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  1. #11
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: CDK2 needle/seat

    Unfortunately That is what I was afraid of. Wish I had some good advice.

    You could try the pop-off test with the lever set to 1mm below the
    gasket surface, the needle and seat wet, and the carb fully assembled.
    But that is mainly testing the base of the needle and seat. But it is
    worth a try.


    Bill M.
    Horsepower == Speed, RPM != Speed



  2. #12
    Frequent Poster TomM1's Avatar
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    Re: CDK2 needle/seat

    I set the lever like you showed earlier and that didnít seem to make much difference. I stretched the spring out a bit and that just added ~5lbs until it bubbled. I am testing flooded with premix just no cover on so I can see bubbles.

    You did see that I experienced similar results with an OEM needle and seat that was untouched just swapped the whole block over from another carb ? I tried the used needle and 2 new needles and all were similar. Find it hard to believe has to be something going on here I am missing.
    Last edited by TomM1; 06-15-2022 at 05:56 PM.
    SWIMMIMNG!!!

  3. #13
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: CDK2 needle/seat

    Quote Originally Posted by TomM1 View Post
    You did see that I experienced similar results with an OEM needle and seat that was untouched just swapped the whole block over from another carb ?
    Yes I saw that. 24psi sounds a little low? Is that with an aftermaket
    rebuild kit spring?


    Bill M.
    Horsepower == Speed, RPM != Speed



  4. #14
    Frequent Poster TomM1's Avatar
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    Re: CDK2 needle/seat

    2 different OEM springs, 1 aftermarket spring - all similar. ~ 25psi is where it starts bubbling, no pop. Only thing I can think of is that possibly the 4 screws that hold the cover/block on need to be installed because the single screw in the center is not enough some how that is affecting it. Also I normally plug the return port with my thumb this time I used a 12 inch piece of tube. I mean im really grasping at straws now
    SWIMMIMNG!!!

  5. #15
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: CDK2 needle/seat

    Quote Originally Posted by TomM1 View Post
    Only thing I can think of is that possibly the 4 screws that hold the cover/block on need to be installed because the single screw in the center is not enough some how that is affecting it.

    I mean im really grasping at straws now
    Agreed, but it is worth a try.
    Horsepower == Speed, RPM != Speed



  6. #16
    Frequent Poster TomM1's Avatar
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    Re: CDK2 needle/seat

    Installed the 4 corner screws left cover off and it is greatly improved. I am still getting a stream of very fine bubbles here and there but holding enough to get a consistent pop at around 35 psi.
    SWIMMIMNG!!!

  7. #17
    Frequent Poster TomM1's Avatar
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    Re: CDK2 needle/seat

    Tested this a few more times and really not holding - very inconsistent. I have 3 of these carbs and all act the same way. I am not familiar with the keihins my only experience with them is removing the CVs from the 1200s, throwing them out and swapping mikunis so I dont know if this is normal. Unless someone chimes in and tells me this is normal I am done with it because I have no confidence in it. Could have bought 2 new carbs with all the time and money I have wasted on it. Does anyone know if an sbn38 will bolt onto the keihin intake? I see they sell adapters for the 44s but cant find any info on the compatibility of the 38 bolt spread.
    SWIMMIMNG!!!

  8. #18
    Frequent Poster TomM1's Avatar
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    Re: CDK2 needle/seat

    Quote Originally Posted by wmazz View Post
    Unfortunately That is what I was afraid of. Wish I had some good advice.


    Bill M.
    When you say you were afraid of this did you mean that this is a problem these carbs typically display or you figured there would be an issue with the replacement seat?
    SWIMMIMNG!!!

  9. #19
    Frequent Poster TomM1's Avatar
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    Re: CDK2 needle/seat

    No one has any experience checking pop off on these carbs ? Possibly someone has one they could check and see what the results are if they are the same as what I am getting
    SWIMMIMNG!!!

  10. #20
    PWCToday.com Is My Home Away From Home WFO Speedracer's Avatar
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    Re: CDK2 needle/seat

    how do the carbs run on the ski ?
    Y'all know me, still the same O.G. but I been low-key
    hated on by most these &^$$@s with no cheese, no deals and no G's, no wheels and no keys, no boats, no snowmobiles, and no skis, mad at me cause I can finally afford to provide my family with groceries

    WWSRD , What would Speed Racer do ?

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