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Thread: Loss of Power at 5000 rpm "CB400SF"

  1. #1
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    Default Loss of Power at 5000 rpm "CB400SF"

    I'm at a loss as to what's causing a miss fire on my bike. Doesn't matter if it's in neutral or in any gear, but as soon as the bike reaches 5,000rpm, it start missfires a bit.

    It sounds a little like a rev-limiter kind of noise - very constant. It'll clear up around 6.5 / 7 k and then pull to the redline. The bike is extremely smooth revving up to this point with no hint of a fault.

    My thoughts were it was electrical related as it's so constant, doesn't matter where I'm riding, how much throttle, etc, it always does it.

    This Problem come out after when my original igniter box burnt out & i replaced with same one. Checked resistor Modification, No Luck, just have 9 wires at CDI, no resistor connected inside speedo.
    Bike was rev well sound before this CDI box. Any suggestion highly welcomed

  2. #2
    RRzone Elder Justin989RR's Avatar
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    Default Re: Loss of Power at 5000 rpm "CB400SF"

    Well, I think this is more of Gothy's area, but I think your CDI box maybe bad??
    I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.
    Albert Einstein

  3. #3
    RRzone Elite a_morti's Avatar
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    Default Re: Loss of Power at 5000 rpm "CB400SF"

    if it were the restrictor, it would restrict the bike everywhere from 5,500 upwards, so it sounds like that is not your issue. Do you definitely have the correct ignition box?

    you might be well advised to ask at 400greybike in the UK, a lot of knowledgeable lads, though mainly on the CBR400 and VFR400. The knowledge for these little JDM bikes is often interchangeable though.

  4. #4
    RRzone Elite houdini's Avatar
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    Default Re: Loss of Power at 5000 rpm "CB400SF"

    Quote Originally Posted by a_morti View Post
    if it were the restrictor, it would restrict the bike everywhere from 5,500 upwards, so it sounds like that is not your issue. Do you definitely have the correct ignition box?

    you might be well advised to ask at 400greybike in the UK, a lot of knowledgeable lads, though mainly on the CBR400 and VFR400. The knowledge for these little JDM bikes is often interchangeable though.


    +1

  5. #5
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    Default Re: Loss of Power at 5000 rpm "CB400SF"

    OKIES DEAR ALL FRIENDS !
    PROBLEM SOLVED BY DOING MOD THANKS YOU ALL FOR EFFORT

    SHAHID

  6. #6
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    Default Re: Loss of Power at 5000 rpm "CB400SF"

    My motorcycle start up but won't stay started when I put it in first it cut off

  7. #7
    RRzone Elite houdini's Avatar
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    Default Re: Loss of Power at 5000 rpm "CB400SF"

    check your side stand switch

  8. #8
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    Default Re: Loss of Power at 5000 rpm "CB400SF"

    Quote Originally Posted by houdini View Post
    check your side stand switch
    I did I think I'm sell it it has problems

  9. #9
    RRzone Elder bmpyNUKS's Avatar
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    Default Re: Loss of Power at 5000 rpm "CB400SF"

    Selling it is one way to make the problem go away, but there's always a logical explanation for any problem on a machine.

  10. #10
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    Default Re: Loss of Power at 5000 rpm "CB400SF"

    I know but man I need to ride

  11. #11
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    Default Re: Loss of Power at 5000 rpm "CB400SF"

    I need help with a 97 cbr900rr

  12. #12
    RRzone Elite houdini's Avatar
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    Default Re: Loss of Power at 5000 rpm "CB400SF"

    what about your clutch switch

  13. #13
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    Default Re: Loss of Power at 5000 rpm "CB400SF"

    What is that what it look like

  14. #14
    RRzone Elite houdini's Avatar
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    Default Re: Loss of Power at 5000 rpm "CB400SF"

    two black wires that plug into the front of your clutch lever
    also maybe you should get a mechanic to look at it

  15. #15
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    Default Re: Loss of Power at 5000 rpm "CB400SF"

    Quote Originally Posted by shahidmajeed View Post
    OKIES DEAR ALL FRIENDS !
    PROBLEM SOLVED BY DOING MOD THANKS YOU ALL FOR EFFORT

    SHAHID
    I know this is a very old thread but I'm having the exact same problem, when you say MOD do you mean you changed the ignition coil or how did you fix the problem?

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