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  1. #1
    Frequent Poster Miguelxj's Avatar
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    Keihin CDK 2 - Reverse Jetting?

    Is this possible?

    I have a 750sp on a X2 hull and trying to figure out if this can be done on a set of triple jet CDK2 40?

    I managed to get it running OK with the following specs:

    Main 140
    Pilot 80
    Middle 45
    1.6 ns
    18 psi popoff

    PROK flame arrestors (low restriction)
    650 Coffmans pipe


    My other X2 (650 with Sbn44) is setup with reverse jetting and it runs so nice, very snappy throttle!

    Any input or a starting point?

    Thanks in advance!
    MR


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  2. #2
    Attention ***** PWCToday.com Is My Home Away From Home JonnyX2's Avatar
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    Re: Keihin CDK 2 - Reverse Jetting?

    Miguel PM user WMAZZ, he is very keen on reverse jetting and those Keihin carbs
    Quote Originally Posted by Firebird A/C&Heating View Post
    OMG.....Rules for 550 vintage ski class...550 ski riders do not conform to any kind of rules. That is why you are riding a 550 ski in the first place. Rules suck....
    PS...the rule book will be in my 550 pump
    Quote Originally Posted by WB1994
    Listen , stop your cryin' , its only an X2.

  3. #3
    Frequent Poster Miguelxj's Avatar
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    Re: Keihin CDK 2 - Reverse Jetting?

    Tried to a month ago but nothing..


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  4. #4
    Frequent Poster Miguelxj's Avatar
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    Re: Keihin CDK 2 - Reverse Jetting?

    Just looking for some opinions...

    What effect would a different ( bigger) needle and seat have on this setup?

    Is it true that on these carbs, the NS are part of the aluminum body?


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  5. #5
    I dream skis waterhappy's Avatar
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    Re: Keihin CDK 2 - Reverse Jetting?

    I'll ask Wmazz later this week. With a mid range jet I do not believe it is possible though.
    God, family and ski's.

    650sx
    850sxr a/m
    650X2

  6. #6
    Frequent Poster Miguelxj's Avatar
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    Re: Keihin CDK 2 - Reverse Jetting?

    Thanks man!

    I got it running good with the following specs:

    140 main
    80 and 55 pilots

    12 psi popoff

    I have idle now and its snappy. Only thing bothering me is the bogging down in the first 4 or 5 seconds after shuting the engine down...


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  7. #7
    I dream skis waterhappy's Avatar
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    Re: Keihin CDK 2 - Reverse Jetting?

    Bill said he'd check this afternoon. Couple things, are the low speed bypass homes drilled out (larger then 24 thousandths) sounds like the spring was cut to have the pop off that low. The pilots sound s little large. Do you have a restrictor on the fuel return?
    God, family and ski's.

    650sx
    850sxr a/m
    650X2

  8. #8
    Top Dog bandit88's Avatar
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    Re: Keihin CDK 2 - Reverse Jetting?

    That popoff is really low, probably contributing to the bog.
    -95 750SXI
    -86 440 with PJS800 conversion
    -90 TS650

  9. #9
    Frequent Poster Miguelxj's Avatar
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    Re: Keihin CDK 2 - Reverse Jetting?

    Waterhappy: stock unmolested carbs out of a 1994 750 XI supersport.... Only messed with jets and spring.

    Recomended popoff for these carbs range from 10 to 24 psi. With higher popoffs the engine would run lean on low rpms, had to pinch it.

    Bandit: agreed. But as stated, I could not run it on low rpms without low popoff :/


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  10. #10
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Keihin CDK 2 - Reverse Jetting?

    This is somewhat of a duplication of the above post. But the post I am quoting from
    demonstrates that a problem of some kind must exist. The dual carbs should have been
    a simple installation.

    Quote Originally Posted by Miguelxj View Post
    Recomended popoff for these carbs range from 10 to 24 psi. With higher popoffs the engine
    would run lean on low rpms, had to pinch it.
    There is no published Kawasaki pop-off recommendations that I am aware of. Only Polaris
    and the blue 42mm carb (SUDCO). I am certain the pop-off that works with the stock jetting
    is at least 26 to 30psi.

    If the engine was running lean with the stock pop-off and jetting, the real question is
    why? was the engine running lean.


    Bill M.

    A vacuum leak on the reed gaskets is a common cause for a problem
    that exists after an intake manifold switch. BM
    Last edited by wmazz; 08-20-2016 at 10:10 PM.
    Horsepower == Speed, RPM != Speed



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