Feb 20, 2012

    Yes I am turning the choke off and it starts and idles fine its just when i give it any throttle at all it starts backfiring

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  • 202 Answers

4000 rpm ???????

Posted on Feb 15, 2012

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Posted on Jan 02, 2017

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SOURCE: Backfiring through airfilter housing

I had the same problem. Does it have trouble idleing? Could be a the needle the goes into the bottom of the carb. I had the same problem and the needle fell out of the bottom.

Posted on Apr 27, 2009

  • 2336 Answers

SOURCE: backfire

Yes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...

Posted on Nov 10, 2008

  • 2336 Answers

SOURCE: backfire

Yes, it could (and probably is) be an air leak. Check to be sure the carb is tight in the intake manifold, and make sure the hot-start isn't loose and is sealing properly. Also make sure all of the exhaust system joints are tight, an air leak in the exhaust will make a four-stroke pop and backfire like an old work truck with no muffler...

Posted on Nov 10, 2008

  • 126 Answers

SOURCE: engine runs, but it will not rev up past 2000-3000 rpms,

are you turning the choke off after its warmed up? most will not run with the choke on and warmed up.

also try running it with the gas cap open to see if you have a vent issue in your tank. if air can't get in, then gas can't flow.

if not a choke or vent issue, then try this. turn the petcock off and then disconnect the fuel lines one at a time going into the carb. start with carb fuel line #1 disconnected (and the rest connected) and in a coffee can, turn petcock on and ignition too. fuel pump should come on momentarily and inject some fuel. see how the quantity looks. reconnect the line to carb #1 and repeat for carbs #2 - #4. your looking for a decrease in fuel to a couple of cylinders.

if all looks fine, i would then focus on the carb floats & jets. have the carbs been off for a good cleaning lately? modern fuel breaks down quickly and could cause a gumming condition in the carbs. spraying the sea foam or carb cleaner into the carbs is bypassing the everything in the carb bowl (but it means the spark plugs are ok) so there could be an obstruction. i would look there first.

if uncomfortable removing the bank of carbs, you can try a quick fix first. with the petcock closed, open the drain screws of each carb and let the gas drain out. go and buy some yamaha carb cleaner (liquid in a black bottle) at a yamaha motorcycle dealer. mix it in a separate container with gas as recommended. close the drain screws on each carb. pour the mixture into each fuel line feeding the carb and let it sit overnight. DO NOT POUR THIS MIXTURE INTO YOUR TANK. its not a fuel additive, but a cleaner that will not harm orings or gaskets, but it will not ignite with a spark plug. open the drain screws the next morning and let the mixture pour out. reconnect the fuel lines to the carbs and test drive it.

if that didn't work, then removing the carbs for a good cleaning is my next step. good luck.

Posted on Jan 28, 2009

  • 1 Answer

SOURCE: 07 kawasaki kx250f backfires

Hey i have several solutions for you.
The first is have you checked valvue clearence lately, because if the valvue clearence is either to high or to low then it could cause it to back fire. The next solution is repacking your silencer. The next solution is there is two main gaskets in most dirtbikes, one, which is located where the pipe mets the motor. Also the other gasket it where the mid pipe meets the head pipe. The bike fire is usually being caused by extra air. By the way checkin valvue clearence is extremley easy it may sound hard but I do after every ride.

Posted on Jun 30, 2009

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