Sxr 1100 jetting
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  1. #1
    PWCToday Regular N3vrSat1sfied's Avatar
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    Sxr 1100 jetting

    Kehien Cdk carbs no accelerator pump,

    Stock is 72p, 120h. The carbs I have had a accelerator pump but itís missing the linkage.

    Itís way to lean right now. I saw one post with 78/130 and accelerator pump. Any recommendations without the pump?


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  2. #2
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Sxr 1100 jetting

    What is it doing?

    Carbs with accelerator pumps generally stiffer springs and leaner
    low jets.

    I have not messed with an SXR/1100 before, but if it is running lean
    with that jetting (and screw positions?), makes me wonder why?

    Dried out 1100 pipe, right? How much is routed to the waterbox?

    What is the impeller size?

    Are you using the green Keihin carb gaskets? If not what gasket are
    you using?


    Bill M.
    Last edited by wmazz; 08-13-2021 at 01:50 AM.
    Horsepower == Speed, RPM != Speed



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  4. #4
    PWCToday Regular N3vrSat1sfied's Avatar
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    Re: Sxr 1100 jetting

    Read thru that. Gonna try the jetting specs in there and hook up the accelerator pump.


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  5. #5
    Top Dog JC-SuperJet's Avatar
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    Re: Sxr 1100 jetting

    As a reference, the Seadoo 951 Accelerator Pump Delete calls for a #95 Pilot change to replace the Stock #80 Pilot Jet.

    These are Mikuni BN-46I Carbs. I know you have Keihins but maybe going up +15 in Pilot Jet size will get you close...

  6. #6
    PWCToday Regular N3vrSat1sfied's Avatar
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    Re: Sxr 1100 jetting

    Quote Originally Posted by wmazz View Post
    What is it doing?

    Carbs with accelerator pumps generally stiffer springs and leaner
    low jets.

    I have not messed with an SXR/1100 before, but if it is running lean
    with that jetting (and screw positions?), makes me wonder why?

    Dried out 1100 pipe, right? How much is routed to the waterbox?

    What is the impeller size?

    Are you using the green Keihin carb gaskets? If not what gasket are
    you using?


    Bill M.
    Dried out pipe, rear water box. 15/24 impeller, green gaskets. Iím thinking itís way lean due to switching flame arrestors and lack of accelerator pump.



    Sent from my iPhone using Tapatalk

  7. #7
    PWCToday Regular N3vrSat1sfied's Avatar
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    Re: Sxr 1100 jetting

    Quote Originally Posted by JC-SuperJet View Post
    As a reference, the Seadoo 951 Accelerator Pump Delete calls for a #95 Pilot change to replace the Stock #80 Pilot Jet.

    These are Mikuni BN-46I Carbs. I know you have Keihins but maybe going up +15 in Pilot Jet size will get you close...
    Appreciate it, got another set of carbs here that have the accelerator pump linkage so Iíll try to get the pump working then try the 78/130 jetting recommended in the first thread


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  8. #8
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Sxr 1100 jetting

    Is your only problem a bog off idle? or is it also hard starting without a
    primer, or will it eventually die if you don't watch the idle speed?

    These are all symptoms of a vacuum leak (not the bog).

    The dried out waterbox is a cause for a bog. A dry water box can be a
    bummer on a starting line.


    Quote Originally Posted by N3vrSat1sfied View Post
    Dried out pipe, rear water box. 15/24 impeller, green gaskets. I’m thinking it’s way lean
    due to switching flame arrestors and lack of accelerator pump.
    The green Keihin gaskets I am familiar with were designed for the aftermarket
    42mm and have the potential to leak because the gasket has a larger id.

    The problem with vacuum leaks will be made worse if you ever disassembled
    the carb rack.

    If you have vacuum leak symptoms; make your own gaskets (and remove the
    stupid dowel pins) with 1/16" FelPro rubberized felt gasket material from your
    local NAPA auto parts.

    If you previously disassembled the rack, did you remove the intake manifold
    and reassemble the rack using the intake manifold without gaskets as a jig?

    Quote Originally Posted by wmazz View Post
    Carbs with accelerator pumps generally stiffer springs and leaner
    low jets.
    Another Sea Doo fix for eliminating the accelerator pump was to remove
    the stiffer (95gr) spring used with the accelerator pump carbs and switch
    to the (80gr) springs used in a regular carb set, and bump up the low speed
    2 sizes.

