Compression Questions

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  1. #1
    PWCToday Regular liame124's Avatar
    Join Date
    Jul 2018
    British Columbia

    Compression Questions

    Hey guys just picked up my first ski. It's running a little lean, and a little hot. Getting a sputter of water and some steam out of the pisser. Just picked up a cheapish compression gauge (50CAD). My rear piston readying 150psi, and the front reading only 125. I did the test with a cold engine, and with the other plug out. The ski starts fine, just doesn't like to idle once hot. The spark plugs seemed to have a little moisture on them. Any suggestions? any help is greatly appreciated it!

  2. #2 Is My Home Away From Home fastgtfairlane's Avatar
    Join Date
    Apr 2010

    Re: Compression Questions

    pull the head and have a look. get a new head gasket and just use the new oem gasket if the cylinder walls look ok. any major scoring above the exhaust ports will show compression loss
    Last edited by fastgtfairlane; 07-27-2018 at 08:37 PM.
    91 440; PJS Viper 7000, jetsport exhaust mani, factory full pipe, coffman waterbox,solas 17*, jetco worked 440 pump, ocean pro nozzles. shredmaster ocean rideplate and grate combo, wide tray, footholds, deep strake mod, driveshaft fill,650sx quick turn

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