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  1. #21
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    Re: JS 550 Crank seal question

    Its completely stock around 140psi and i run regular pump gas...

    Everything i read on here was that this was the thing to do for a typical ski.

    Anyone care to elaborate?


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  2. #22
    PWCToday.com Is My Home Away From Home Chester's Avatar
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    Re: JS 550 Crank seal question

    Quote Originally Posted by PWCguy123 View Post
    ...Everything i read on here was that this was the thing to do for a typical ski...
    Who says that?

    I wouldn't go more than 4 or 5 degrees advance.

    Chester
    Speed is very expensive. How fast do you want to spend?

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  3. #23
    PWCToday.com Is My Home Away From Home mcn6's Avatar
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    Re: JS 550 Crank seal question

    Elaborate?

    Advancing ignition timing changes the degree of crankshaft rotation at which maximum combustion chamber pressure occurs. Too much advance = excessive combustion chamber temps, detonation and seized piston. Not enough advance = A portion of the fresh fuel charge exiting the exhaust port unburned and loss of power.

    550 stock ignition timing and compression were designed by Kawasaki for the crappiest gas you would typically expect to find at some back woods marina somewhere. Running "fresh" premium pump gas with a pp 550 typically allows advanced ignition timing and/or increased compression, but that doesn't mean you should run amuck clocking the stator plate full advance!


    Quote Originally Posted by PWCguy123 View Post
    Its completely stock around 140psi and i run regular pump gas...

    Everything i read on here was that this was the thing to do for a typical ski.

    Anyone care to elaborate?


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    Last edited by mcn6; 12-17-2017 at 02:41 PM.



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  4. #24
    Frequent Poster JustStandups's Avatar
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    Re: JS 550 Crank seal question

    Group K just did a great tech write up on 550 timing. Definitely agree don't advance it all the way.

    http://www.pwctoday.com/showthread.php?t=477773

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  5. #25
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    May 2013
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    Olalla, WA
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    Re: JS 550 Crank seal question

    Alright, looks like i get to take it apart again. Will set back to factory settings.

    The thread i was reading was from 2008 so maybe its a bit out dated...


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    JS 550 85'
    JS 550 87'
    SX 300 91'
    X2 89'
    SL 650 Triple 92'

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