07 Aquatrax lost compression in 1 cylinder
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  1. #1
    PWCToday Guru banjomaniac's Avatar
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    07 Aquatrax lost compression in 1 cylinder

    Looking at an 07 F12X with no compression in 1 cylinder. It only has 48 hours on it? Just some opinions from someone who has fixed similar problem.

    Banjomaniac

  2. #2
    Top Dog spatera's Avatar
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    Re: 07 Aquatrax lost compression in 1 cylinder

    I had that problem on my first Honda and it turned out to be the rings. The compression ring was stuck in the groove because they used the wrong octane and the motor was detonating beating the top of the piston but I was also getting a lot of crankcase pressure so I suspected that. You may want to pull the valve cover and check the problem cylinder for a dropped valve. You won't be able to see it because of the spring bucket but if there is no clearance between one the buckets and the camshaft it may be suspect. I've seen the valve keepers pop off and drop a valve. It won't drop too much before it hits the piston and bends the shaft or worse breaks it but I'd think you'd hear that. You can pull the cam to check it but it's a real hassle to set the chain adjuster without the little tool and you can't compress it without the tool or a little screwdriver.
    07 Honda F12X Saphire Blue
    MacBoost, Large intercooler, solas intake grate and impeller.

    03 Honda F12X Red

    Jim's Alpha Boost kit, H2O ECU Modulator, Large Intercooler, Solas intake grate and Impeller

    05 SeaDoo GTX 4-tec Supercharged

    Used to have:
    98 GP760, 97 GTX Sea Doo, 97 GP1200, 02 Honda F12X, 2-03 Honda F12X,

    Need to have:
    F15X

  3. #3
    PWCToday Guru banjomaniac's Avatar
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    Re: 07 Aquatrax lost compression in 1 cylinder

    Thanks for the reply Spatera, I'm going to probably pick this ski up Saturday and the guy told me it had 4 hours on it when he bought it he used it 2 Summers and it just suddenly lost power while riding in the bay he carried it to a mechanic who said it's probably a ring or valve it runs just has no power and no compression on that one cylinder. If it is a valve, can I fix it without pulling the motor?

  4. #4
    Top Dog spatera's Avatar
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    Re: 07 Aquatrax lost compression in 1 cylinder

    You can but it's so easy to just pull the motor and gives you access to everything since you have to pull the head anyway.
    07 Honda F12X Saphire Blue
    MacBoost, Large intercooler, solas intake grate and impeller.

    03 Honda F12X Red

    Jim's Alpha Boost kit, H2O ECU Modulator, Large Intercooler, Solas intake grate and Impeller

    05 SeaDoo GTX 4-tec Supercharged

    Used to have:
    98 GP760, 97 GTX Sea Doo, 97 GP1200, 02 Honda F12X, 2-03 Honda F12X,

    Need to have:
    F15X

  5. #5
    PWCToday Guru banjomaniac's Avatar
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    Re: 07 Aquatrax lost compression in 1 cylinder

    Gotcha, I pulled the motor on my current F12X but was hopping I could get out of doing it again. I'll check it out and let you know what I find.

  6. #6
    PWCToday Guru matt888's Avatar
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    Re: 07 Aquatrax lost compression in 1 cylinder

    Put a leak down tester on it and you will know exactly what is bad, if air comes out intake bad intake valve if exhaust then exhaust valve, if oil fill cap piston/rings.

    SOLD! HONDA AQUATRAX 2 SEATER
    1987 JS440 SUPERSTOCK
    1988 JS440 FREESTYLE
    1987 JS550 LIMITED
    SOLD AND MISSED VERY MUCH, 1994 WAVEBLASTER LIMITED
    WWW.HONDAOFWINTERHAVEN.COM
    1987 AM. WORLD CUP CHAMP

  7. #7
    PWCToday Guru banjomaniac's Avatar
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    Re: 07 Aquatrax lost compression in 1 cylinder

    I tried to make a leak down tester fitting from an old spark plug cause the tester I have doesn't have an adapter the right size. I'll try it when I get a chance and see if it works. I think the only way I can use it is with valve cover off.

  8. #8
    PWCToday Guru banjomaniac's Avatar
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    Re: 07 Aquatrax lost compression in 1 cylinder

    ???

  9. #9
    PWCToday Guru matt888's Avatar
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    Re: 07 Aquatrax lost compression in 1 cylinder

    Yea what he said

    SOLD! HONDA AQUATRAX 2 SEATER
    1987 JS440 SUPERSTOCK
    1988 JS440 FREESTYLE
    1987 JS550 LIMITED
    SOLD AND MISSED VERY MUCH, 1994 WAVEBLASTER LIMITED
    WWW.HONDAOFWINTERHAVEN.COM
    1987 AM. WORLD CUP CHAMP

  10. #10
    PWCToday Guru banjomaniac's Avatar
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    Re: 07 Aquatrax lost compression in 1 cylinder

    I couldn't go Saturday to get the ski, I think it's a deal for an 07 with 47 hours on it with a double trailer for $1500. If he still has it next weekend I'm going to try and go. I'm bummed out but that's the way it goes, I'm in coastal NC and he's in MD, 6 hour drive.

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