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  1. #1

    Join Date
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    to Ring or not to ring .....slx 780

    Hi,
    We're tearing into the 1996 slx. I have two of them. also a 94 sl780 which has a bad motor. We got one of the 96 slx to fire and run. We did a compression test and came up with 85-90 psi each cylinder. Is it reasonable to think about just re-ringing the piston if the cylinder is o.k. Also we couldn't get the unit to turn over unless we grounded the electroics case to ground. Is this just a sign of lousy grounds or is it symtematic of something else wrong.
    We're trying to save money. We'd like to get a good running machine for not much money. So if we can just install some good cylinders and pistons that would be great.


  2. #2

    Join Date
    Oct 2006
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    Beaver Falls, PA
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    I'm not sure who made the 94 780 never saw one of these till 1995. maybe beerdart knows more on the model year. he is a master moderator. Dart please tell this guy how he can fix all his issues here.......

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    If you don't have any damage to the cyls, I'd rehone and re-ring the cyls.
    That would be the cheapest proper way to do it.

    If you need to ground the elec box externally, something is amiss. The box should be grounded to the engine via the elec stator. (This seems to be problem on a few skis as the ground wire will melt inside the harness.)

    Check to make sure the battery ground wire is clean and tight on the engine mounting plate at the rear. Also make sure the connections are clean and tight inside the elec box itself. Pay attention to the screws also. They are grounding connections for some components.

    Oh, and make sure you get the correct model and year when asking Q's. There were no 780's until 95, if it is a 94 it's either a 650 or 750.

  4. #4

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    good job xlint 89 you have come a long way since your first post.

  5. #5
    Moderator beerdart's Avatar
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    Quote Originally Posted by 4stroker View Post
    good job xlint 89 you have come a long way since your first post.

    Hail to the chief

  6. #6
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by 4stroker View Post
    good job xlint 89 you have come a long way since your first post.
    I get by with alot of help from my GH friends, ooooooh, I get by with alot of help from my GH friends....

  7. #7

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    Nov 2008
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    Stuart ,Fl
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    My bad

    Sorry about the 94 95 mixup. Its a 96 sl780.
    Are the parts pretty much interchangable except for the pump. Can i use a stator from the sl and put it in the slx? Tearing this stuff apart and figuring out what's what is pretty cool.
    I'll try to be more accurate in the future.....(kinda ruff on a new guy,,,,,hurt my feelings) NOT!
    rich

  8. #8

    Join Date
    Oct 2006
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    Beaver Falls, PA
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    yes the parts are the same for 780 motors the same with the stator. There was a guy in your area that was working on Polaris units. Might want to check the phone book he might have a few parts laying around you could score and help ya tune it. The owners name was Bart, check in the area he's a local name at the shops there.

  9. #9
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    You can use a 750 elec stator in a 780 or vice versa. 650 stators use an analog signal instead of digital, however they do woirk. Mine burnt out though, I think because of that difference.

    What pump are you referring to? Jet or fuel

    The jet pumps are all interchangeable from 94 and newer. They are modular, so you can swap/replace components from many diff skis.

  10. #10

    Join Date
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    Stuart ,Fl
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    I was thinking that the sl jet pump was shorter than the slx. I also have gotten the message that i need to be using the later multi port fuel pump so as to not create a lean condition.
    Thanks for the help and merry xmas

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