    The accelerator pumps were put in place not as a performance upgrade,
    but as a smog device because emissions testing was performed at an idle.


    You should start by allowing full water flow (if 3/8") to the water box, but
    keep the pipe dry. This change should fix the bog with your jetting, but not
    if the spring rate is too stiff.

    The low speed jet size and spring rate (or pop-off) are closely matched, and if
    if you read my blog, you can learn the idle drop test and determine if your
    low speed jet is too lean, and by how many jet sizes you need to fix it, while
    the ski is on your trailer backed into the water.

    I had a Zxi 900, and I used a long thin Snap-on screw driver to make the
    changes on the low speed (pilot) screws.

    After you get the acceleration squared away, you can start restricting the
    water to the waterbox by trial & error.


    Bill M.

    If you have some fabricating skills, the Polaris 1050 Keihins with 3 jets can
    be easily modified for arm jerking performance.

    Are the carbs rebuilt? In the past I have had some issues with Chinese Keihin
    carb kits. The Japanese kits from Watcom are oem kits.
    Last edited by wmazz; 08-13-2021 at 07:23 PM.
    Horsepower == Speed, RPM != Speed



  9. #9
    PWCToday Regular N3vrSat1sfied's Avatar
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    Re: Sxr 1100 jetting

    Quote Originally Posted by wmazz View Post
    Is your only problem a bog off idle? or is it also hard starting without a
    primer, or will it eventually die if you don't watch the idle speed?

    These are all symptoms of a vacuum leak (not the bog).

    The dried out waterbox is a cause for a bog. A dry water box can be a
    bummer on a starting line.



    The green Keihin gaskets I am familiar with were designed for the aftermarket
    42mm and have the potential to leak because the gasket has a larger id.

    The problem with vacuum leaks will be made worse if you ever disassembled
    the carb rack.

    If you have vacuum leak symptoms; make your own gaskets (and remove the
    stupid dowel pins) with 1/16" FelPro rubberized felt gasket material from your
    local NAPA auto parts.

    If you previously disassembled the rack, did you remove the intake manifold
    and reassemble the rack using the intake manifold without gaskets as a jig?



    Another Sea Doo fix for eliminating the accelerator pump was to remove
    the stiffer (95gr) spring used with the accelerator pump carbs and switch
    to the (80gr) springs used in a regular carb set, and bump up the low speed
    2 sizes.

    The accelerator pumps were put in place not as a performance upgrade,
    but as a smog device because emissions testing was performed at an idle.


    You should start by allowing full water flow (if 3/8") to the water box, but
    keep the pipe dry. This change should fix the bog with your jetting, but not
    if the spring rate is too stiff.

    The low speed jet size and spring rate (or pop-off) are closely matched, and if
    if you read my blog, you can learn the idle drop test and determine if your
    low speed jet is too lean, and by how many jet sizes you need to fix it, while
    the ski is on your trailer backed into the water.

    I had a Zxi 900, and I used a long thin Snap-on screw driver to make the
    changes on the low speed (pilot) screws.

    After you get the acceleration squared away, you can start restricting the
    water to the waterbox by trial & error.


    Bill M.

    If you have some fabricating skills, the Polaris 1050 Keihins with 3 jets can
    be easily modified for arm jerking performance.

    Are the carbs rebuilt? In the past I have had some issues with Chinese Keihin
    carb kits. The Japanese kits from Watcom are oem kits.
    Not an air leak issue. The gaskets I have line up perfectly with intake manifold. Ski starts and runs perfect out of water, under load it wonít move, it will die. Itís lean for sure. Will be working on it Monday.


    Sent from my iPhone using Tapatalk

  10. #10
    PWCToday Regular
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    Sep 2012
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    Connecticut
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    29
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    127

    Sxr 1100 jetting

    Iím having some issues with my carbs in my 1100 swap as well. Starts and idles fine, but when I go to give it gas it dies out. If I choke it about half way (give or take) it will rev up almost like normal. Did a leak down test with a crappy harbor fright tool and only lost about 1-2 psi in 5 minutes. That was with a set of freshly rebuilt carbs. Tossed a 2nd set on that have worked for me in the past and I was having the same issue when I put them on this ski. Could it be a gasket issue?


    Sent from my iPhone using Tapatalk
    Last edited by Mikespo12; 08-17-2021 at 11:51 PM.

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