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  1. #1
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    stock 98 gp 1200 pop off?

    I'm working on a 98 1200 with 42 hours. I have checked the pop off on the carbs from that ski all around 72.
    got a set of used carbs today and check one of them and same 72 is this to high?

  2. #2
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: stock 98 gp 1200 pop off?

    Yamaha runs a very high stock popoff. If everything is stock it will be fine. If you're modding a bit just go ahead and lower it to 42-45psi.
    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 Grumpy Old Guy's Avatar
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    Re: stock 98 gp 1200 pop off?

    Stock N/S & 95 gram spring & call it a day.

  4. #4
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    Re: stock 98 gp 1200 pop off?

    sounds good to me I just wanted to confirm thanks guys

  5. #5
    PWCToday.com Is My Home Away From Home
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    Re: stock 98 gp 1200 pop off?

    Serch 65u carb balance mod and do it or they wont work right.

    Myself: I can't believe you don't pass this info along.

  6. #6
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    Re: stock 98 gp 1200 pop off?

    I just wanted these back stock there not skis i plan to keep I put the carbs back on now

  7. #7
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: stock 98 gp 1200 pop off?

    Quote Originally Posted by driftmaster View Post
    Serch 65u carb balance mod and do it or they wont work right.

    Myself: I can't believe you don't pass this info along.
    I know.......I've had a lot going on lately and i think my brain is scrambled.
    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 Grumpy Old Guy's Avatar
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    Re: stock 98 gp 1200 pop off?

    I rebuild 1200 NPV carbs everyday & they run just fine without the balance mod.

  9. #9
    PWCToday.com Is My Home Away From Home
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    Re: stock 98 gp 1200 pop off?

    Quote Originally Posted by Grumpy Old Guy View Post
    I rebuild 1200 NPV carbs everyday & they run just fine without the balance mod.
    If you would do the balance mod you wouldn't have to rebuild them everyday.

    If you really think this you dont have a clue what your doing.

  10. #10
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: stock 98 gp 1200 pop off?

    Seems like they run just fine unless they hiccup or backfire. Then they crease a checkvalve, run that cylinder lean, and blow up. All the blown 65u that I've torn down to date, all had creased check valves in the carb running the blown cylinder. I wouldnt say it HAS to be done.......but the return mod is good preventative maintenance. I actually just got a pair in that will be getting the mod and i also have a customer that wants his done when i winterize them.
    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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