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  1. #1
    785xp's Avatar
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    1996 GTX Top end time?

    I purchased a 1996 GTX this summer. It has 150 hours on it and 135 psi compression. The engine has never been apart. I have been lucky enough not to have to do this job before. I know the compression should be 145 psi and plan to have my readings confirmed with another compression tester.

    Should I replace the pistons if it is 135 psi, or just the rings, bearings and a hone job?


  2. #2
    Neither. What is max RPM? 135 is fine if they are both the same. You should rebild carbs instead and replace gray fuel lines if you haven't already done so.

  3. #3
    96XPSS's Avatar
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    Mike, change the schrader core on the bleed of the compression gauge you have. These go bad and leak down. and give a lower than normal reading.

    After you confirm you are indeed low we'll go from there. No sense typing speculations until confirmed...

  4. #4
    785xp's Avatar
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    I finally had a chance to get out to the garage. Between the crappy weather and having kids, I haven't had a chance.

    Well the 135 psi compression was from the dealer's compression tester. I used my $15 version on my XP and got a reading of 160 psi on both front and rear. The GTX got a reading of 155 front and 150 rear, so I think I am good.

    They have been sitting for about 4 weeks and today I started them up in preparation for fogging. The GTX seems to smoke excessively. I assume it is running Seadoo synthetic. My XP running premix and Amsoil doesn't smoke near as much. This is running them before adding any fogging oil.

  5. #5

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    Our 96 GTX always smoked like a SOB when on the hose, strange cause the 97xp was less, both running XPS. I wouldn't worry about it. PSI sounds good.


    For shits & giggles make sure the oil pump cable is "OK" and hooked up correctly,etc. check the oil pump alignment mark also.

    TLR

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