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  1. #1

    What will I need to install a kawasaki 1100 engine into my 2003 STX900 hull???

    I am trying to find out "FOR SURE" if the non-DI 1100cc engine will install right into my 2003 STX900?

    I am not getting enough straight answers so I will try to post in this category of Greenhulk (conversion).

    From what i can see, the 1100 set up looks identical to my 900STX set up wich makes me think its a straight swap, goes right in.

    I just need a confirmation that this is possible and what i would need to replace, if anything else, in addition to the engine?

    Here are some facts I have gathered:

    All STX1100 with the new gen. hull (My Hull) is Direct Injected.
    All STX1100 with pre-gen. hull is carburated.
    All STX900, even with new gen. hull is carburated
    All ZXi1100/ZXi900 have the same powerplant as the carburated STX models (My powerplant)

    Given the facts above, If indeed they are correct, I will then conclude that the pre-gen STX1100 (not DI) and all ZXi100 engines will fit my hull and drivetrain with no modifications needed.

    Can someone please confirm the facts I have just listed and also confirm the this engine swap is possible as "straight swap". Before i invest $1000 on a 1100cc engine, I would like to be clrear about this.

    Any info will help,

    Thanks.


  2. #2
    thesepaperwings's Avatar
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    A swap is doing able but I checked and the 1100 has longer rods so the timing will be different. The pump will hook right up but choosing an impeller is up to you because the nozzle bore is not the same. If you are getting this for power then make sure you get the right carbs. The 98 1100STX came with the same carbs that the Ultra 150 uses. These are not meant for power but will do much better on gas. If you are going to do performance mods then I would move to premix. Everything should fit. The mounts are the same and the cables are the same.

  3. #3
    I've owned both 900 and 1100 new and old and the power difference on water is not worth the money spent, i just put together an 01 sts 900 and its is on par with my old 99 1100 stx, I actually think this 01 would be side by side with it, so unless your 900 is a throw away I wouldn't invest the time or money,

    But yes its a straight swap, and i even think the 03 had the 148mm pump too

  4. #4
    thesepaperwings's Avatar
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    My 98 1100stx ran 54 and my 99 900stx ran 49 on a good day. The hole shot is about the same. If you are going to mod then you would want the 1100 so you could do some motor work.

  5. #5
    My intention is to do motor work into a 1100 then swap into my STX900 hull. I am shooting for 60mph GPS after the groupK sleeper mods.

    Right now my 900 runs 52.4mph GPS with a full tank, I am actually pretty happy with that performnace from the 900 engine but I want more.

    I really like to keep my hull, I just need to figure out what would be the best and most effective way of getting more power.

  6. #6
    Quote Originally Posted by winterstick View Post
    I've owned both 900 and 1100 new and old and the power difference on water is not worth the money spent, i just put together an 01 sts 900 and its is on par with my old 99 1100 stx, I actually think this 01 would be side by side with it, so unless your 900 is a throw away I wouldn't invest the time or money,

    But yes its a straight swap, and i even think the 03 had the 148mm pump too
    I will also need the ignition system from a 1100 right, different timing?

  7. #7
    thesepaperwings's Avatar
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    Yes, diferent timing. That is a really good speed for a 900. Are you looking to do the hammer kit or just the sleeper?

  8. #8
    Quote Originally Posted by thesepaperwings View Post
    Yes, diferent timing. That is a really good speed for a 900. Are you looking to do the hammer kit or just the sleeper?
    Not sure yet, what would be the main difference?

  9. #9
    thesepaperwings's Avatar
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    Race gas= rip your arms off big bore
    sleeper= fast but under control

  10. #10
    I have a '96 ZXi 900 & a mate has an '01 ZXi 1100. The pumps are different & I think the coupler & possibly driveshaft also.

    I have ridden a few of these skis & never noticed a great deal of difference in power. I copied this from a review of the ZXi900.......

    Kawasaki ZXi 900 - The little brother of the Zxi 1100 was never considered a "high performance" competition machine. It suffered from the same problems with excessive weight, and serious speed reductions from aftermarket plates and grates (intended to abate the porpoising). This said, there are lots of "good condition" used (read good bargain) 900s out there. More recently, Aqua Sports (in Torrance Ca.) has been converting the 900s into 1100s. This modification transforms the docile, slightly overweight, 900 into a low-cost pump gas pocket rocket (62-63 mph). The smaller prop used on the 900s allows for better acceleration than the 1100 motor delivers with the larger 1100 pump. Furthermore, the smaller 900 carbs (if used) yield better fuel consumption than the accelerator pump 1100 carbs. All these mods do not make the 900 good in rough water, but they do elevate the otherwise wimpy 900 into the upper crust of the smooth water grudge racers...at a good price. End Quote!

    My 900 will kill nearly any kawasaki 1100 carby ski. I get 60MPH out of it on flat water with a stock pipe but my motor is fairly worked. I have a Nitro injection system that I made myself that adds about 300rpm & 3MPH.

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