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  1. #1

    got a 96 slt780 I dont think the middle cylinder is firing

    Basically it was running fine, but then it wouldnt run WOT. Got home and noticed the exhaust where it bolts to the water exhaust was loose (4bolts). There was alot of water inside the hull from this. One of the plugs was bad I think b/c of the water. I replaced the plugs but it doesnt want to run. Using an infrared gun it seems the middle cyclinder isnt firing well. All plugs are getting spark.

    I NEED HELP. New to jet skis, my father n law let me borrow these and im having touble with the slt780.

    Thanks,
    chazman05


  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Do you mean the 4 large bolts mounting the exhaust pipe to the exhaust manifold was loose?

    If so, you may have to look and see if any water got inside the engine.

    And welcome to the Hulk.

  3. #3
    Quote Originally Posted by xlint89 View Post
    Do you mean the 4 large bolts mounting the exhaust pipe to the exhaust manifold was loose?

    If so, you may have to look and see if any water got inside the engine.

    And welcome to the Hulk.
    Thanks, and yes somehow all 4 bolts on top were very Loose. I took plugs out and turned engine over no water. How am I suppose to see if water got inside engine?

    Thanks for welcome.

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    That would pretty much do it. (plugs out and cranked over)

    If you have spark, then do a compression test and see what you come up with across all 3.

    Hold throttle open when testing.

  5. #5
    Quote Originally Posted by xlint89 View Post
    That would pretty much do it. (plugs out and cranked over)

    If you have spark, then do a compression test and see what you come up with across all 3.

    Hold throttle open when testing.
    Will this thing do the trick? http://www.autozone.com/autozone/acc...er=487835_0_0_

  6. #6
    RLACEMAN's Avatar
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    If you have spark, good compression & fuel & its still no firing, you may have a bad reed valve.

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by chazman05 View Post
    That compression tester looks fine.

    Actron/2 1/2 in. quick release compression tester kit
    Part Number: CP7827


  8. #8

    no compression on PTO cylinder

    Quote Originally Posted by RLACEMAN View Post
    If you have spark, good compression & fuel & its still no firing, you may have a bad reed valve.
    I tested compression and had about 95 on the front MAG, 110 on center and 30 on PTO rear cylinder.

    Whats next?

    Father N law is offering to buy a new engine for it, if we go that route where do yall recommend buying one? I did a quick search on ebay and saw some for $800.00 Is that a good price?

  9. #9
    RLACEMAN's Avatar
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    I don't know if its worth spending that much on a 96, unless the hull is in near mint condition, but either way go with a rebuilt that has the crank done too, I have known a couple people that used a SBT with good luck, some on this site don't care for them though, I bought a 780 top end exhange from them & had good luck.

  10. #10
    Click avatar for tech links/info, donation request K447's Avatar
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    The question becomes; Is it better to part out the existing machine for some money and put that plus the $800 towards a newer model with a running engine. Or at least one with a less expensive problem.

    If you put a rebuilt engine in that 1996 SLT, assuming nothing else is in need of repair or replacement, you will have a running 1996 model watercraft. If you like the current machine enough then go ahead.

    If you would prefer something newer or different then now is the time to decide which way you want to go.

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