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steady throttle position but jerky response ?

  1. #1
    Posting Freak danny86's Avatar
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    steady throttle position but jerky response ?

    At low RPM's ( basically under 40mph) when the throttle is steady the bike still jerks a lot. Its not smooth at all.

    I'm thinking its the map on the PCIII ?

    Its an 07 CBR1000RR

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  2. #2
    Lifer SprintPoser's Avatar
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    Re: steady throttle position but jerky response ?

    Possibly, but look to synchronizing the throttle bodies first.

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  3. #3
    Dictionary quoting knob stoinkythepig's Avatar
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    Re: steady throttle position but jerky response ?

    Pull in the clutch and make sure it's not undulations in the pavement.

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  4. #4
    Lifer DaveZX6r's Avatar
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    Re: steady throttle position but jerky response ?

    Have you checked your chains slack? Too much will do that too.

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  5. #5
    Lifer SprintPoser's Avatar
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    Re: steady throttle position but jerky response ?

    With 740 posts and being here 3 years, I would assume the guy knows the difference between bad pavement, a loose chain, and a throttle that isn't responding well. I'd at least give him the benefit of the doubt.

    Degsy?

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  6. #6
    Super Moderator TheIglu's Avatar
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    Re: steady throttle position but jerky response ?

    Eh, Degsy just talks funny, doesn't make a bike do that. I would look elsewhere.

    TPS adjustment is my bet.

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  7. #7
    Lifer SprintPoser's Avatar
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    Re: steady throttle position but jerky response ?

    Quote Originally Posted by TheIglu View Post
    Eh, Degsy just talks funny, doesn't make a bike do that. I would look elsewhere.

    TPS adjustment is my bet.
    Degsy knows those kind of bikes really well and is good at analyzing issues like that and fixing them. If he's not available or too far away, perhaps he can recommend someone else. Yes, it could well be the throttle position sensor, or perhaps a dirty fuel filter, clogged air filter, poorly adjusted valves, throttle bodies out of synch, any number of things.

    See also:

    http://www.nestreetriders.com/forum/...ine-cycle.html

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    Last edited by SprintPoser; 05-26-12 at 11:14 AM.
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  8. #8
    Lifer DaveZX6r's Avatar
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    Re: steady throttle position but jerky response ?

    Quote Originally Posted by SprintPoser View Post
    With 740 posts and being here 3 years, I would assume the guy knows the difference between bad pavement, a loose chain, and a throttle that isn't responding well. I'd at least give him the benefit of the doubt.

    Degsy?
    Fair enough, however I disagree entirely with your assumption that a high post count equals bike knowledge. There are plenty of people on here with hight post counts that dont touch anything on their bikes.
    Also I can reccomend to check the easy stupid stuff alot more than saying take your bike to a dyno and spend hundreds of dollars getting it tuned which may not fix your problem.

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  9. #9
    Lifer SprintPoser's Avatar
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    Re: steady throttle position but jerky response ?

    I did NOT suggest anything about spending big bucks on a dyno tune. No idea where you got that impression, so I'm sorry if I wasn't clear.

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  10. #10
    Lifer DaveZX6r's Avatar
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    Re: steady throttle position but jerky response ?

    And I'm sorry if my post came off assy. I don't have my acs in yet. And the dyno was a response to the op, because thats where the only info we have on possible symptoms came from.
    Quote Originally Posted by danny86 View Post
    At low RPM's ( basically under 40mph) when the throttle is steady the bike still jerks a lot. Its not smooth at all.

    I'm thinking its the map on the PCIII ?
    Its an 07 CBR1000RR

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  11. #11
    Back marker... jwm2k3's Avatar
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    Re: steady throttle position but jerky response ?

    Synch the TB's and get a custom map on the dyno. It will be sweet....

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    Johnny

    Its an Italian bike...Ive had (have?) a few

  12. #12
    Professor of Philosphy Cerberus's Avatar
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    Re: steady throttle position but jerky response ?

    first thing i would do would be to throw some seafoam injector cleaner through it..
    and go beat on it for a tank of fuel

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  13. #13
    Dictionary quoting knob stoinkythepig's Avatar
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    Re: steady throttle position but jerky response ?

    You've probably already checked this, but a very worn chain can cause the symptoms you describe. If the chain has uneven wear, some sections will be quite a bit longer for a given number of links than other sections. I had a Regina chain do that a couple of years ago and it felt just awful at low speeds, felt like surging.

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  14. #14
    Professor of Philosphy Cerberus's Avatar
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    Re: steady throttle position but jerky response ?

    Oh, btw.. if it happens around 5500 rpm, there's not a lot you can do about it. that is the transition from lower injectors to both banks of injectors.. they all do it, and there's no known fix (last I knew)

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  15. #15
    #331 CBR929RE's Avatar
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    Re: steady throttle position but jerky response ?

    Quote Originally Posted by Cerberus View Post
    Oh, btw.. if it happens around 5500 rpm, there's not a lot you can do about it. that is the transition from lower injectors to both banks of injectors.. they all do it, and there's no known fix (last I knew)
    a good tune with a PCV or Bazzaz should fix it since they control both sets of injectors

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  16. #16
    Posting Freak boloson's Avatar
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    Re: steady throttle position but jerky response ?

    Did u try unplugging the pc and run it stock?

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