Discussion ZXR 250 Carb Slide Mod

Discussion in 'Kawasaki 250cc In-line 4's' started by venom80, Mar 4, 2014.

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  1. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    It will, but you may have to go to a heavier spring if that happens.
     
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    Murdo, Mar 8, 2014
    #21
  2. zixxer

    zixxer Well-Known Member

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    mmmmm this little mod plus a quick action throttle sounds like fun

    i have seen some for sale but they have throttle cables aswell, not sure if they will fit, also saw a throttle grip for a zxr750 that is described as a quick turn but its a genuine kawasaki part and doesnt look any different from the stock tube i have now.
     
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    zixxer, Mar 11, 2014
    #22
  3. ajverma

    ajverma Active Member Premium Member

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    best take your tube to a wrecker and let them match it... otherwise you'll be hunting for a while
     
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    ajverma, Mar 11, 2014
    #23
  4. zixxer

    zixxer Well-Known Member

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    decided to go and get a zx10r throttle tube from an 06, would recommend it, for 20 bucks you cant go wrong.

    doesn't make a massive difference but definitely a shorter turn than the stock tube.
     
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    zixxer, Mar 28, 2014
    #24
  5. Tim_

    Tim_ resident nutcase Contributing Member Dirty Wheel Club

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    Speaking of throttle mods. I'm not a fan of the throttle being in the switch block. And I have a cbr throttle and cables. Has anyone ever tried to put a cbr throttle on a zxr so the throttle is separate from the switch block?
     
    Tim_, Mar 28, 2014
    #25
  6. Phil

    Phil Senior Member Contributing Member

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    Just a question Tim, why the dislike of the throttle cable in the switch block???????
     
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    Phil, Mar 28, 2014
    #26
  7. Tim_

    Tim_ resident nutcase Contributing Member Dirty Wheel Club

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    The switch block on my bike actually slides up and down. I would say the anchor hole is stretched. Also the concept seems odd to me. And it seems like there is a lot more pieces to mis place inside the switch block.
     
    Tim_, Mar 28, 2014
    #27
  8. kiffsta

    kiffsta Senior Member

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    there is a metal anchor on the backside of the switch block, you will need to remove the switch block from the bike, punch back in a bit and line it up with the hole in the handlebar, once its back in properly, it wont move
     
    Last edited: Mar 28, 2014
    kiffsta, Mar 28, 2014
    #28
  9. Tim_

    Tim_ resident nutcase Contributing Member Dirty Wheel Club

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    Cheers kiffsta I will try that tomorrow.
     
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    Tim_, Mar 28, 2014
    #29
  10. Phil

    Phil Senior Member Contributing Member

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    Well Chris got to you first, thought that might have been the issue. Pleased your sorted.:thumb_ups:
     
    Phil, Mar 28, 2014
    #30
  11. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    Good work Venom. I was going to do this (second hole) mod to my drag bike as soon as the basics are sorted. I was going to start with 1mm and see what happened. Given you went to 2.5mm whitout any issues, I'll probably do the same. What the spring mod you're talking about?

    Frank
     
    Frankster, May 3, 2014
    #31
  12. zixxer

    zixxer Well-Known Member

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    would it affect air/fuel at all?
     
    zixxer, May 3, 2014
    #32
  13. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    I don't know. The quicker the bike gets revved up, the quicker it gets in to the next gear and technically it should cover the 1/4 mile quicker. I wouldn't think this mod would have any affect on air/fuel as from what I understand that's metered by the carbs (I'm probably wrong!). The quicker the carbs open the quicker it should rev...right?
     
    Frankster, May 3, 2014
    #33
  14. venom80

    venom80 Loud pipes save live's

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    Thanks, no spring mod it was mentioned earlier in the post that if I go to big I might have to put a heavier spring in to stop the slid flapping around.

    Sent from my GT-I9300T using Tapatalk
     
    venom80, May 13, 2014
    #34
  15. natezx2r

    natezx2r Active Member

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    How did you go drilling out bigger than 2.5mm, Im doing mine to 2.5mm as I type
     
    natezx2r, Oct 2, 2014
    #35
  16. venom80

    venom80 Loud pipes save live's

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    Yeah good I've had no issues with the crabs since works really nicely
     
    venom80, Oct 2, 2014
    #36
  17. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Bumping this thread, I performed the mod to my C model today.

    Based on this thread and the ZXR400 instructions, I went with an additional 2.5mm hole next to the existing hole (also 2.5mm on my carbs).

    Results - improved throttle response when in the correct gear. However, if you are in a high gear at low speed and low rpm, I found that it would bog down and behave far worse than standard. I would say the perceived better performance is worth it.
     
    Linkin, May 5, 2018
    #37
  18. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Exactly as advertised and better than spending $80 on the "Sigma Racing Carb Kit" that gives you a piece of paper and a drill bit. :)
     
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    maelstrom, May 5, 2018
    #38
  19. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    I'm feeling positive as to the difference I'll feel when going for a fang - and yep, for the best price of zero dollars and some of my own time :)
     
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    Linkin, May 5, 2018
    #39
  20. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    I did mine around this time last year, drilled out the 2x 2mm hole's in each slide to 2.5mm
    I did feel a bit of difference to the response
     
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    Last edited: Dec 27, 2018
    my67xr, May 5, 2018
    #40
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