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Thread: coupler for 780

  1. #1

    coupler for 780

    i recently installed a 780 engine in my 93 sl 750 hull . I used the large 780 coupler that was in the engine. when testing it under severe load i feel that it is slipping . i have a few 750 couplers should i just use one of those or order a new 780 coupler?


  2. #2
    Click avatar for tech links/info K447's Avatar
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    What coupler are you using? A solid metal coupler or a rubber bonded coupler?

    What makes you think the engine to driveshaft coupler is 'slipping'?

  3. #3
    its the rubber coupler. when slips it makes a loud noise. i have a couple of the smaller metal couplers i was just wondering if there was any differences. you can also physically feel it slipping then it'll lock up and work fine for a while.

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Ditch the rubber and install the all metal one.

    The rubber does fail, and it's heavier than the all metal.

    Those are what I run.

    Did you check your engine alignment after the new engine went in?

  5. #5
    No I have no alignment tool , but the driveshaft went in fairly easy so I assumed it was close.

  6. #6
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    I would generally recommend an alignment, but if you feel it went it OK, you might be fine.

    If you start to wipe out thru hull bushings and/or seals, might want to check that.

  7. #7
    do you know where to purchase a tool

  8. #8
    Moderator HiPeRcO's Avatar
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    Quote Originally Posted by Dragster5408 View Post
    do you know where to purchase a tool
    HERE: https://www.ebay.com/itm/20-MM-Steel...c/121655978407

    (This has the added benefit of being sized for a bushing to slip over it to align an MSX through hull bearing, should the need ever arise)

  9. #9
    ripcuda's Avatar
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    Both solid metal couplers and the larger rubber couplers are interchangeable. They each have a different sized protective plastic guard cover.

    Pull the pump and driveshaft. Inspect the splines on the driveshaft. If the driveshaft is slipping in the coupler you will have rounded splines. Do NOT stick your finger in the coupler. THat's a good way to take a metal shard splinter deep in your finger. Scope it out with a flashlight.

    I personally like the rubber couplers. I like jumping wakes on my 750's... and I've stripped 2 different solid metal couplers and driveshafts doing so. The rubber couplers take the driveline shock better and I've never stripped one (yet... knocks on wood).

    Cheers!

  10. #10
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    That's interesting that you've had the all metal fail and not one rubber.

    Mine has been the exact opposite result.

    Only had 1 rubber strip, but never an all metal coupler.

    Just curious though... Do you back off the throttle when you leave the water and get back on prior to re-entry?

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