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  1. #1

    1996 SLT 780... Rebuild..

    Hello everybody. My name is Chris. I just got a 1996 SLT 780 thrown in my driveway for free. It is in pretty good shape for as old as it is. The body is faded and has some whiskey dings but nothing major. The engine is pretty dang clean if I do say so.
    I'm thinking that I am going to have about a 500 budget to get this ski back in the water running strong. I have 2 late model sea doo's. (07 RXT/2010 RXTX) that are supercharged so the SLT wont be a speed monster but should be fun.
    I will get some pics of the engine bay later tonight.
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  2. #2
    Day 1

    I replaced the battery with a new one to see if I could get this thing to crank. I know that it has been sitting for about a year and was told the last time it was out it ran but was sluggish.

    Threw the new battery in and it did turn over but did not start. I am going to remove old fuel and spark plugs. Plugs looked good but will still replace them.

    Quick question. The oil in the oil tank looked a little grey/blue. Is that the color of the 2 stroke oil?

    From what I have been reading. It is a good idea to replace oil lines and fuel lines. I plan on doing that. Also rebuild the triple carbs. Does anybody have a link to the carb rebuild kit I need. Can I use a aftermarket one from ebay?/
    Also I don't think the MFD works. I read about a .25 amp fuse . Should I just start there?

    I wanted to remove some stickers to see if I could buff the gelcoat. Starboard side front removed and 20 mins with the buffer I think it came out pretty good

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  3. #3
    Sooo...how much for the 780? stimpsonjcat's Avatar
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    I have 4 96 SLTs, I love these things!
    3 run.
    first thing is yank the plugs and get a single LED flex flashlight and get a good look at the piston heads. You want to see some 1" or so clean spots around the edges and no cratering or pitting anywhere.
    After that, go thru 447's links.
    I would do all fuel and oil lines in tygon. Drain and clean all tanks. Get carb rebuild kits from www.watcon.com, rebuild or replace the driveshaft coupling (watcon sells a VERY nice upgrade).
    Rebuild the pump...no really...I have bought 4 of these and every pump needed new bearings/seals.

    It'll do 50mph easy when you get it right, and the ride is nice vs smaller skis.

  4. #4
    BlueFishCrisis's Avatar
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    Quote Originally Posted by stimpsonjcat View Post
    I have 4 96 SLTs, I love these things!
    3 run.
    first thing is yank the plugs and get a single LED flex flashlight and get a good look at the piston heads. You want to see some 1" or so clean spots around the edges and no cratering or pitting anywhere.
    After that, go thru 447's links.
    I would do all fuel and oil lines in tygon. Drain and clean all tanks. Get carb rebuild kits from www.watcon.com, rebuild or replace the driveshaft coupling (watcon sells a VERY nice upgrade).
    Rebuild the pump...no really...I have bought 4 of these and every pump needed new bearings/seals.

    It'll do 50mph easy when you get it right, and the ride is nice vs smaller skis.
    All good points. Tygon is good stuff, and therefore expensive. You can also use a high quality 1/4" fuel line to replace the fuel lines, but that is your call.......

  5. #5
    Sooo...how much for the 780? stimpsonjcat's Avatar
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    Actually, I use hard fuel line for tank to shutoff and from there to the carbs, and for the crankcase connection to the fuel pump.

    I use tygon between the carbs and for the oil lines.

  6. #6
    Here are a couple pics of the engine . Looks pretty clean.
    I do have a question about the fuel line everybody tells me to replace. I took a couple pics of the 2 lines coming from the on/off knob. It looks to be Gates fuel line. Is this the standard stuff and not the Tempo? Maybe somebody already changed the lines. Where do I look to make sure I don't have the tempo stuff?

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  7. #7
    ripcuda's Avatar
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    Sweet deal on your ski! It buffs up pretty nice... and your engine does look very clean!

    2-stroke oil is usually blue-ish or green-ish with a unique, but not bad smell. I'd save the oil you drain from the oil tank... as long as it's not contaminated, it should be fine to use. Or at least use it in your weedwacker or something.

    Those fuel lines look replaced. Gates is decent hose. The dreaded Tempo hoses are grey-ish in color I believe. You should pull off all fuel hoses and inspect at a minimum. If they are clean inside and still pliable (not dry and hard) and not chewed up at the ends from a hose gear clamp (trim ends if you have enough slack)... I'd reuse them.

    I too recommend a carb rebuild, new seals in the thru-hull seal carrier and at a minimum, pulling the jetpump out and popping the cone off and inspecting the impeller shaft, bearings and seals (rebuild if necessary).

    Cheers!

  8. #8
    I will be posting pics of everything I take apart. I don't know anything about this ski . So look forward to all the expertise.

  9. #9
    Got 4 bolts off the bottom of the carb. 2 nuts stripped and rounded. Any ideas

  10. #10
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    Are the 2 stripped nuts on the same carb? If they are you may be able to separate the 2 loose carbs from the third one and then get access to remove the intake manifold with the one carb still attached. Then you could work on it on the bench instead of in the ski.

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