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  1. #1

    650 case with 780 jugs will fit?

    Hi, i want to know if 780 cyl will fit on a 92' sl 650 case and if the 650 cdi will give me more rpm's or i have to go with the 780 cdi. thanks


  2. #2
    Moderator beerdart's Avatar
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    Yes the 780 cylinders will work. Yes the CDI will work. The exhaust manifold for the 780 is different.

    Welcome to the Hulk...

  3. #3
    Ok thanks, i have the manifold, but which cdi will give more rpm's im looking for top speed

  4. #4
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    For the ability to get more rpm's, you need a 785 pro cdi my friend.

    Almost forgot, you will also need the flywheel and a stator from a 750 or better(fuji) to make the pro cdi work.
    The difference between the 650 - 780 you will hardly even notice, if at all.

  5. #5
    Whats the diference of the 3. 650 ,780 and pro

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by geobecky3 View Post
    ...fit on a 92' SL 650 case and if the 650 cdi will give me more rpm's...
    Welcome to the Hulk!

    If you are starting with a 1992 SL650 watercraft, that is not a good platform for speed. The jet pump is probably the stock non-modular 146mm pump, which is not an efficient jet pump design. You could upgrade it to a modular 148mm Polaris jet pump (used from 1994 onwards), but that adds cost to your project.

    Anytime you boost engine power, you may need to change impellers to keep engine RPM in the correct range. I don't know if there is a 146mm impeller that can handle 780 power levels.

    If you are looking for speed, you may be better off to get your SL650 running in stock form, sell it, and buy a bigger engined, more modern model. Often you can find deals on newer used PWC, especially if they are not running 100%.

    BTW, click here for links to Polaris Service manuals, parts look-up, and other useful info.

  7. #7
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Check out the manual to see the differences. Most Polaris manuals can be found here.

  8. #8
    No i have a 780 slt hull the crank blew a rod, so im trying to put a case with crank the i have in good condition with the780 jugs .

  9. #9
    where i can get a 785 cdi, plus i need 1 780 jug to buy, and whats the diference on the wiseco pistons and the SBT ones.Thanks

  10. #10
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Quote Originally Posted by geobecky3 View Post
    where i can get a 785 cdi, plus i need 1 780 jug to buy, and whats the diference on the wiseco pistons and the SBT ones.Thanks
    The way I understand the diffences are, the wiesco's ( some aka them a siezeco's) require more bore clearence than others as they are forged and expand more than cast pistons. You won't find many people around here that will recommend sbt anything. I'd recommend wsm pistons.

    Some around here may have a pro cdi, but ebay is where I found mine.

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