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  1. Replies
    17
    Views
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    Re: JS550 full rebuild

    Will the engine start or run after primed?



    I should have looked at the picture, that is a 82' - 85'. My favorite 550's. Did
    you know the stock impeller was ~19' up to 1986? Real torque...
  2. Re: Looking for input, js550 tear down, engine paint, porting etc.

    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...
  3. Replies
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    753

    Re: JS550 full rebuild

    Did you leave the rev-limiter attached to the return line from the carb, or did
    you remove it?

    It's not going to run without it.

    Is the lever position level with the casting? If it is below...
  4. Replies
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    753

    Re: JS550 full rebuild

    The 1986 550 came stock with a 44bn. But that year 44bn also had problems draining
    the fuel from the float chamber into the engine.


    Bill M.
  5. Replies
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    433

    Re: 750sx pipe selection question.

    This pipe is an example of a design with a steep angled head-pipe immediately
    after the exhaust manifold. Ex manifold diameter at the collector may also be
    too big.

    Judging Peak power on hard...
  6. Replies
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    1,208

    Re: 96 HX - reviving after 18 years of sitting

    It's too bad your customer had so many problems with his first GSX

    At least you took care of your customer the right way!


    Bill M.
  7. Re: Impeller Direction Pitch Down or Up for More Top Speed Based on Peak HP

    Do you have a top speed goal in mind?

    Besides top speed, what other improvements are you looking for?

    What characteristics of your current pipe and set-up do you enjoy the most?



    Bill M.
  8. Re: Impeller Direction Pitch Down or Up for More Top Speed Based on Peak HP

    Yes
  9. Replies
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    1,208

    Re: 96 HX - reviving after 18 years of sitting

    Did the mechanical seal on the driveline have o-ring or a stainless steel c-clip?


    Bill M.

    Probably doesn't matter much, I doubt dealers still sell the o-ring?
  10. Re: Impeller Direction Pitch Down or Up for More Top Speed Based on Peak HP

    With the info Bandit supplied I estimate peak HP between 6400 to 6550 rpm.

    Given the new info, your biggest problem is your Carburation, and maybe the
    main seals if they are the red Performance...
  11. Re: Impeller Direction Pitch Down or Up for More Top Speed Based on Peak HP

    Back in the 80's, factory Yamaha's Ricky Johnson's father wrote an article in one of
    the MX mags about the benefits of using 20:1 oil mixtures. Since then I have found
    other articles and shops that...
  12. Re: Impeller Direction Pitch Down or Up for More Top Speed Based on Peak HP

    The process is similar to setting pilot screws on a car, but a water craft needs to be under
    a load. Specifically a low idle. I prefer ~1000 rpm. The idle should be low enough to hold
    your hand...
  13. Re: Impeller Direction Pitch Down or Up for More Top Speed Based on Peak HP

    2 1/2 turns out on the lows is a rpm killer. You need to find a good setting near
    1/2 to 1 turns out. But first you need to determine what the carbs need. In order
    to figure that out, you need to...
  14. Re: Impeller Direction Pitch Down or Up for More Top Speed Based on Peak HP

    Obviously you are closer to your goal, than you thought. A good dose of tuning
    and you will have a good baseline.


    As I recall the jetting on the Mikuni 38 sbn's from Performance Jet Ski used...
  15. Re: Impeller Direction Pitch Down or Up for More Top Speed Based on Peak HP

    ----------------------------------------------------------------------------
    I made a mistake at the bottom of the page, so I corrected the mistake here. ...
  16. Replies
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    6,923

    Re: Kinda disappointed with a heavily modified 750

    Modify the sxi impeller to fit in a 650 pump.



    Chris should be able to help you with determining a max rpm goal. Then purchase
    a decent tachometer.



    When you get old and fat :) I...
  17. Replies
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    260

    Re: 951 oil lines popped off? 1998 GTX LTD

    I have never seen oil lines pop off like that.


    BM
  18. Re: Impeller Direction Pitch Down or Up for More Top Speed Based on Peak HP

    Sorry I am late! I finally answered the PM.


    BM
  19. Replies
    27
    Views
    1,677

    Re: What else to do?? 750sx

    How much time do you have on this current set-up? If none, how do you know
    that it isn't going to blow up on a long wot pass?

    What is your engine rpm goal?

    Your original cylinder had 178...
  20. Replies
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    784

    Re: Small Victories!! JS550

    Sorry I am late to post.



    Good, aftermarket main seals are junk and will start to leak during break-in.

    3) oem #92049-3006 main seals or oem main seals for 1991 and up 550 reed engines will...
  21. Replies
    6
    Views
    260

    Re: 951 oil lines popped off? 1998 GTX LTD

    There is check valves on the corresponding oil fittings. Use something like
    a mighty vac set-up for pressure testing and test the fittings for a clog.

    3 psi is a normal check valve setting.
    ...
  22. Replies
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    3,276

    Re: Pro mechanics only, need opinions

    No ****

    Usually the spring falls off the seal, In your case it looks like the seal
    fell off the spring :)


    At least it had a spring!


    Bill M.
  23. Replies
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    572

    Re: 91 650sx no tank pressure

    While I truly hope gaskets will help your version of the problem, I am posting
    this because I suspect there is a greater problem than a vacuum leak.



