Jetting Guru's! Dual 3 jet Keihin CDK2 40's help! - Page 13
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  1. #121
    PWCToday Newbie
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    Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Will do, I've been doing some tinkering with the pole spring tension and ride plate shimming so I'm itching to test it out and see if i need a different plate or not, will probably have the next tank at the correct ratio since i believe 5 gallons should have been enough to set the rings

  2. #122
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    Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Also which way do i install the r&d reed stuffersScreenshot_20190515-141340_eBay.jpg

  3. #123
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    Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    I tried backing the fuel screws back in a tad and it got hesitant, so as it sits im at 1.75 low and 1.5 high and it likes it there....

  4. #124
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Interesting. Are you still on 32:1?

    If they look symmetric and fit both ways I wouldn't worry about the direction. I can't remember off the top of my head. Also this is one of those mods that makes you feel better but it's hard to discern any improvement. At least from my memory. On my ported / higher $$ engines, I usually run VForce 3 reeds with stuffers and intake manifolds all ported and smoothed out for no steps or transition issues. But on the limiteds there is so much to gain in a variety of areas I don't worry too much about stuffers.
    1985 JS550/800 "Pretty Red": Newmiller 800, Rhaas 750 pump conv. [56.3mph gps]
    2009 1100 SJ:
    Kawi 1100 build in progress
    2009 SJ MINT:
    KP steering adaptor, Worx 228 intake [45.8mph gps]
    1987 WJ650:
    6M6, JD Intake Grate, 17/20, cheater pipe [47.8mph gps]
    1994 XiR: 830cc Superstock, PJS side draft, 13/18 swirl [53.7mph gps]
    1998 SXI PRO:
    3DR hull mods [TBD]



  5. #125
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    Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Ok I'll just use my best judgement on them, still not sure why my fuel screws need to be so far out since I'm running richer Jets then you have, but it seems to run great where i have it at so I'll probably just leave it there and ride! And I'm at 50:1 ratio

  6. #126
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Interesting. I have not tried drilling out the lower transfer holes as Bill indicated, although I do have a second set of carbs entirely devoted to this. Just on the back burner for now, as this engine is my back up for my (now ported 800) swapped 550. Maybe that's the difference? Bill with those holes drilled, will the carbs just naturally flow more and require more jet / screw settings compared to carbs with the holes stock?

    None of the other skis we have jetted have had those holes drilled either. We literally had one magic set of carbs which was on my 550/750 that I tinkered with for a long time with Bill's help. Once we got them running awesome we started copying the settings to other sets of 3 jet carbs in our group. I was pretty astounded how we could literally take the exact settings and go from ski to ski. It was completely independent of ski hull type, pipe, waterbox, ect..

    I'm actually so happy with those carbs I'm thinking of rebuilding and porting that 750. If I do that, then I might sell the 800 which is currently the primary engine, lol.
    1985 JS550/800 "Pretty Red": Newmiller 800, Rhaas 750 pump conv. [56.3mph gps]
    2009 1100 SJ:
    Kawi 1100 build in progress
    2009 SJ MINT:
    KP steering adaptor, Worx 228 intake [45.8mph gps]
    1987 WJ650:
    6M6, JD Intake Grate, 17/20, cheater pipe [47.8mph gps]
    1994 XiR: 830cc Superstock, PJS side draft, 13/18 swirl [53.7mph gps]
    1998 SXI PRO:
    3DR hull mods [TBD]



  7. #127
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Quote Originally Posted by theVetteman3 View Post
    Interesting. I have not tried drilling out the lower transfer ((2)) holes as Bill indicated
    That is something that will help all Kawasaki Keihins, but Polaris
    Keihin's and Mikuni SBN's come stock at .024"


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



  8. #128
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    Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    So would going to a single sbn44 yeild any benefit over the dual 40s?

  9. #129
    PWCToday Guru scottw090's Avatar
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    Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    they are easier to dial in in my opinion. Either option can be fast.

  10. #130
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Jetting Guru's! Dual 3 jet Keihin CDK2 40's help!

    Quote Originally Posted by Jdbarnes89 View Post
    So would going to a single sbn44 yield any benefit over the dual 40s?
    Most people want it easy, and not learn how to tune or jet their
    carbs. The basic steps to rejetting a Mikuni are the same as a
    Keihin. I cover power tuning and the idle drop test in my blog.

    The standard jetting and acceleration of a 44-46 sbn is mediocre in
    comparison to the 3 jet Keihins. If you want more performance from
    an SBN, you have a few alternatives. The main one is modifying
    the low speed by-pass holes to increase acceleration. But that mod
    creates a horrible bogg that can be jetted out by reverse jetting with
    a low pop-off pressure. That jetting can cause engines to load up, so
    you need another mod to lower the fuel pressure. This mod is better
    for experienced tuners or to be purchased from someone that sells
    aftermarket modified carbs.

    Another version to increase the acceleration of a SBN is reverse
    jetting with a hi pop-off. You can read about that in my blog.

    ==================================================
    Jdbarnes89, I still need to know if you're fuel lines are still connected
    to the On-Off-Reserve fuel selector.

    There was another person that required a richer jetting, he was from
    Spain, and I need to find his posts.


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



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