1996 ZXI 1100 hesitation/stalling
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  1. #1
    PWCToday Newbie Serkit's Avatar
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    1996 ZXI 1100 hesitation/stalling

    Hello

    I Got a 1996 ZXI 1100 giving me nothing but headaches. Ski has less then 50 hours on the original motor. Ski looks brand new and is FAST.
    All stock except for the impeller, GPSed at 57.2mph.

    Reason for my post is i am having some hesitation/stalling issues. From a idle, 70% of the time when you slam the throttle the ski will just die, if the throttle is feathered it runs fine, gets right to top speed and GOES. There are times the ski will have a bad hesitation and not die when u pin the throttle (30%ish).

    Air leak at carbs tested- Negative.
    Carbs completely rebuilt with OEM Keihin parts, popoff pressure tested, new accel pump diaphragm. I have taken carbs off now 2 times adjusting the low speed adjustment and i just cant seem to get this thing running right.

    Compression is perfect in all 3.
    3 new plugs, wires shaved.
    New OEM fuel filter.

    Low speed adjustments-
    1-1/8 turn the ski would not idle below 1500 rpm in the water without dying. (still had issue with hesitation/stalling)

    1-1/3 ski idled at 1250 in water(what the manual claims it should be at) didnt seem to really sound like a smooth idle but idk. (stalling seemed to be worse, i could not get it to accel to full unless i feathered 100% of time).

    When i raise the idle adjustment screw on the ski to around 2kRPM in the water (3500 RPM out of water) the ski has 0 hesitation or stalling problems. (which is almost double the idle the manual says to be at, ski does like 8mph at 2k so i cant be going down my canal like this haha).

    What the hell is my problem?? Im stumped.

  2. #2
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 1996 ZXI 1100 hesitation/stalling

    Quote Originally Posted by Serkit View Post
    From a idle, 70% of the time when you slam the throttle the ski will just die
    Don't slam the throttle!


    Bill M.

    What you are complaining about is normal for most carbs no matter
    what kind of vehicle it is.

    Please don't use different colors again
    Horsepower == Speed, RPM != Speed



  3. #3
    PWCToday Newbie Serkit's Avatar
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    Re: 1996 ZXI 1100 hesitation/stalling

    No vehicle is considered "normal" that dies when given any type of throttle.

  4. #4
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 1996 ZXI 1100 hesitation/stalling

    Quote Originally Posted by wmazz View Post
    What you are complaining about is normal for most carbs no matter
    what kind of vehicle it is.
    When I trained to be a mechanic, we spent an entire quarter on "carburetion"
    and that was literally one of the first things we were taught.


    Did you confirm the accelerator pump actually works? the squirters
    do get plugged up.

    When you rebuilt the carbs, did you disassemble the rack? (hopefully
    you didn't, but if you did say so) what is the lever position set to,
    what size is the low jet, and did you replace the carb base gaskets?

    How did you test for vacuum leaks?


    Bill M.

    Even if you did everything right, it is still possible the rider is the problem.

    Your thread reminds me of a few perfectionist customers who thought
    their motorcycle warranty covered this perceived problem, or flat spots
    in the powerband.
    Last edited by wmazz; 05-16-2019 at 07:02 PM.
    Horsepower == Speed, RPM != Speed



  5. #5
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 1996 ZXI 1100 hesitation/stalling

    Quote Originally Posted by Serkit View Post
    All stock except for the impeller, GPSed at 57.2mph.
    What impeller is in the pump? Has it been modified?


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



  6. #6
    PWCToday Newbie Serkit's Avatar
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    Re: 1996 ZXI 1100 hesitation/stalling

    Quote Originally Posted by wmazz View Post
    When I trained to be a mechanic, we spent an entire quarter on "carburetion"
    and that was literally one of the first things we were taught.


    Did you confirm the accelerator pump actually works? the squirters
    do get plugged up.

    When you rebuilt the carbs, did you disassemble the rack? (hopefully
    you didn't, but if you did say so) what is the lever position set to,
    what size is the low jet, and did you replace the carb base gaskets?

    How did you test for vacuum leaks?


    Bill M.

    Even if you did everything right, it is still possible the rider is the problem.

    Your thread reminds me of a few perfectionist customers who thought
    their motorcycle warranty covered this perceived problem, or flat spots
    in the powerband.
    perfectionist. The jetski stalls and shuts off when giving it throttle. You should ask for a refund for your “quarter” on “carburetion” if your going to sit anywhere and tell someone that a machine that dies when it’s suppose to be accelerating is a “rider” issue. This is a jetski not a motorcycle, you pull the throttle and the ski goes, if a hesitation was all I was experiencing that’s one thing, that’s not the case.

    gunna pull accelerator pump apart again, seems as though there’s suppose to be a U ring on the shaft and a o ring on the housing which is not listed on certain diagrams of the carburetors. I will post findings.
    Last edited by Serkit; 05-16-2019 at 11:09 PM.

