Ninja 500R Running Rough
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Thread: Ninja 500R Running Rough

  1. #1
    GSX-R 750 Array Reimche's Avatar
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    Jun 2007
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    Kamloops
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    2003 gsx-R 750

    Ninja 500R Running Rough

    My wifes 2002 Kawi Ninja 500R has been running rough for a while now, but she hardly rides it so it has not become much of an issue until now.

    What it's doing is:
    Weird idle upon startup (sometimes higher revs and sometimes lower/stalls)
    Throttle does not seem responsive at lower RPM's
    Just seems to generally run on the rougher side

    Just bought a new battery for it and will test it tonight.

    Are there any ways to test for a vacuum leak?
    Could it be the Carbs just need cleaning?
    Possibly need to replace spark plugs?

    I have done a fair amount of work on my own bike (03 GSX-R 750) but don't have any experience with carbureted engines so I am not sure where to begin troubleshooting.

    Any help would be greatly appreciated
    Last edited by Reimche; 08-24-2010 at 02:40 PM.

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  3. #2
    Registered User Array StevieMac's Avatar
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    Apr 2007
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    Vancouver
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    Ninja250 + a few
    I'd start by pulling the carbs and cleaing out the pilot jets.
    WMRC & PCMRC #49

    StevieMac- Any and all advice provided by me is of the "Use it at your own risk" variety. Common sense and your own good judgement must always prevail.

  4. #3
    awful human Array bottomfeeder's Avatar
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    Quote Originally Posted by Reimche View Post
    My wifes 2002 Kawi Ninja 500R has been running rough for a while now, but she hardly rides it so it has not become much of an issue until now.

    What it's doing is:
    Weird idle upon startup (sometimes higher revs and sometimes lower/stalls)
    Throttle does not seem responsive at lower RPM's
    Just seems to generally run on the rougher side

    Just bought a new battery for it and will test it tonight.

    Are there any ways to test for a vacuum leak?
    Could it be the Carbs just need cleaning?
    Possibly need to replace spark plugs?

    I have done a fair amount of work on my own bike (03 GSX-R 750) but don't have any experience with carbureted engines so I am not sure where to begin troubleshooting.

    Any help would be greatly appreciated
    It sounds like there is some gunk caught in one or both of the pilot jets. It is likely that if you add half a can of seafoam to a full tank of gas and ride the bike for about 15 minutes and park it overnight it will make a real difference.

    You can find seafoam at napa auto parts stores. Around $12.



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  5. #4
    Registered User Array Mechannibalism's Avatar
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    Jul 2010
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    east van
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    '87 GPZ 400 '87 GSXR 400
    Yup sounds like fuel level or gack in the carbs, take them apart and clean 'em out, your lucky there is only two. To check for vacuum leaks get some brake cleaner (or any thing like that that has Acetone in it) and spray it around the areas that might be leaking --the engine will pick up revs when you find a leak. GO EASY WITH THE SPRAY CAN

  6. #5
    GSX-R 750 Array Reimche's Avatar
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    Jun 2007
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    Kamloops
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    2003 gsx-R 750
    Put a new battery in and it is significantly improved. Wonder if it was possibly a bad connection on an already bad battery.

    Thanks for all the input

  7. #6
    Registered User Array Mechannibalism's Avatar
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    Jul 2010
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    east van
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    '87 GPZ 400 '87 GSXR 400
    It could be a very loose batt. connection or a bad Battery It would'nt be the first time I've run into a new Batt. that unexpectedly opened.

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