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  1. #11
    PWCToday.com Is My Home Away From Home kcr357's Avatar
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    Re: What causes low cmpression

    Quote Originally Posted by Myself View Post
    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!
    Its the seats, dammit.
    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. "

  2. #12
    PWCToday.com Is My Home Away From Home
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    Re: What causes low cmpression

    Gotta love those 4 strokes...
    Riding mostly Lake Austin

    1984 JS440
    1989 650sx
    1991 X2
    1992 750sx
    1995 900zxi (qty 2)
    1995 X2

    Quote Originally Posted by cujo View Post
    God intended PWC to be two strokes, as well as dirt bikes, snowmobiles, and chain saws....

  3. #13
    PWCToday.com Is My Home Away From Home kcr357's Avatar
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    Re: What causes low cmpression

    Quote Originally Posted by linkman View Post
    Gotta love those 4 strokes...
    But you save on gas!
    *rolls eyes*
    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. "

  4. #14
    Top Dog Benflynn's Avatar
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    Re: What causes low cmpression

    Guides will make valves sit off square, seals get replace anyways

  5. #15
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: What causes low cmpression

    Yep, if the seats are bad, guides probably are too. You can buy the parts and get a regular machine shop to rehab the head for you. I would have to guess ride, ride, ride, never change oil................." These 4 strokes are great, theres no maintenance to them"..............DOH!!!
    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

  6. #16
    PWCToday.com Is My Home Away From Home AC 46's Avatar
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    Re: What causes low cmpression

    I think someone sells a complete cyl. Head.

    Wsm?
    R.I.P. Super Sic

  7. #17
    PWCToday.com Is My Home Away From Home
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    Re: What causes low cmpression

    Quote Originally Posted by AC 46 View Post
    I think someone sells a complete cyl. Head.

    Wsm?
    http://www.shopsbt.com/jet-skis/jet-...dexchange.html
    Riding mostly Lake Austin

    1984 JS440
    1989 650sx
    1991 X2
    1992 750sx
    1995 900zxi (qty 2)
    1995 X2

    Quote Originally Posted by cujo View Post
    God intended PWC to be two strokes, as well as dirt bikes, snowmobiles, and chain saws....

  8. #18
    Top Dog Benflynn's Avatar
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    Birmingham
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    Re: What causes low cmpression

    Get a mr gasket sanding roll kit and clean them ports up while the valves are out

  9. #19
    Resident Guru
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    Aug 2008
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    Indianapolis
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    Re: What causes low cmpression

    Every 4 tec I have worked on has leaky and eroded seats, nature of the beast. A lot of guys over on GH use Eric, he does great work, goes by the handle Slow91.

  10. #20
    PWCToday.com Is My Home Away From Home kcr357's Avatar
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    Re: What causes low cmpression

    Quote Originally Posted by Myself View Post
    Yep, if the seats are bad, guides probably are too. You can buy the parts and get a regular machine shop to rehab the head for you. I would have to guess ride, ride, ride, never change oil................." These 4 strokes are great, theres no maintenance to them"..............DOH!!!
    Whats a ball park on machine work?
    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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