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  1. #1
    PWCToday.com Is My Home Away From Home kcr357's Avatar
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    What causes low cmpression

    Taking apart a 185 motor from an 03 gtx, it has 150/100/50 psi front to back. Cylinders and pistons are visually perfect. Head/valves are as well, and there's no light visible through the valves. Haven't had a chance to do any other tests yet.
    Is there a common cause for this? Anything other tests I can run? These new fangled engines are a pita....There's a never ending supply of oil constantly leaking out everywhere.
    How many gerbils could a gerbil jammer jam if a gerbil jammer could jam gerbils?


    "You build cheater motor's & still get smoked !!!!"
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  2. #2
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: What causes low cmpression

    On a 185 i would suspect a head gasket. Was there no coolant in the oil?
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
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  3. #3
    Top Dog Benflynn's Avatar
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    Re: What causes low cmpression

    Time for a leak down test, get a plug adapter, fill that ****er up with air and see where it going

  4. #4
    Top Dog Benflynn's Avatar
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    Re: What causes low cmpression

    Unless it's diss assembled, I'd be looking at cams and bent valves, if it was the gasket u would be able to see it if u look really careful at the marks left on block and cyl head, at least if it was passing water

  5. #5
    PWCToday.com Is My Home Away From Home kcr357's Avatar
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    Re: What causes low cmpression

    No oil in the water, no water in the oil.
    It's disassembled unfortunately.
    Ill check again for signs of a head gask leak, but ive looked a coupk e times already and s aw nothing.
    REALLY hoped id find some gummef up rings, but no go.
    How many gerbils could a gerbil jammer jam if a gerbil jammer could jam gerbils?


    "You build cheater motor's & still get smoked !!!!"
    "Its not your fault. You just don't understand what you're talking about. "

  6. #6
    PWCToday.com Is My Home Away From Home kcr357's Avatar
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    Re: What causes low cmpression

    It's definitely the valves leaking. Any recommendations on where to send the head to get rebuilt?
    How many gerbils could a gerbil jammer jam if a gerbil jammer could jam gerbils?


    "You build cheater motor's & still get smoked !!!!"
    "Its not your fault. You just don't understand what you're talking about. "

  7. #7
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: What causes low cmpression

    How are the seats and guides? Usually they are good. I disassemble and clean everything then lap the valves back in and install new seals....done!
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

  8. #8
    Top Dog Benflynn's Avatar
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    Re: What causes low cmpression

    I pour acetone or even carb cleaner in combustion chamber and ot will leak through bad valves

  9. #9
    Top Dog Benflynn's Avatar
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    Re: What causes low cmpression

    I pay 8$ a valve at local ms, but u might have a problem with some having small enough stones or what ever

  10. #10
    PWCToday.com Is My Home Away From Home kcr357's Avatar
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    Re: What causes low cmpression

    Quote Originally Posted by Benflynn View Post
    I pour acetone or even carb cleaner in combustion chamber and ot will leak through bad valves
    Thats exactly what i did but with diesel fuel.

    Not sure on thr cond. of the guides and seats yet.

    Thanks everyone for the help so far
    How many gerbils could a gerbil jammer jam if a gerbil jammer could jam gerbils?


    "You build cheater motor's & still get smoked !!!!"
    "Its not your fault. You just don't understand what you're talking about. "

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