    Your problem with restarting is worse...
  24. Replies
    15
    Views
    572

    Re: 91 650sx no tank pressure

    That is normal!



    You are chasing your tail because you have been reading a Yamaha MX mechanic's web site!



    That is caused by the most common problem that occurs on Kawasaki watercraft.
  25. Replies
    6
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    353

    Re: Coffman 650sx pipe mod?

    You created a steep angled step in the cones that pipe builders call a "flip."
    On the diffuser it triggers a new vacuum wave, and on the baffle cone
    it sends a sound wave back sooner.

    The flip...
  26. Replies
    6
    Views
    353

    Re: Coffman 650sx pipe mod?

    That is a great pipe, leave it alone.

    If you want more acceleration get 44sbn, 8/16 skat, or a 9/17 skat.

    If you have a 15, 15.5 straight pitch, get rid of it. At least bore the
    nozzle .100"...
  27. Replies
    8
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    387

    Re: rebuilt carb question

    The low jet and pilot screw settings are closely related to pop-off.

    Jetting gets richer when you lower pop-off.

    Your old pop-off is an indication that something is wonky.

    It is unlikely...
  28. Replies
    5
    Views
    314

    Re: Seadoo 947r question

    After you replace the cylinder, will the engine seize again?

    Did you find out what caused it to fail?


    Bill M.
  29. Replies
    8
    Views
    387

    Re: rebuilt carb question

    First off, inlet is the bottom fitting, return is the top fitting. If you were testing pop-off
    correctly, very little air comes out the return line because of a restrictor. You might check
    and see...
  30. Replies
    7
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    767

    Re: Running Pre-mix in oil injection ski

    Assuming the oil injection pump is still connected?

    Running the engine without oil in the tank will wear out (ruin) the pump.

    The oil injection pump depends on the injector oil to lubricate the...
  31. Replies
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    3,276

    Re: Pro mechanics only, need opinions

    hyosung, get a grip, there is no easy answer, and the only person that has a
    clear view of the problem is MYSELF.

    If there is a problem with this forum, it is how people want just one simple...
  32. Replies
    74
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    3,276

    Re: Pro mechanics only, need opinions

    Well that explains the spark plugs, but I was also curious why the cylinder head
    domes were washed clean?



    I have been looking at your pictures for a few days and this exhaust port on
    the...
  33. Replies
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    Views
    334

    Re: 1998 750SXI Pro POP-off question

    When you rebuild carbs, you would be better off to ignore alternate pop-off specs.

    Instead, purchase 2 oem Kawasaki springs, and use stock seat diameters. Properly
    set the lever height to level...
  34. Replies
    74
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    3,276

    Re: Pro mechanics only, need opinions

    I was curious, were both engines hard starting, or just the SBT engine?
    Did the 900 have a fuel primmer installed?

    The fouled spark plugs caught my eye. It looks like the front and rear
    plugs...
  35. Replies
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    Views
    3,276

    Re: Pro mechanics only, need opinions

    I have no idea how the #1 cylinder seized the first time, but how the #1 piston
    crown melted, snagged a ring, and then holed the piston; that is easy. Your
    customer is just like thousands of other...
  36. Replies
    74
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    3,276

    Re: Pro mechanics only, need opinions

    535260
  37. Replies
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    Views
    3,276

    Re: Pro mechanics only, need opinions

    I think your customer is stretching the truth. Approximately twenty hours that concluded
    in only one major failure? The pictures in the first post do not support that conclusion.



    Your...
  38. Replies
    27
    Views
    1,126

    Re: What could be the causes of these symptoms?

    For example during the summer a compression test 20 to 30 miles from the beach Kawasaki's
    would be near 175psi, and +60 miles inland (from the beach) it would measure 168 to 165.

    About 10 psi...
  39. Replies
    27
    Views
    1,126

    Re: What could be the causes of these symptoms?

    I thought I read 135psi, But it still sounds just a little low unless you are ~1000' to 1500'
    or the weather is still hot.

    It is common for people to say they have 165psi pwctoday, but you can...
  40. Replies
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    1,126

    Re: What could be the causes of these symptoms?

    135psi, it is possible your compression tester is giving you inaccurate readings that are 30 to 40psi
    lower than normal.

    It is time and money that is well spent and pay dividends in the future,...
  41. Replies
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    1,126

    Re: What could be the causes of these symptoms?

    ++1
  42. Replies
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    1,126

    Re: What could be the causes of these symptoms?

    The gasket that is missing on the fuel tank pick up tubes can cause running issues
    too.



    If you lost it inside the hull, sooner or later it will end up at the back of the
    hull near the bilge...
  43. Replies
    27
    Views
    1,126

    Re: What could be the causes of these symptoms?

    From my point of view, when you replaced the spark plugs, you fixed the parts that failed.

    But the cause of the failure still exists (water in the fuel or a rich condition), and so the
    potential...
  44. Replies
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    1,126

    Re: What could be the causes of these symptoms?

    Must have hit the wrong button. I don't know where my other post went?

    That spark plug has either water or fuel inside the spark gap. Either
    would cause your problem.


    Bill M.530626
  45. Replies
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    1,005

    Re: How to Do 2-Stroke Leak Down Test

    Pressure Test:
    If you didn't remove the inspection plug on the front (flywheel) cover, a pressure leak
    on the front of the engine has no where to go, and so the front cover will seal the
    leak...
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