  7. #7
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 1996 ZXI 1100 hesitation/stalling

    What Impeller is in the pump?


    Bill M.

    important details

    when did the problem start: before or after the first carb overhaul?

    Did you ever find a problem inside the carbs?

    When you rebuilt the carbs, did you disassemble the rack? (hopefully
    you didn't, but if you did say so) what is the lever position set to,
    what size is the low jet, and did you replace the carb base gaskets?

    Did you replace the spring when you rebuilt the carbs?
    Last edited by wmazz; 05-16-2019 at 11:27 PM.
    Horsepower == Speed, RPM != Speed



  8. #8
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 1996 ZXI 1100 hesitation/stalling

    Have you dried out the pipe and/or the waterbox?

    Any mods to the waterbox?



    Bill M.
    Last edited by wmazz; 05-17-2019 at 12:11 AM.
    Horsepower == Speed, RPM != Speed



  9. #9
    PWCToday Newbie Serkit's Avatar
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    Re: 1996 ZXI 1100 hesitation/stalling

    Quote Originally Posted by wmazz View Post
    What Impeller is in the pump?


    Bill M.

    important details

    when did the problem start: before or after the first carb overhaul?

    Did you ever find a problem inside the carbs?

    When you rebuilt the carbs, did you disassemble the rack? (hopefully
    you didn't, but if you did say so) what is the lever position set to,
    what size is the low jet, and did you replace the carb base gaskets?

    Did you replace the spring when you rebuilt the carbs?
    Not sure what impeller is in it, I know it was a high performance one from previous owner. Problem seems to be the same since I got the ski. I did disassemble rack, what lever are you talking about. Carbs were synced as per manual after reassembly. Low jets are stock. Spring was replaced with OEM spring and pop off tested after.

    no mods to water box and itís completely clear.
    Last edited by Serkit; 05-17-2019 at 03:18 PM.

  10. #10
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 1996 ZXI 1100 hesitation/stalling

    Quote Originally Posted by Serkit View Post
    Not sure what impeller is in it, I know it was a high performance one from previous owner.
    Quote Originally Posted by Serkit View Post
    no mods to water box and it’s completely clear.
    There are a few problems with how watercraft owners perceive impellers and
    the way manufactures market them.

    Many people look at impellers as though they were gears, or sprockets. Basically
    if you purchase and install a larger impeller, you are going to gain top speed.

    The manufactures market their impellers on the idea of stock replacements and limited
    and modified engines have more HP, so they can turn a greater pitch impeller. But not
    all limited engines can pull a larger impeller, and most mods need to run stock impellers.

    The point is that impeller performance is a balance between load and available HP,
    and even with the stock replacement impellers there is a big difference in the zxi 1100
    leading edge pitch. That increase in leading edge pitch increases acceleration, but it also
    increases the load on the engine during acceleration.

    If the waterbox was drilled out by the previous owner to help improve top speed,
    or the water box is running dryer than stock (because the front cover is filled with
    sand, or the incoming brass fitting on the exhaust manifold is partially blocked), it
    is very possible that there is a off the idle bogg caused by the waterbox and impeller
    because an empty water box leans out the jetting, and the impeller increased the load.

    This after the idle lean spot goes away afterwards because the waterbox fills with
    water and increases the back pressure, and in turn enriches the jetting.

    Quote Originally Posted by Serkit View Post
    Problem seems to be the same since I got the ski.
    I still think that slamming the throttle is a poor way to evaluate any vehicles performance.

    Despite that opinion, I can advise you possibilities and how to recognize vacuum leaks, repair
    and tune your carbs. For example, I can show you a better method for discovering vacuum
    leaks.


    Quote Originally Posted by Serkit View Post
    I did disassemble rack, what lever are you talking about.
    What is important, is how you reassembled the carbs?? I need to know.

    See the attachment for lever details.

    Quote Originally Posted by Serkit View Post
    Carbs were synced as per manual after reassembly.
    There are other methods to evaluate carb sync.


    Quote Originally Posted by Serkit View Post
    Spring was replaced with OEM spring and pop off tested after.
    I just don't know what to believe sometimes, you stated that you tested the pop-off
    per specs from the manual, but there are no pop-off specs in the OEM manual.


    I prefer not replacing springs, and I not sure about some of your answers. Most people
    get kits that contain springs for a Polaris Keihin carb.

    I need specifics to justify my time, or it isn't worth it.


    Bill M.
    Attached Images Attached Images
    Last edited by wmazz; 05-17-2019 at 05:25 PM.
    Horsepower == Speed, RPM != Speed



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