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  1. #1
    PWCToday Newbie
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    Inexpensive, but effective 951 mods

    So i sent my top end out to be measured, so i could order a top end kit. Kit is on the way and cylinders waiting. While im building a fresh engine, im curious what are some inexpensive but effective mods i can throw on this engine while im rebuilding it? I dont want to shorten the life of engine by going too extreme. I saw a couple performance parts for sale in classifieds and wondering if i should grab them?

  2. #2
    PWCToday Regular
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    Re: Inexpensive, but effective 951 mods

    Depends how far you want to go and your goals. The 951 is already a very capable engine and will be plenty fun for most when dialed in perfectly

    Mild head, prop, intake grate, sponons = nice rec ski that doesn't suck gas

    Add a moderately aggressive pip to the above and flame arrestors, +rejet = little more finicky to dial in, sucks more gas, nice pull through the rpm range.

    Past that a more aggressive head/pipe is probably going to start effecting the lifespan of the engine due to higher rpm and you'll need mods to support those RPMs

    Its a slippery slope
    Last edited by Hishman; 09-22-2017 at 11:18 PM.

  3. #3
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Inexpensive, but effective 951 mods

    The 951 responds really well to a bump in compression. You can have the stock head milled about .020 thou. Also put on a nice intake grate and impeller.
    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: Inexpensive, but effective 951 mods

    Sweet. Ill drop the head off to my machinist.

  5. #5
    PWCToday Newbie
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    Re: Inexpensive, but effective 951 mods

    What brand intake grate should i go with? R&D, Worx, solas?

  6. #6
    Top Dog Benflynn's Avatar
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    Re: Inexpensive, but effective 951 mods

    Get cyls ported

  7. #7
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Inexpensive, but effective 951 mods

    Any of the winged style intake grates help hookup WAY better than stock. The larger the scoop, the more top end speed you lose. The Worx grate is very popular on the GSX.
    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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