Dual CDK II Tuning Struggles

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  1. #1
    PWCToday Newbie tthede's Avatar
    Join Date
    May 2016

    Dual CDK II Tuning Struggles

    1995 SXi (Silver Big Pin Engine)
    Dual CDK II Carbs
    Engine rebuilt with +1.5 Wiseco Pistons this spring (150/150)
    OEM Crank Seals
    Only things not stock are the pistons
    Carbs rebuilt this Spring, OEM Kits, Stock Jet Sizes
    Carb settings set to stock from the service manual
    del rio, TX (Hot!!!) 1,000 ft elevation
    27 psi Pop Off in each carb

    I am having trouble eliminating a throttle bog. A smooth application of the throttle will get you up to speed and it has great top end. A punchy application of the throttle will cause a hesitation and can even kill the engine. Engine is in 5-7 hr range since rebuild. I thought I had it tuned perfect when I left Iowa (cooler and 500 ft.) but not in TX. Is this a lean condition or a rich condition. I included pictures of pistons and plugs (not chopped) but I'm not sure if that is helpful. What is going on and how can I fix it?

  2. #2
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Jun 2006

    Re: Dual CDK II Tuning Struggles

    Just now starting to get a bit of a wash pattern but spark plugs look great! Does it clear up if you open the low speed screws an extra 1/4 turn?

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

  3. #3
    PWCToday.com Is My Home Away From Home mcn6's Avatar
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    Apr 2006

    Re: Dual CDK II Tuning Struggles

    Hesitation off idle indicates lean and blubbering indicates rich. Since you still have the stock flame arrestor it is probably something simple like Myself mentioned = turn the low speed needles out until it quits hesitating coming off idle.

    Home of Newmiller Machine

  4. #4
    PWCToday.com Is My Home Away From Home WFO Speedracer's Avatar
    Join Date
    Aug 2006

    Re: Dual CDK II Tuning Struggles

    Personally I like to work from rich to lean, I turn them out about two turns the turn them back in till it works like I want it to.
    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 ?

  5. #5

    Re: Dual CDK II Tuning Struggles

    What impeller?

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