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  1. Re: 1990 550SX All original - Time to freshen it up. First service in 30 years.

    I take it back!

    I see them here:

    https://www.partzilla.com/catalog/kawasaki/jet-ski/1990/550-sx-js550-b1/hull
  2. Re: 1990 550SX All original - Time to freshen it up. First service in 30 years.

    Those allen head bolts are not factory.
  3. Re: 1990 550SX All original - Time to freshen it up. First service in 30 years.

    I am the least knowledgeable person on this forum but I suggest that you put an ounce of Marvin Mystery oil in each of the spark plug holes. Put the spark plugs back in and use a fresh battery with...
  4. Replies
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    Re: Super clean JS550s

    You are the Man!
  5. Replies
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    610

    Re: Super clean JS550s

    Man, even your trailer is beautiful. You do beautiful work! When you get a chance would you post up pictures of your trailer including some info on your bunks?
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    Re: Kawasaki SJ 440 or 550 ?

    restosud is correct. You have the best 550 engine, a reed 550sx:

    See:

    https://www.partzilla.com/catalog/kawasaki/jet-ski/1991/550-sx-js550-c1/cylinder-head-cylinder
  7. Replies
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    747

    Re: Kawasaki SJ 440 or 550 ?

    Post up some photos of your engine. Since the 550sx reed engine wasn't introduced until 1992 and you have a 1980 JS440 hull, I would be surprised that you have a 550 reed engine. But post up some...
  8. Replies
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    747

    Re: Kawasaki SJ 440 or 550 ?

    Greetings! Post a photo of the driveshaft coupler on the hull inside the engine bay.

    Study these diagrams:

    https://www.partzilla.com/catalog/kawasaki/jet-ski/1980/js440-js440-a4

    Definitely...
  9. Replies
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    1,161

    Re: 550 FUN build. Options hmm

    Dang! I have an extra Yamaha 6m6 that runs pretty strong. I don't have a 750. I would like to try the 550sx hull with a larger engine...
  10. Replies
    11
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    1,161

    Re: 550 FUN build. Options hmm

    John does the Rhaas conversion kit make the alignment better, but not an optimum fit/alignment?
  11. Replies
    12
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    1,261

    Re: 550sx mysterious gremlin

    Matt, I don't understand.

    How do you ground a plug while running?

    Do you mean start it and then take one spark plug wire off with rubber handled pliers or plug pliers?
  12. Replies
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    3,089

    Re: 550sx reed motor porting, where?

    MCN said: "Same as when you had it... Just a new set of Wossners and a different cylinder head. As far as I know it is running with a single 44 SBN, Coffman half pipe and an SX pump."
    ...
  13. Replies
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    Re: Help, save! How to choose normal shoes?

    I agree with Mhyself am on my second pair of Body Glove water shoes. They are the older model so that soles are coming off because they are so old. I will buy these new ones.
    ...
  14. Re: My first ski / JS550 with a hole in the hull and no spark

    For Electrical Components:

    JetSkiSolutions.com
    @jetmaniac
    @JohnZigler @Watcon
    Partzilla.com
  15. Re: My first ski / JS550 with a hole in the hull and no spark

    Put these on. Watch the video and be gentle!

    https://prowatercraftracing.com/product/440-550-hull-extensions/
  16. Replies
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    1,848

    Re: Anyone mix oils in a jar for testing

    Great!
  17. Re: Looking for recommendations for shipping companies

    Make sure that your pallet is no more than the width and length of your ski. They will charge the width and length of the pallet and the height of the ski with the 6 inch pallet underneath. ...
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    Re: Anyone mix oils in a jar for testing

    Please post up your results! Preferably with pictures.
  19. Replies
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    2,650

    Re: Js550 701 conversion

    That statement says it all. It confirms that you know about riding the 550. It is why I bought a FX-1.

    But the 550 hull is superior to the FX-1 hull IMHO at least with my level of experience.
    ...
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    Re: Js550 701 conversion

    Great! So you haven't put the ski in the water with the 701 yet right? Please let us know how the engine affects the balance and performance of the ski over the 550 engine.

