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Thread: 1999 Genesis

  1. #1

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    1999 Genesis

    Having problems with a 1999, 1200 Genesis. Previous owner said it worked perfect. Put in the water idles good, but only goes 20mph. The gauge cluster had moisture in it, so we replaced hoping that would solve the problem. Made no difference. Did crank test and crank was out of phase. Installed brand new crank. Put back in the water, and still no difference. Only goes 20mph and 4500 rpm. If you take the seat off and run it like that it goes 45 mph, at 5500rpm. Need help trying to figure out the problem.


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Welcome back

    What happens when you bypass the MFI?

    Is this a fuel injected or carburetor engine?

    If running with the seat off makes a difference, then you probably have an exhaust leak inside the hull.

    Check all the rubber exhaust hoses for softness or internal collapse. Remove them and check inside if there is any question.

    Good exhaust hoses will be very firm under your hand, although sometimes a hose can fail internally and still seem good on the outside.

    If the engine was ever run for more than a short time without proper water injection cooling into the exhaust pipe, the exhaust system can overheat and internally damage/melt the rubber hoses.

    The 1999 Genesis is different from all other Polaris models and years. It has dual under the hull exhaust outlets, with a Y connector in the exhaust system. Make sure all the hoses are properly connected, not damaged, and correctly routed.

    Check the exhaust water injection filter screen and injection orifice.

    45mph at 5500RPM is still way too slow. Properly running that engine will sustain above 6500RPM and top speed in the mid-high 50s.

    You may have several problems that need to be found and corrected.

    Has this machine ever run properly for you?

    Where are you located?
    Update your Profile

    Post some photos of the engine area.

  3. #3

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    The MFI was replaced with a brand new one, but still does the same thing. All hoses to do with the exhaust have been all replaced. Still doing the same thing. This is a carbed machine. Never has run properly for me, but the previous owner said it worked properly?? Could it be the reeds.. Any other suggestions.

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    Quote Originally Posted by deere View Post
    The MFI was replaced with a brand new one, but still does the same thing.

    All hoses to do with the exhaust have been all replaced. Still doing the same thing.

    This is a carbed machine.

    Never has run properly for me, but the previous owner said it worked properly??

    Could it be the reeds?

    Any other suggestions.
    Bypass the MFI and test. Only takes a minute to do.

    When you rebuilt the engine (new crank installed), were the reeds visually checked?
    New gaskets in the intake when re-assembled?

    Were the carbs rebuilt?

    What is the cylinder compression (throttle held wide open, all plugs removed)?

    When the engine was rebuilt, did you do a leak down test?
    Might have a leaky gasket or seal somewhere in the engine.

    Exhaust leaks can occur other than at the rubber hoses. Manifold, water box, hull exits.

    The RPM improvement when ventilating the engine area by running with the seat off means you either have an exhaust leak, or the air intakes into the hull are plugged.

    Have you ohm checked the stator coils, and tested the Hall Effect sensors?

  5. #5

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    Reeds were not inspected. New gaskets in the intake installed. Carbs not rebuilt. Compression test 140. What would a leak down test consist of? Hull air intakes not plugged. Did not test that staor or sensors.

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    Quote Originally Posted by deere View Post
    Reeds were not inspected.
    New gaskets in the intake installed.

    Carbs not rebuilt.

    Compression test 140.

    What would a leak down test consist of?

    ...Did not test that stator or sensors.
    Hmmm.

    Those carbs are 11 years old. Unless you are sure they have been rebuilt in recent memory, and are internally clean and have no problems, they should be rebuilt now.

    These high-output 2-stroke engines do not tolerate even one carb with gummed up passages or hardened/worn/stuck internal parts. You can burn a piston down in very short order, sometimes minutes or less.

    Does the engine still have the original gray Tempo brand fuel hoses?
    If yes, not only do you need to replace all the hoses, and the fuel filter, but you need to rebuild the carbs. The Tempo fuel lines create a green goo that clogs up the carbs.

    Leak down testing has been described in other threads. Involves sealing up the intake and exhaust, then pressurizing the engine (just a few PSI), and watching for pressure drop over several minutes.

    If the pressure drops rapidly, it indicates gasket or crank shaft seal is leaking. Air leaks into a 2-stroke engine cause the cylinder(s) to run lean, which is very bad for engine longevity.

    If the previous crankshaft was twisted out of phase, then it is likely the engine ingested liquid water. Often that also damages the pistons and/or rods, and possibly the reeds.

  7. #7

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    Do reeds off a 2002 fit a 1999? By the way thanks for all your info..

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    Quote Originally Posted by deere View Post
    Do reeds off a 2002 fit a 1999?

    By the way thanks for all your info..
    I think reeds from any model/year of domestic engine are interchangeable. You can cross check the part numbers with Polaris Industries Parts cross-reference and diagrams

    Reeds can be checked visually, once you have them out of the engine.

    Take the time to make sure the engine really is ready to run. Check everything.

    Just because it runs now (sort of) doesn't mean there aren't other problems ready and waiting to damage the engine once you do get the power and RPM up to where they should be.

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