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  1. #1
    work hard..play harder! gruba's Avatar
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    back for more wisdom

    96 sl 780, pto cyl. fouling plugs quickly, lots of exhaust smoke and runs a little rough at low rpms, hits 6500 rpm, 55 mph and all else seems to be great. I cleaned carb, replaced diaghram, needle and seat, fuel lines and filters. Is the next step rings? or is there something else that I should try? Comp is good, it is 4 or 5 lbs lower than the other 2, but within specs. The plug is black and sooting. Help


  2. #2
    Race, wreck, repeat delagem's Avatar
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    Post your actual compression numbers, that will help.

    Premix or still injected oil?

    Pic of the piston tops, or at least the spark plugs, always helps.

    Speed actual on GPS or dreamometer?

    Horseheads, where the heck do you ride? I'm in Homer, NY

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Double check the carb settings.

    Make sure the carb isn't dripping when throttle is closed.

  4. #4
    work hard..play harder! gruba's Avatar
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    Compression is 123, 124, 119 in that order front to back, it is still oil injection and the speed is from the dreamometer that came on the ski, also had a buddy on a 08 seado run along side to check it, and his read 52.6, while mine read 53, still pretty good if not completely accurate. I ride on Seneca lake, just south of Dresden, most of the time.

  5. #5
    work hard..play harder! gruba's Avatar
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    I'll post some pics of at least the plug later, the ski is at the lake, and I won't be there again for a week and a half, bummer.

  6. #6
    work hard..play harder! gruba's Avatar
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    I ran out of time the last time I ran it, I was going to recheck all the settings, then replace the plug and see what happens. thanks

  7. #7
    Race, wreck, repeat delagem's Avatar
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    Quote Originally Posted by gruba View Post
    Compression is 123, 124, 119 in that order front to back, it is still oil injection and the speed is from the dreamometer that came on the ski, also had a buddy on a 08 seado run along side to check it, and his read 52.6, while mine read 53, still pretty good if not completely accurate. I ride on Seneca lake, just south of Dresden, most of the time.
    Compression sounds good, don't think you need to mess with your rings.

    My first guess is your oil pump has defaulted to full on. You'll want to read the service manual:

    http://pwcmanuals.shorturl.com/

    here's an excerpt from it....

    1995 - 1996 Models Except SLX780
    1995 - 1996 models feature a variable oil pump
    which is non-adjustable. The linkage rod between
    the carb rack and oil pump arm has a fixed length
    .

    Should the linkage rod be removed for any reason
    or left off, the oil pump will go to full open to prevent
    engine damage. See illustration at right.

    MAINTENANCE/TUNE UP
    Engine
    Oil Pump Adjustment - Polaris Engines
    NOTE:
    Adjust idle speed and throttle lever freeplay before
    performing oil pump adjustment.
    1. Inspect mark on oil pump lever and index mark on oil
    pump body. The marks should align with throttle
    released (idle speed). The lever should move
    immediately when the throttle is opened slightly.
    2. If marks are not aligned, loosen cable adjuster nuts
    and adjust until marks are aligned.

    3. Tighten nuts securely and recheck adjustment.

  8. #8
    Race, wreck, repeat delagem's Avatar
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    Quote Originally Posted by gruba View Post
    I ride on Seneca lake, just south of Dresden, most of the time.
    Dresden, eh? Is that creepy government barge still there, anchored offshore, deserted?

    There's one just like it on Cayuga too, only no US Government markings; been trying for years to figure out what those are all about.

  9. #9
    work hard..play harder! gruba's Avatar
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    It is there, they used to test nosecones for subs, sonar, in the deep water, it is about 800 ft deep there

  10. #10
    Race, wreck, repeat delagem's Avatar
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    [quote=delagem;1145192] Is that creepy government barge still there, anchored offshore, deserted? quote]

    Yeah, it's like something out of a Scooby Doo episode. Jinkeys! Zoiks!

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