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  1. #1

    96 sl-780 Missing on pto cylinder at high rpm

    Have a 96 that runs well, when you get up to a high rpm it starts to miss on one cylinder. I say that because when first out it runs ok but soon after maybe 2 minutes. Compression is 115-120-115, plugs are cheap 63 champions.. Going to replace them with good ngk's I think It is a spark issue, am going to trim the cables, install new plugs and re-run. Please correct me if I am wrong, but isnt this a total loss cdi. If so I should be able to move the wire to another cylinder to see if the wet plug moves right? By that, When I got it home the two front plugs look fine, but the rear was soaked. (better wet than ther latter). Anyhow, Anyone ever have a high rpms miss? Just rebuilt the carbs too..


  2. #2
    Hayabusa's Avatar
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    It is not a total loss system otherwise your battery would never charge. And yes, you can move any of the spark plug wires to any cylinder to see if your problem moves with the ignition system. I would get the right spark plugs in there first before doing anything else.

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Correct ^^^^^^^

    It's a "waste spark" system, not a "total loss". Total loss doesn't charge a battery, it simply runs until it dies. Used in race applications where the magnets of the flywheel places a minute drag, and added heat on the engine. So they eliminate the magnets/charging system.

  4. #4
    Got it. knew that just didnt think before i typed.. (imagine that). Anyone have any ideas on the problem at hand?

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Swap the plugs for NGK BPR8ES, cut about 1/4" of the plug wires back and resecure the plug boots.

    I had a coil failing when under load, but tested good on the ohm mter.

    Swap plug wires on the cyls and see if the problem follows the wire.

  6. #6
    Thanks, thats what I was going to do.. Any idea if a 95 sl750 coil would be the same?

  7. #7
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Quote Originally Posted by gvnitup View Post
    Thanks, thats what I was going to do.. Any idea if a 95 sl750 coil would be the same?

    They are the same.

  8. #8
    Trimmed the plug wire, added new ngk's.. Miss is gone, thanks guys.. 1 More happy polaris

  9. #9
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Great!!!!!

    Get out and ride......

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