    Also, how do you like...
  21. Thread: Js440/701 build

    by E350
    Replies
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    1,964

    Re: Js440/701 build

    Thanks! Have your buddy join and write his report! I am curious how its balance is.
  22. Replies
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    Re: Js550 701 conversion

    Update?
  23. Thread: Js440/701 build

    by E350
    Replies
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    1,964

    Re: Js440/701 build

    Udate? Ride report?
  24. Thread: Conversion ski

    by E350
    Replies
    44
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    6,815

    Re: Conversion ski

    Ride report update?
  25. Replies
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    4,728

    Re: First stand up, JSX550

    Great video of riding a modified 550sx:

    https://youtu.be/JCTYh5OqXUY
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    Re: First stand up, JSX550

    I have that West Coast head on our '93 550sx. The ski has 185 psi in both cylinders. If you get a chance would you post up a picture of the bottom side of the head?
  27. Replies
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    Re: First JS440 build!

    Congratulations on your first house!!! It will make you poor in the first few years but rich in the long run!

    Is that a jet pump, I/O or straight shaft boat?
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    Re: 550sx Reed Replacement. What are the best?

    https://www.partzilla.com/catalog/kawasaki/jet-ski/1993/550-sx-js550-c3/cylinder-head-cylinder
  29. Thread: Trailer tires

    by E350
    Replies
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    3,784

    Re: Trailer tires

    Great tire:

    https://www.amazon.com/gp/product/B0000AX2ZC/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1#customerReviews
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    Re: A Minty Stock 1990 SJ... Whats next?

    Buy a Heavy Duty pole spring from Watcon (i.e., lightened pole handle).
  31. Replies
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    Re: First JS440 build!

    There are way more knowledgeable people here than me, so I don't know why they aren't posting. So, I will give it a shot and hopefully they will correct me if I am wrong.

    That is a Mikuni carb...
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    Re: Just Bought 2 Vintage Stand Ups

    Looks great! There are zerk fittings for a grease gun in the pump area. I use the small 3-pack Lucas Marine grease tubes in a small grease gun. There may also be a grease fitting in the engine bay...
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    Re: yamaha service manuals

    I have the Yamaha Service Manual and the Owner's Manual for our 1995 FX-1 and 1994 SN SJ. The Service Manual is an absolute must have if you don't want to screw up your ski while working on it.

    I...
  34. Re: Best Battery For Yamaha & Best Practice For Longevity?

    POM: Odyssey Batteries have a great reputation both on the Ford diesel forum and in the Sportsmobile forum. So your experience is consistent with what I have read there.

    Do you put it on a...
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    Re: 1990 Runs great and then loses some power

    Thank you for coming back and posting the solution.
    I had the exhaust hose pop off the muffler, and the exhaust gases also killed the engine due to lack of oxygen when I put the hood back on....
  36. Thread: Which Jugs?

    by E350
    Replies
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    2,214

    Re: Which Jugs?

    Only Scribner's for us. They fit the Fly Racing racks perfectly.

    Often ebay will ship them where amazon will not.

    (Plus they are or were made in Sacramento.
    And we live just a few miles South...
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    Re: 1991 Superjet Factory Bilge location

    Here it is:
    560404

    Couple of things:

    The elbow should be zipped tied up high between the muffler and at the level where the hood connects to the engine bay. If it is not high, the line will...
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    Re: FX1 Showroom or original advertisement images

    You may also want to email your fellow Kiwi, Wax. He used to race the FX-1 and know doubt knows them well:

    https://www.waxracingproducts.com/

    Finally, a reference to proven performance...
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    Re: 1991 Superjet Factory Bilge location

    Are you talking about the passive bilge drain? Partzilla.com has a decent schematic.

    However, Super Jets were never sold oem with an electric bile pump.
  40. Replies
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    Re: FX1 Showroom or original advertisement images

    Please do the article. Also please discuss why it was designed the way it was with the pole pivot. Why it has a pump which was smaller than the Square Nose Super Jet of the time, etc. I have...
  41. Re: Best Battery For Yamaha & Best Practice For Longevity?

    shadetree: Good move buddy. Couple of things:

    1. For your 10 year warranty to be valid, you must Register your 1500 with Batteryminders.com. I would call them. They are very nice. In fact,...
  42. Re: Best Battery For Yamaha & Best Practice For Longevity?

    Hey guys. Everyone should comment on AGM's including me. I started my response, but I want to back it up with a posting of the page of the charging output in amps, rpm and time from the Service...
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    468

    Re: 1990 Runs great and then loses some power

    Check the little fuel screen in the carburetor under the fuel pump. Cured my problem. See what the screen looked like in my SBN44 before and after:
    ...
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    Re: hull repair - fiberlgass

    jslayde1 Everyone here seems to use US Composites and have good results. I use Fiberglass Hawaii out of Ventura California because I have been buying from them for years. Allot of other people use...
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    Re: First JS440 build!

    I have never seen or used a bore gauge, so please post up your use of one when you do it.
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