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  1. #1
    Sooo...how much for the 780? stimpsonjcat's Avatar
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    OK...so it is not an SLT780...it has the same engine in it...plus some goodies!

    Went and looked at and then bought a 95 780SLX.

    It has the fancy aftermarket carbs on it. Guy said he would take $200 for it without the carbs, $300 with them, but when I got there they were still on it.

    guy "So, you want those?"
    me "No."
    ...staring...
    guy "$225?"
    me "Done."

    Click image for larger version. 

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    Pic of damaged piston...not sure what got loose in there. The dents are not round. The rings look fine. There is no play in the wrist bearing or crank. Ideas?
    Click image for larger version. 

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    Pump is all there and got two impellers, both stock IIR the numbers correctly. The MFD is smashticated, but I have spares.

    The hull is a bit beat up. Can I rework any of this with the ski upright on a trailer? What would I use for repair?

    Oh, the guy has a 750, will have a matching one soon, and has a domestic CDI upgrade kit, iif anyone wants his contact information let me know.


  2. #2
    burtonrider10022's Avatar
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    Arent those dimples in the piston from melting? Also, for the hull, I think in the "painting a jetski" sticky around here somewhere there is a bunch of discussion about hull repair. I wanna say I read it's CMC? or SMC? not plain fiberglass and requires a different method.

    Congrats on the pick-up though. any big plans for the "performance" ski over your towboats?

  3. #3

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    pull the engine.looks like the crank bearing could be coming apart

  4. #4
    Sooo...how much for the 780? stimpsonjcat's Avatar
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    Is there any way to test/check for crank bearing failure without yanking it?

    I guess it is mostly out already sooo...

  5. #5
    burtonrider10022's Avatar
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    Funny. After reading this last night I went through the rest of the new posts and saw this:

    Quote Originally Posted by K447 View Post
    That sounds like something is very loose inside the engine - not normal sounding to me

    I would suspect one of the connecting rod bearings or crank shaft bearings has failed.

    My suggestion is to remove the cylinder heads and look for any signs of damage. If a bearing has come apart often the small metal debris goes into the combustion chamber where it dings up the piston top.

    That small plastic screen in the jet pump nozzle is not expensive. The small mesh holes are angled to direct water flow. Order one when you order the other parts I suspect you are going to be needing...

    So yeah, looks like rr44red makes a good point.

  6. #6
    RLACEMAN's Avatar
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    I have seen detonation from low grade fuel cause this type of damage, notice its only in the squish band area, but more likely is that pieces of crank bearing are causing it, since you have alot of 780's I would take it completely apart to check crankshaft.

  7. #7
    Sooo...how much for the 780? stimpsonjcat's Avatar
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    Right!

    Rip it all apart!

    I am still not clear on how to test/check the crank/bearings when I get it all apart? I can check crank timing easily enough by chucking it up in the lathe. Is it obvious when a bearing is gone?

  8. #8
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    If bearings turn freely with no slop and no noise, they are ok. They will feel gritty and not turn smooth if they are bad. You will know right away when you turn them. But you can't really check them without removing the crank from the engine.

  9. #9
    Sooo...how much for the 780? stimpsonjcat's Avatar
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    The crank appears to turn freely even in the engine, but I will take everything out and go through it.

    It is winter, and I haven't done a complete teardown/rebuild yet...it must be fate.

  10. #10
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    The crank on my X45 turned nice and smooth in the case. Pulled it out and 6 of the 8 bearings were bad.

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