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Idle rpm to low?

This is a discussion on Idle rpm to low? within the Mean Streak Maintenance forums, part of the Kawasaki Mean Streak category; I can't get my idle speed over 750 rpm with the adjustment knob turned all the way. Bike is 100% stock. Throttle and intakes are ...

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  1. #1
    Up-And Comer njcwc's Avatar
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    Idle rpm to low?

    I can't get my idle speed over 750 rpm with the adjustment knob turned all the way. Bike is 100% stock. Throttle and intakes are clean. Any ideas???

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  3. #2
    Site Elder razir66's Avatar
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    Are you sure the idle knob is actually moving the screw? It's kinda goofy because the plastic tube that connects the knob to it actually twists without moving anything, you have to twist it pretty good to get it to move the screw...
    2006 Black Mean Streak, Kawi 2-up seat, CWI Mini-Backrest/Rack,
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    Up-And Comer njcwc's Avatar
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    It turns easily and the idle does go up. It feels like it hits a stop and gets tight. I haven't gone to the end of the cable yet to see what is happening. I hoped this might be a common issue and would ask before digging in. Thanks.

  5. #4
    Supreme Being streak07's Avatar
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    I'm pretty sure there's an actual adjustment screw that you can get to if you take all the breather/intake crap off. It's the set screw that the throttle pulley rests on. I'd get in there and check it out as a next step.

    It could be that your idle adjustment screw needs some lubrication similar to your throttle cables needing regular maintenance.

  6. #5
    Supreme Being Tom_E's Avatar
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    Been a while since I've been in there but I think you can adjust the adjuster so you're back in it's range of ajustment. Seems I ran into this. You'll have to pull the right side "faux" air cleaner (and maybe the tank) to get to the throttle body to gain access.

    Might put your year/model in your info somewhere visible, it helps to know what you've got and what you've done.

  7. #6
    Up-And Comer couger's Avatar
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    idle

    my o2 ms seemed to miss at idle speed of 1000 rpm. At 750 it idled good and sounded good. I took it to the dealer and the head mechanic who has been working on Kawasakies for years said that even the carborated models can have this particular miss between 1000 and 1300 rpm. He said he could chase the idle all day but not to be concerned about it. I asked about whether the lower idle rpm could be to low for good oil pressure. He said no, as the bike will quit at 400 rpm.

  8. #7
    Supreme Being twowheeladdict's Avatar
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    OK, how can you all tell you are idling at 750 or 800? My tach doesn't have but one tick mark between zero and 1000 and the distance is so small you would have to use a tachometer testing device (like the pro's have in their toolbox) to dial it in to exactly 800 RPMs.
    Skill is what keeps you on two wheels.

    Situational awareness combined with skill is what keeps you out of harm's way.

    ATGATT combined with Situational Awareness and Skill means you might live to ride another day when that deer runs into your bike or that drunk blows through that stop sign.


  9. #8
    Supreme Being Tom_E's Avatar
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    Quote Originally Posted by twowheeladdict View Post
    OK, how can you all tell you are idling at 750 or 800? My tach doesn't have but one tick mark between zero and 1000 and the distance is so small you would have to use a tachometer testing device (like the pro's have in their toolbox) to dial it in to exactly 800 RPMs.
    That mark just above the needle at rest is 500 rpm. The ignition does shut off if you drop the rpm too low, Couger's 400 rpm sounds right. Mine is set at 750-800 rpm. This gets obsessed over alot.

    It gets repeated over and over that if you let the idle rpms drop too low (below 900 usually) you'll starve the top end for oil and the world will end. I've seen nothing to support this and if you ask for specifics the discussion ends. Seems another example of "internet parrots" mindlessly repeating mis-information they read in a never ending loop.

