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  1. #1

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    2002 RX DI Rebuild

    I am in the process of obtaining a 2002 RX DI that needs a top end for sure. I am trying to deduce the root cause rather than just replace the top end and have it blow up on me 1 month later.

    The guy I'm getting it from says he ran premix but running premix on and DI engine seems like a great way to clog fuel injectors, which could easily create a lean condition. Is my intuition right?

    Any other ideas of things to check? This will be my first DI engine to work on...

    Is there a known good way to test/clean the seadoo 951 injectors?


  2. #2
    African-American
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    Cannot premix DIs. They are all very hard to keep running well. You can not bypass the oil pump and use premix the way you can with all other 2 strokes. DIs, as the name states, injects the fuel directly into the combustion chamber and it does not circulate around the crank shaft. Your engine will last no more than 5 minutes without the oil pump.

  3. #3

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    I'm starting to wonder if that's why the guys engine blew up. I'm hesitant to buy it without knowing the root cause.

  4. #4
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    take a pass a DI with an unknown problem is a money pit for sure. Unless you have a pile of engines and assorted for it laying around

  5. #5

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    Quote Originally Posted by nmpeter View Post
    take a pass a DI with an unknown problem is a money pit for sure. Unless you have a pile of engines and assorted for it laying around
    You take that stance on any DI engine or just the seadoo 951? I found a kawasaki 1100 di as well...

  6. #6
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    Quote Originally Posted by bsouth19 View Post
    You take that stance on any DI engine or just the seadoo 951? I found a kawasaki 1100 di as well...
    \

    The Seadoo 951 uses the Orbital Fuel Inecjtion syst em, Kawasaki uses Fitch.

    While both are direct injection we seldom refer to the Kawasaki system as DI, typicall called fitch.

    Far less expensive to repair a fitch system as most parts are available and you can often get by on those without needing a code scanner to diagnois stuff.

    Most importantly, the fuel pumps and other vital parts are widely available

    do keep in mind that emm repairs on the kawasaki can run $500 or better.

    Run away from a kawasaki that looks like it's been jump started, or has a burned out starter. These will often need an EMM repair also.

    great ski, quick starting great power and can be used on lake meade and some other restricted waterways.

  7. #7

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    Excellent info.

    Is there am easy way to diagnose a failed or failing EMM?

    I am being told the jet ski starts but has bad compression so no power

  8. #8
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    fact that the engine starts is good.

    low compression is not obvioulsy

    how low is it really? How many hours on the clock?

    "no power" could be for a host of reasons, some related to the jetpump.

    If you see it run, if there is no check engine light on you can make an assumption there is no significant problem in the injection

    could be as simple as a CPS about to crap out ( under $100 and easy to replace)

  9. #9
    Myself's Avatar
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    If it blew because he was premixing a DI........it will need EVERYTHING. Crank bearings, and CB bearings will be shot, air compressor probably ruined, etc.

  10. #10

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    Quote Originally Posted by Myself View Post
    If it blew because he was premixing a DI........it will need EVERYTHING. Crank bearings, and CB bearings will be shot, air compressor probably ruined, etc.
    confirmed today it was never premix-ed

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