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  1. #1
    Driver4r's Avatar
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    Second life slx780

    Since my original post was about the ski not running, I figured I would start a new topic about its progress.

    Fast forward from then till now (4 months).

    I pulled the carbs off and life and work got in my way for a bit, finally got them back together and on, but befor i take it out again, I was going to install my new water seal/bearing. Upon pulling apart my pump, I found LOTS of neglect.
    Last time she was out she would do 40ish mph (dash speedo)..

    I'm honestly surprised it went that fast after how bad this looks.

    Now I need to collect a new shaft/impellor/wear ring/housing...

    Anyways, here's the pictures. (Pictures are of the damaged 780 pump)

    For the time being untill winter, I stole the pump setup out of my 1050. We will see how it does haha... it will probly be a pooch with the 17/22 prop.Click image for larger version. 

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  2. #2

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    What causes that kind of damage? Running in sand / shallow water?

  3. #3
    Driver4r's Avatar
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    Quote Originally Posted by froeman View Post
    What causes that kind of damage? Running in sand / shallow water?
    The lakes around here have alot of lime covered beds, and around the beaches and boat ramps it gets pretty shallow, and is just covered in rocks/lime stone. I'm guessing it's just sucked up so much over time.

  4. #4
    Driver4r's Avatar
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    Learned something the hard way today, the wedge on my 1050 is different than my 780... the 780 has more degrees to it, meaning it's thicker... Well I tried assembling the pump with the 1050 wedge and the 780 nozzle, and it cracked the water feed off of the nozzle because the tube bottomed out in the nozzed befor the nozzle seated....

    Going to adhesive it together temporarily, and get another on it's way....

    The only way to learn is to experience issues

  5. #5
    Driver4r's Avatar
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    OopsClick image for larger version. 

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  6. #6
    Click avatar for tech links/info K447's Avatar
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    There are different lengths of water tube (the tube that runs forward from your cracked nozzle to the pump base at the hull transom).

    There was one or two model years (780 only?) that had a special 'twisted' pump wedge and angled tail cone on the stator. The wedge was thicker that the typical wedge, and had an angle to one side as well as upwards. The water tube was correspondingly longer too.

    If you change to a six vane stainless steel pump stator it is common to also retire the twisted wedge and tail cone. Check/change the water tube when changing pump wedges.

    At the front lip of the water tube there may be one or more o-rings. These o-rings are not for water sealing, they are spacers to hold the water tube just far enough back to fully seat inside the pump nozzle hollow. Sometimes the number of o-rings needs to be changed when changing the pump wedge.

    Sometimes there are zero o-rings.

    The actual seal for the water tube is a square shouldered washer trapped between the pump base and the hull transom. There is just one, and it is common for it to not be 100% watertight. It is not accessible without removing the pump base from the hull. Which is why you often see sealant smeared all around the water tube, either around the tube just inside the hull or outside at the pump base.

  7. #7
    Driver4r's Avatar
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    Finally took her to the lake today, after tuning on it for 2 hours, we got up to 48mph with the 17/22 impeller, which I don't feel is too bad. Sooo much better than she ran befor the carb rebuild.

    And here is the difference in the shims that he was talking about.Click image for larger version. 

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  8. #8
    Driver4r's Avatar
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    Any recommendations on a better impeller when I go to order one? I'm reading an old post and Watcon talks about how a 785 will come with a 12/17, but instead of a 13/18, he will go to a 10/16 for more takeoff/top end/ and more mph.

    Yesterday she was hitting about 48@5600. Any ideas on a blade? And I live@1250 elevation.

  9. #9
    Driver4r's Avatar
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    Took it out again tonight, the water was pure glass. That had changed within minutes.

    Towards the end befor I left I was messing with the trim while WOT, rather than just shooting tails or going flat. And after it would plane, I would tweak the trim and I managed to get 52.3 on the guage @5850.

    When does the limiter kick in on these? Is there more performance to be had? It's a dog on the bottom. Havnt tried pulling a tube yet.

  10. #10
    RLACEMAN's Avatar
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    RPM limiter on a 780 kicks in around 6700-6800. a 13/18 Skat-Trak is a good choice for the 780's Originally the SLX (95) came with a 4 blade impeller, this was a very good one. If you are interested I have a nearly new Solas 12/18 that I had impros repitch to a 13.5/19.5 I used briefly on my SLT 780 conversion, it gave a very impressive hole shot & was able to push a 3 seater to 52mph on GPS. I wouldn't use that 17/22 too long you are lugging the engine & could damage it, a SLX should be running about 6500rpm's

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