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  1. #1
    PWCToday Newbie
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    Looking for input, js550 tear down, engine paint, porting etc.

    Have my engine out and want to paint it, what paint do you guys use? Aswell as for the engine bay?
    What other things should I do for maintenance while the engine is out?
    Crank seals done last winter by previous owner.
    The carburetor always worked flawless for me. But I could never turn the mixture screw out enough to make it run rich, it always ran just perfect. Being said I decided to leave the rev limiter hooked up to be safe, but I would like to remove it. Any thing I can do to give it a bit more range of adjustment?

    Since I have it out and the manifolds off, is there a posted set of specs to do a small port job and keep it reliable? Or is it worth the effort on the piston port 550?
    has a kerker pipe, Mariner water box. Stock intake, carb, impeller.

  2. #2
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Looking for input, js550 tear down, engine paint, porting etc.

    You still running the bn38? You can drill out the main jet using a numbered bit set. You can also get the head milled if its stock, mill .035" off it. Buy an aftermarket impeller, the stocker sucks, you can pick up an old school straight 15 pitch for $50.
    I use vht and duplicolor engine paint with good results. Jam wadded up plastic bags in the intake and exhaust to keep water out. Use hot soapy water and a red scotchbrite to wash the engine down. Blow it off with air, then let it dry good. Ready to paint.
    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 Newbie
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    Re: Looking for input, js550 tear down, engine paint, porting etc.

    Yes stock carb on it. I didn't realize it had a jet behind the needle.
    I will take it out and see if I can find a larger one.
    Locally, and almost everywhere I go the colour selection isn't that good and I see everyone has sweet florescent colors, but if I have too I will use the vht or duplicolour choices.
    Been looking for an impeller in Canada mines completely pooched I ate a rock in the fall, still have about 3 months till I can ride it....
    Going to pull the head when I paint it, will see if it appears milled.
    Do people ever three bond the jugs to the base to advance port timing and raise compression on these engines?
    Ive seen it done on different makes and models of engines, like any engine monkeying with the port timing can make it worse if you don't know what your doing, that's why we ask the internet. Lol.

  4. #4
    PWCToday.com Is My Home Away From Home
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    Re: Looking for input, js550 tear down, engine paint, porting etc.

    Stock base gasket is thin so removing it won’t gain much of anything timing or compression wise.

  5. #5
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Looking for input, js550 tear down, engine paint, porting etc.

    First, what year is it?

    Quote Originally Posted by Myself View Post
    You can also get the head milled if its stock, mill .035" off it.
    We used mill 82' to 1990 550's to .060" and install a copper head gasket.

    Since it is very likely you will accidentally knock the base gaskets loose, it is a
    good time to install a copper base gasket.

    There is beneficial easy porting for 82' to 85' 550's. Not so much for 86' to 90'


    Bill M.

    Quote Originally Posted by js440guy View Post
    The carburetor always worked flawless for me. But I could never turn the mixture screw out enough to make it run rich, it always ran just perfect.
    Learn the idle drop test so you can power tune it. If you set the low speed rich
    the carb will run rich.

    38's are great carbs.

    Get an 86' thru 90' exhaust and limited pipe
    Last edited by wmazz; 02-24-2018 at 07:35 PM.
    Horsepower == Speed, RPM != Speed



  6. #6
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    Re: Looking for input, js550 tear down, engine paint, porting etc.

    Quote Originally Posted by wmazz View Post
    First, what year is it?



    We used mill 82' to 1990 550's to .060" and install a copper head gasket.

    Since it is very likely you will accidentally knock the base gaskets loose, it is a
    good time to install a copper base gasket.

    There is beneficial easy porting for 82' to 85' 550's. Not so much for 86' to 90'


    Bill M.



    Learn the idle drop test so you can power tune it. If you set the low speed rich
    the carb will run rich.

    38's are great carbs.

    Get an 86' thru 90' exhaust and limited pipe

    Right now I have a kerker pipe,
    Going to take a gander and check my squish out, see if I need to mill or not, this engine looks like it's been apart 100 times, but always worked good for me.
    I guess I'm used to tuning old tillotson carbs on snowmobiles, I always set the high speed first at WOT then the low speed to a required setting, but as I've been reading the mikuni is pretty similar, but that setup method doesn't really work as well for these. I'll start by doing the proper setup procedure and then find out if I need to tinker from there.
    The ski I believe is an 84, who knows on the year of the engine.
    Couple pics
    IMG_20180223_145616.jpg
    IMG_20180223_214834.jpg

  7. #7
    PWCToday Newbie
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    Re: Looking for input, js550 tear down, engine paint, porting etc.


  8. #8
    PWCToday Newbie
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    Re: Looking for input, js550 tear down, engine paint, porting etc.

    Quote Originally Posted by js440guy View Post


    Anybody have experience using automotive paint on a ski engine??
    Shouldn't really get hot enough to burn it off correct?

  9. #9
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Looking for input, js550 tear down, engine paint, porting etc.

    Engine paint or regular paint? High heat engine paint will not burn off like that.
    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 Newbie
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    Re: Looking for input, js550 tear down, engine paint, porting etc.

    Quote Originally Posted by Myself View Post
    Engine paint or regular paint? High heat engine paint will not burn off like that.
    No I'm talking like a single stage urethane for automotive use.

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