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  1. #1

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    2002 Polaris Bogging Down

    Lost a lot of power on the last time out. Bogged down, and wouldn't go above 3000RPM
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  2. #2
    Click avatar for tech links/info K447's Avatar
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    Cylinder compression?

    Will it rev to redline out of the water?

    Wake up the MFI display (press Display button), then start engine. Any warning messages, red lamp? Does it say 'REVERSE'?

  3. #3

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    Just did a fuel pressure test, 20psi at the shrader valve.
    Removed the fuel pump/canister, and cleaned the filter with a combo of compressed air and Gumout Carb/Choke Cleaner. The Fuel Pressure Regulator is intact
    Being held in place by a small zip tie.
    Compression Check: 95 psi mag cylinder, 95 psi Center Cylinder, 87 psi PTO Cylinder.

    Probably Needs: Cylinder Hone, New Pistons and Rings.
    Seems to be running lean, the spark plugs are black.

    Any suggestions...looking for that brown colored spark plug tip as a result. Since this is a DI model. I was thinking the fuel wasn't getting into the cylinders.
    I'm going to rebuild the fuel lines, and re-plumb the oil lines.

    Am I on the right track?

  4. #4

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    I just re-checked the Compression
    Mag-Click image for larger version. 

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    PTO-[ATTACH]418622[/ATTACH

    Spark Plugs
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  5. #5

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    Spark Plugs:
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  6. #6

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    Update: I just did a full top end rebuild on this ski, it fires with a little throttle, it'll stay running once you open the throttle a few times and rev it. But, after I had it run for about 15 seconds at idle. We shit it off, and did a compression check.
    Oddly enough, using a HF Pittsburg brand Compression Tester, I got the same numbers as before. 90-Mag, 90-Center, 89-PTO.
    Found some light scoring in the cylinder wall. Cleaned it up as best I could with a honing tool from HF. The old pistons looked like crap. The Mag Cylinder piston looked the best.
    With the WSM Top End Rebuild kit installed, as well as my fuel and oils lines replaced, I was expecting some change in my compression numbers.
    Any thoughts?

  7. #7
    Moderator HiPeRcO's Avatar
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    Try another gauge?

  8. #8

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    I ordered an OTC gauge.

  9. #9

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    Got the OTC Gauge. 150psi across all 3 cylinders. I took the Genesis out this past weekend for the first time since the rebuild. Still have a bogging condition. Iím pointing at the EMM, fuel pressure looks good at 20psi. May have a pressure drop at the time itís bogging. But not too sure. Spark plugs are new and are the NGK Plugs that came stock. One thing thatís throwing me off is the cylinders. Once the ski bogs out, you can hear the cylinders firing and building pressure, then all of a sudden you can hear only the flywheel spinning. Not sure what that condition could mean accept an absence of fuel pressure...this all happened on the water, so I was unable to test for fuel pressure. Anyone have any input?

  10. #10
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by wrenchin510 View Post
    ... took the Genesis out this past weekend ... Still have a bogging condition...

    One thing thatís throwing me off is the cylinders. Once the ski bogs out, you can hear the cylinders firing and building pressure, then all of a sudden you can hear only the flywheel spinning.

    Not sure what that condition could mean ...this all happened on the water ...
    What do you mean, you can hear the flywheel spinning?

    What exactly are you hearing?

    Could you be hearing the Bendix gear whine or the starter motor ?

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