Question about 2002 kawasaki ZX-6R

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Engine runs, but it will not rev up past 2000-3000 rpms,

Bike has sat for a couple months, went to ride it, started it up and engine will run fine on idle.Just as soon as you try to rev it up, it will rev to 2000-3000 rpm and then stall out like it is starving for fuel, I have checked the air and fuel filters, the fuel pump seems to pump fuel ok. I have drained the fuel tank and put in fresh fuel, still no luck. I can spray carb cleaner or Sea Foam directly into the carbs and I can get it to rev up as long as it is being sprayed. The throttle valves open and close normally when twisting the throttle. Note- the battery was dead and it had to be charged prior to getting engine to start, once it was charged, battery seams ok.

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  • alexcoastal Jan 30, 2009

    Thanks for the info. I have removed the carbs and removed the fuel bowls. They were full of what looked like a clear JELLO. I am in the process of cleaning them now.

  • Anonymous Mar 15, 2014

    Went for an early ride after sitting all winter. Fresh gas and when throttling through the gears it's acting like its ether flooded or starving for fuel. It's falling on its face. At idle you can rev it up and seems fine. But under a load it's not rite. Now it's only 40 degrees out could the cold post an issue?

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  • 126 Answers

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

  • joe Jan 31, 2009

    fantastic!! glad you found the problem.



    i use a bread tie (with the plastic melted off the wire) to clean in through all of the holes in both the main jet & housing and pilot jet. bread tie and some carb cleaner does wonders.



    if you need to soak the carb to get it completely cleaned, let me know. i use a solution that is not harmful on o-rings or gaskets.

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