Another 640 Tigersaki build
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  1. #1
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Another 640 Tigersaki build

    Let me start by saying I was inspired by a few other members who have done this already. I've had these parts for a while and will update as I find time to work on this. The ski is an '85 or '86 JS550 with exhaust exit on the right side. The donor parts came from a couple old Tigersharks. My plan is to put this thing together and work out the bugs, then tear it down for custom paint and mats. Here is the ski as it sits.
    Attached Images Attached Images
    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

  2. #2
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Another 640 Tigersaki build

    I had a running engine that I tore down for inspection and new seals.
    Attached Images Attached Images
    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

  3. #3
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Another 640 Tigersaki build

    There was a blob of JB Weld on the case. Something must have come apart at sometime in the past cause there was a small hole. I had it welded up then ground it smooth.
    Attached Images Attached Images
    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.com Is My Home Away From Home Myself's Avatar
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    Re: Another 640 Tigersaki build

    For those who are not familiar with the Tigershark 640, they are 72-78hp (depending on carbs and pipe) and have this strange twisted porting arrangement. The port to sleeve, and the cylinder to case matchup is VERY good on these.
    Attached Images Attached Images
    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

  5. #5
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Another 640 Tigersaki build

    Piston to cylinder clearance was good after honing so I'm using the pistons as they are. A 550 or 650 coupler will screw right on to the Tigershark crank. I happen to have a 650 version on hand.
    Attached Images Attached Images
    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. #6
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Another 640 Tigersaki build

    After trueing up the head and cylinder deck I mocked up the top end and torqued the bolts with NO base gasket!! Squish with stock head and steel head gasket came in at .055". I'm thinking that should be fine on 91 octane but will know for sure after I get cranking compression readings. Trying to get all the low end punch I can out of this and lowering the port timing with no base gasket will help. I sprayed the old head gasket with copper coat and buttoned up the top end.
    Attached Images Attached Images
    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

  7. #7
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Another 640 Tigersaki build

    Save for more
    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
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Another 640 Tigersaki build

    And more
    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

  9. #9
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Another 640 Tigersaki build

    And more...
    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

  10. #10
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Another 640 Tigersaki build

    Some of my parts.
    Ocean "PRO" rideplate
    Unknown bars, maybe 5* bend
    Gas cap and neck
    Solas 15/20 impeller, hoping that's enough
    And single 44mm carb with flame arrestor.
    Attached Images Attached Images
    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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