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  1. #1
    Trent_sl750's Avatar
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    Sl 750 still bogging!

    Update on ski, so far i have:


    rebuilt carbs
    Replaced all fuel lines
    replaced sending unit
    triple outlet fuel pump
    reed spacers
    sl780 flame arrestor


    Tested motor, its air tight no leaks
    good compression
    good piston wash
    chocolate brown plugs


    THE PROBLEM.


    still fighting with the bogging issue iv had the whole time. Doesnt do it every single time i get on it, sometimes it will go fine then others it wont. Also if i cruise at around 20ish it seems to miss and when i give it gas it hesitates.


    Im completly stumped on my next move, any help would be greatly appreciated


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Have you tested it strapped down to the trailer at the launch ramp with the seat off?

    Just back it down far enough to submerge the jet pump intake. Make sure no loose rocks or debris underneath. Rear of hull must be strapped down and the front must secured against bow rise when you apply throttle.

    You might have a small water spray into the air intake or perhaps an exhaust leak. Some problems causes are only visible under power in the water.

    Another test is to ride with the seat off and see if the symptoms change.

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Did you trim back the spark plug wires 1/4" and screw the plug caps on snugly?

  4. #4
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    Did you compensate for the freer breathing flame arrestor in your carb settings. Going to a less restricted flame arrestor changes things.

  5. #5
    Trent_sl750's Avatar
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    Yes i compensating for the flame arrestor, its also up jetted.

    i have trimmed the plug wires also.

    I will check the others things on trailer that you mentioned.

    Where would the water spray be coming from in the intake i need to look for?

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Trent_sl750 View Post
    ...

    Where would the water spray be coming from in the intake i need to look for?
    Sometimes a hose clamp is not right or a water hose has a tiny hole or tear. Under pressure the water can spray from just about anywhere in the hull all the way to the engine. Whether it causes a problem depends on where the water ends up going.

    ByranP had a tiny spray coming from the water bar area that was spraying across the top of the engine and hitting the flame arrestor, thereby feeding water mist into the engine air intake. But only detectable at speed with the seat off. At idle and testing on the ramp it was not noticeable.

  7. #7
    Trent_sl750's Avatar
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    Ok i will check that!

    also if my plugs are a good color and i have good piston wash should i keep trying to adjust it to fix the bog or look for things like you said first?

  8. #8
    BlueFishCrisis's Avatar
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    If you have choke, you can try adding choke when accelerating. If the problem goes away, it needs more fuel. If it gets worse, you are running too rich.

    Check for leaks also. My exhaust pipe to exhaust manifold was leaking under power spraying water and causing issues..

  9. #9
    Trent_sl750's Avatar
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    Iv been reading about the tank ventilation, and sometimes when i open the gas cap its under alot of pressure, is it supposed to or could this be something of my problem?

  10. #10
    BlueFishCrisis's Avatar
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    What's alot of pressure? The tank should have two vents on it. One that allows air in as fuel is used, and one allows air out, as vapor pressure builds. The valve that lets air out is set to open at about 2 psi, so there should be pressure, but not a bunch. Check your vents.... You can temporarily test the issue by removing the check valves. Not recommended to run like this though....

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