Thread: 1996 GTX Top end time?
09-29-2009, 03:37 PM #1
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?
09-29-2009, 05:20 PM #2
- Join Date
- Sep 2008
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.
09-29-2009, 07:21 PM #3
- Join Date
- Feb 2006
- Warner Robins, GA Home of the 2007 All-Star Little League World Champions!
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...
10-18-2009, 10:56 AM #4
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.
10-18-2009, 05:44 PM #5
- Join Date
- Jul 2005
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.
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