  10. #9
    Site Elder razir66's Avatar
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    Here is a link to a thread on another forum that discusses this even though it's a bit off topic for that thread.

    http://www.kawasakimotorcycle.org/fo...mal-panic.html

    RichLockyer has a link to photos of his oil pressure gauge while increasing and decreasing idle. It's hard to see, but it appears that the pressure drops a bit when it goes below 8 or 900 rpm. It doesn't seem to drop much so who knows what that actually means as far as 'bad for engine'. I'm happy with my idle around 1k.
    2006 Black Mean Streak, Kawi 2-up seat, CWI Mini-Backrest/Rack,
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  11. #10
    Supreme Being Tom_E's Avatar
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    Quote Originally Posted by razir66 View Post
    Here is a link to a thread on another forum that discusses this even though it's a bit off topic for that thread.

    http://www.kawasakimotorcycle.org/fo...mal-panic.html

    RichLockyer has a link to photos of his oil pressure gauge while increasing and decreasing idle. It's hard to see, but it appears that the pressure drops a bit when it goes below 8 or 900 rpm. It doesn't seem to drop much so who knows what that actually means as far as 'bad for engine'. I'm happy with my idle around 1k.
    Yes, oil pressure drops at idle. It does this in everything. You don't need much oil pressure at idle. "Rule of thumb" on a motor with hydraulic lifters has always been that if you have enough oil pressure/flow to keep the lifters pumped up you're ok.

    I'm not a fan of the ICSs. Mine are on a shelf in my garage. With a PCIII and no ICSs you can get a nice stable consistent idle. Not having the ICSs will require using the "choke" if you like to start the bike and leave it sitting idling "warming up".

  12. #11
    Up-And Comer njcwc's Avatar
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    Thanks for all of the info.
    njcwc

  13. #12
    Up-And Comer 02 Streaker's Avatar
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    Quote Originally Posted by njcwc View Post
    It turns easily and the idle does go up. It feels like it hits a stop and gets tight. I haven't gone to the end of the cable yet to see what is happening. I hoped this might be a common issue and would ask before digging in. Thanks.
    Found this on my 02... There is a spring and a little flat washer on the idle screw where it screws into the throttle body. The boss that it threads into has a flat machined into it and on mine the washer would **** sideways because of the way the spring is made and "lock" the screw from turning. Remove the flat washer and oil the threads and it will work really smooth then.

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    I don't have any problems adusting my idle, but have found that if I set it below 850 rpm that I have sluggish throttle response from idle and that it will sometimes spit back through the intake if I bump the throttle too quickle from idle. I have to keep mine set around 900 and the idle will increase if I sit in traffic and the bike gets really warm (enough for the fan to come on).

    I've checked for vacuum leaks and throttle cable play and these are fine.

    Any ideas?

    The bike is a stock 09 SE.
    Madperson (AKA Teddy Bear)
    2008 Mean Streak SE Memphis Shades Shield, MM angled risers, Leatherlyke Bags, Arlen Ness Rad 3 mirrors (black), Mapam forwards (black) with swing wing pegs, ISO flame grips with throttle boss, Hard Krome exhaust w/tips, Mustang Seat, PCIII, Spike Intake, luggage rack. 2 configurations when I'm done one as a solo, the other as a tourer.

  15. #14
    Supreme Being Tom_E's Avatar
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    Quote Originally Posted by madperson View Post
    I don't have any problems adusting my idle, but have found that if I set it below 850 rpm that I have sluggish throttle response from idle and that it will sometimes spit back through the intake if I bump the throttle too quickle from idle. I have to keep mine set around 900 and the idle will increase if I sit in traffic and the bike gets really warm (enough for the fan to come on).

    I've checked for vacuum leaks and throttle cable play and these are fine.

    Any ideas?

    The bike is a stock 09 SE.
    A PCIII pretty well fixes all of the above. They're a good thing even on an otherwise stock MS.

  16. #15
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    I was really looking more for suggestion for troubleshooting the problem, NOT a bandaide.
    Madperson (AKA Teddy Bear)
    2008 Mean Streak SE Memphis Shades Shield, MM angled risers, Leatherlyke Bags, Arlen Ness Rad 3 mirrors (black), Mapam forwards (black) with swing wing pegs, ISO flame grips with throttle boss, Hard Krome exhaust w/tips, Mustang Seat, PCIII, Spike Intake, luggage rack. 2 configurations when I'm done one as a solo, the other as a tourer.

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