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  1. #1

    compression craziness / busted xp 800

    Two weeks ago I bought a used 1995 XP 800. Compression tested good at 150/150 and the ski ran great. Ran 4 tanks of gas through the machine over two weekends. Near the end of the last tank while running around at a very slow pace (with scared wife on back) the ski all of a sudden bogged out and stalled.

    After that all it will do is bog out and slowly move around with nasty oily gas water spitting out of the exhaust. Spark plugs are now black and a compression test now shows 140/165.

    Is this possible? How does the compression go UP? Any ideas on what type of malfunction this could be?

    Thanks in advance,

    Sean


  2. #2
    flyin' the friendly skies airbornexp's Avatar
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    could just be your gauge...from the looks of it you may have leaned out a piston. pull the head and inspect for damage

    oh and welcome to GH!

  3. #3
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    the gas oil coming out of the exhaust means the needle & seat are stuck open, flooding the cylinder, thus causing it to get wet and give you a higher compression reading.

    does it still have the grey fuel lines?
    if so you need to replace them, rebuild the carbs and clean your fuel selector valve.

    I bet the 140 cylinder is the PTO side. This one will always run hotter, due to less fuel being delivered to that cylinder.

  4. #4
    way2fast4U's Avatar
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    Be sure and check compression with throttle wide open also check rave valves for bellows blown off. Make sure valve moves up and down freely as they will get stuck and cause ski to bog and have no acceleration. Fuel line has been a problem but i would think by now it has been replaced.

  5. #5
    flyin' the friendly skies airbornexp's Avatar
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    Quote Originally Posted by way2fast4U View Post
    Fuel line has been a problem but i would think by now it has been replaced.
    you'd be suprised at how many people that are new here have not changed them out...and thats just the people that have joined GH.

  6. #6
    thanks for the welcome, and the replies...

    i have a mechanic looking at the ski now, waiting to see what he says

    the rear rave valve has black carbon, oil, and possible gas oozing out. i believe the gas lines ARE a dark grey.

    this is my first jet ski so i really appreciate the help

  7. #7
    flyin' the friendly skies airbornexp's Avatar
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    Quote Originally Posted by evanssd1 View Post
    thanks for the welcome, and the replies...

    i have a mechanic looking at the ski now, waiting to see what he says

    the rear rave valve has black carbon, oil, and possible gas oozing out. i believe the gas lines ARE a dark grey.

    this is my first jet ski so i really appreciate the help
    yep those are the gray tempo lines...notorious for killing motors. they deteriorate and clog the carb screens. sounds like this ski was pretty neglected. what kind of shape is it in? got pictures?

  8. #8
    I will take some photos when I get the ski back from my local mechanic. I am curious to find out what his estimate is... the ski looks great for its age. super clean engine compartment and the exterior has zero fade. the gear hatch cover has a little fade, would like to figure out how to repaint this black one day.

  9. #9
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    for a job i will usually charge $285 for a complete fuel system replace & 2 carbs rebuild.
    rave valves clean/rebuild $35 a piece

    I hope you dont get raped. and he does the job well.

  10. #10
    Joe Stang's Avatar
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    Quote Originally Posted by way2fast4U View Post
    Fuel line has been a problem but i would think by now it has been replaced.
    For every ski that has new lines, there are 5 skis that have stock lines. I've changed out at least 20 skis lines this year. I get $275. That includes lines,clamps, carb cleanings, fuel selecter cleaning with new nut and new carb gaskets. You'd be suprised when changing fuel lines how dirty peoples carbs are. I've saved every ski I've done from blowing up this year. Then I'll get a call from the customer telling Me their ski has never run so good.

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