Cylinder Head Repair Options
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  1. #1
    PWCToday Newbie
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    Cylinder Head Repair Options

    Rebuilding a 99 GP 1200 npv, and the head is messed up pretty badly. From my understandings, my options for repair would be resurfacing and milling. Are there any other options, and what's the pro's and cons of each option? I will attach some pictures of the head. Thanks!


    125093442_916876632177200_1785613984691959040_n.jpg
    124480500_3556029251157551_1241301958475889767_n.jpg

  2. #2
    PWCToday Regular CALJET's Avatar
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    Re: Cylinder Head Repair Options

    A machine shop could mill the domes and resurface ---but I bet it would be cheaper just to find a good used cylinder head.

  3. #3
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Cylinder Head Repair Options

    A good used head would run about $100. Proper milling on that one will probably run about $100. Take your pic.
    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

  4. #4
    PWCToday Newbie
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    Re: Cylinder Head Repair Options

    Say I got it milled. It would increase compression right? Then I would maybe have to run higher octane, and would anything have to be done to the cylinders/pistons to compensate for the milling?

  5. #5
    PWCToday.com Is My Home Away From Home WFO Speedracer's Avatar
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    Re: Cylinder Head Repair Options

    Personally I wouldn't want to increase compression on one of these engines
    Y'all know me, still the same O.G. but I been low-key
    hated on by most these &^$$@s with no cheese, no deals and no G's, no wheels and no keys, no boats, no snowmobiles, and no skis, mad at me cause I can finally afford to provide my family with groceries

    WWSRD , What would Speed Racer do ?

  6. #6
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Cylinder Head Repair Options

    For starters, those heads are actually cast wrong right off the bat! The squish is reversed, actually trapping gasses out near the cylinder wall. A good machinist can recut those squish bands thus cleaning up the damage but ALSO lowering compression. THEN the whole head gets milled to bring that compression back up. 135psi works GREAT on those with 91 octane.
    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

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