SBT Jetski Engines, Parts & Accessories

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  1. #1
    Joined
    May 2003
    From
    payson arizona
    Posts
    14

    Post

    the ski wasnt running well loading up and flooding out so i had the carbs rebuilt,after installing the carbs it wont start just cranks, sometimes it tries but never does...is this common?> could the carbs need to be set?and how ive located the low speed screw but cant find the high help!!!

  2. #2
    Joined
    May 2003
    From
    payson arizona
    Posts
    14

    Post

    i seem to have plenty of spark and ive even gone as far as adding fuel in the spark plug holes but still nothing it ran before the carb rebuild but not very well.......

  3. #3
    Joined
    May 2003
    From
    payson arizona
    Posts
    14

    Unhappy

    heres the latest,i bought a new compression gauge and going from front to back 62,63,60 how would all three be testing so low is it rings or is there something im not getting here?help please.....

  4. #4
    Joined
    Mar 2003
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    SBT
    Posts
    21,545

    Post

    You may be low, but that gauge is way off, it would not run with those readings. Get a good gauge and try again.
    SBT Tech Support is here to help with your problems.
    We try to answer each question quickly and accurately.
    Please do not use Private Messaging for Tech Support, use the forums.

  5. #5
    Joined
    May 2003
    From
    payson arizona
    Posts
    14

    Post

    thats what i thought so i got a new gauge and it came out the same then i took both gauges and tried them on my 97 spx and they both read 128-130 whats up ? the rear carb was flooding out and filling the cylinder with fuel so i got them rebuilt ,could i have was out all three cylinders buy having one filling up ,how do i remove all that fuel?or should i not stress it..

  6. #6
    Joined
    May 2003
    From
    payson arizona
    Posts
    14

    Post

    o.k. i added alittle oil to the cylinders and my comression increased by 30 and then dropped after cranking a couple times so im thinking rings.so i pull the cylinders and the rings dont look that bad but i can see areas on the cylinders that apear to be shinyer like not uniform,and then i notice my crank case is full of fuel and oil, how much juice should be down there and should it be just oil or is fuel a common occerance? i think the fuel is from the flooding carb i rebuilt .......(drain plug)?

  7. #7
    Joined
    Mar 2003
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    SBT
    Posts
    21,545

    Post

    Um, gauges and hoses are supposed to have schrader check valves in them - if you see the pressure actually drop, the gauge is shot. Even if adding oil produced a higher reading, it should never go down from that higher reading.
    SBT Tech Support is here to help with your problems.
    We try to answer each question quickly and accurately.
    Please do not use Private Messaging for Tech Support, use the forums.

  8. #8
    Joined
    May 2003
    From
    payson arizona
    Posts
    14

    Post

    um,the gauge wouldnt drop the compression would drop after rechecking, like (add oil, check 90...remove gauge add plugs try to start ,recheck with out adding oil..60psi add oil again recheck 90psi remove gauge crank motor to remove eccess oil recheck.. 60psi )the gauge itself never dropped while sitting

  9. #9
    Joined
    Jul 2002
    From
    Olathe, KS
    Posts
    157

    Post

    When you added fuel to the cylinders. It should have fired up, even if very breifly.

    The fuel in the bottom of your crankcase doesn't sound right to me, but I'm fairly new to this game myself. Maybe if there is a ton of liquid, it would provide extra resistance for the crank and make it harder to turn over???
    Perhaps you could undo your oil pump, let the liquids drain, and then re-install your oil pump. It should just be two bolts. So, it shouldn't take but 5 minutes to try.

    Other than that, it'll take a few minutes to pull fuel back through your carbs and other lines.

    Compression sounds really low, but if it ran before...
    Joe Kissell<br />-1995 Tigershark 900<br />-1986 Kawasaki 650 X2

  10. #10
    Joined
    Jun 2002
    From
    Charlotte NC
    Posts
    1,868

    Post

    It might have been on its last leag and now after it cooled down it has lowwer compression than when it was running up to temp. sinceyou are not sure of your gauge why not take it to someone who is?
    Providing mobile JetSki service to the Charlotte / Lake Wylie area.

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