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  1. Replies
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    Re: A word about cheap compression testers

    When I was a mechanic, I used the geometric compression ratio to
    determine what the cranking compression as a guideline for my
    tune & service compression tests, when the geometric CR was
    in the...
  2. Replies
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    439

    Re: A word about cheap compression testers

    That seems to be a common complaint that compounds the errors.


    Calculating the actual compression is easy, and even for beginner.
    It is a good project to calculate the geometric compression...
  3. Replies
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    418

    Re: Starting point for jetting?

    I am curious what changes you made with the porting? Not specs,
    just general stuff.

    Here is a starting point, I have not tried the specs. These specs are
    intended as a way to learn jetting and...
  4. Replies
    3
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    313

    Re: Option for MSD old school total loss coil?

    On our last MSD powered X2 we used the oem 750 bp ignition coil.

    Over the last few years we have been using the Zeeltronic programmable CDI
    ignitions. Try the PDCIS-A02T if your project is using...
  5. Replies
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    757

    Re: 1991 Yamaha Waverunner III 650 troubles…

    Your stock CDI has a really low rev-limiter of ~6500rpm. On
    the trailer (without a load) it will hit very early. Probably within
    1/2 to 3/4 throttle.

    How it performs in the water is what...
  6. Replies
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    422

    Re: 1986 JS 550 Compression Readings

    But they are expensive.

    And the parts that wear out are available. I prefer removing the
    rubber gasket that seals the spark plug hole, and replace it with
    a metal gasket from a spark plug.
    ...
  7. Replies
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    154

    Re: Spark plug issues on a 1997 rotax 787

    ++1

    A 3000rpm loss is a lot, even for a splitfire.


    Bill M.
  8. Replies
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    154

    Re: Spark plug issues on a 1997 rotax 787

    There is a small performance gain from indexing the stock spark plugs
    when the open end of the bridge faces the exhaust port. This occurs
    because the spark plugs bridge interferes with the fuel-air...
  9. Replies
    27
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    757

    Re: 1991 Yamaha Waverunner III 650 troubles…

    Does the 650 have a fuel primer?

    Did your engine ever backfire while you were trying to start it?

    Did you use starting fluid? Did your engine previously overheat?

    When you lean out the low...
  10. Replies
    3
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    326

    Re: HELP... New rebuild won't run

    20 DEG btdc = 2.83mm on a crank with 750/800 bore, stroke, and rods.

    If you use a digital caliper, be sure to zero it @tdc, or else you
    will need to include (add) the deck height.


    Bill M.
  11. Replies
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    757

    Re: 1991 Yamaha Waverunner III 650 troubles…

    Look at your old cdi to see if it has the Pro-Tec/Dallas Baker Products
    rev limiter mod?


    Bill M.
  12. Replies
    7
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    492

    Re: Jetting recommendations for 760 blaster

    Back when the only carbs were Mikuni BN round bodies or Walbro
    carbs with no jets, only adjustment screws I tried the 3 N&S combos
    available (for the BN), and stupid things like stretching or...
  13. Replies
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    422

    Re: 1986 JS 550 Compression Readings

    The 550 tops out at 125psi. The new 550's (86' to 90') used
    keystone rings and had problems with extreme ring wear. It
    used to be common to disassemble a top end and find a 1/8"
    ring end gap. The...
  14. Replies
    3
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    326

    Re: HELP... New rebuild won't run

    When an engine has too much advance, an engine will "buck."

    What was your static angle? and did you ever confirm your
    initial ignition timing.

    For example: Set the ignition timing to a...
  15. Replies
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    492

    Re: Jetting recommendations for 760 blaster

    I don't understand why 2.5's/65gr with a 12psi pop-off would ever be needed
    by any application?

    Wasn't the stock 760 jetting

    135, 137.5 M
    115 L
    95gr
    1.5 N&S
  16. Replies
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    18,696

    Re: Fabricating Your Own High Performance Cone Pipe

    If you are just building dyno pipes like that guy, there is no
    need for patterns. A little basic math. trammel points, tape
    measure, and a hammer.

    But you do need access to a shear, Beverly...
  17. Re: SXR-800 possible Oil Water Mix in combustion chamber ????

    Stock compression on the SXR is ~175psi. But many people do
    not have accurate compression gauges. The rear cylinder was
    5psi low, and that is concerning. But again it may be low because
    you...
  18. Replies
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    2,044

    Re: Winter project Wave venture 700’s

    That will not work. I have seen a post, where some one made a "T"
    handle extension (or maybe a thumb screw extension) for the stock
    needles. It probably required JB weld.

    On the carb overhual,...
  19. Replies
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    2,044

    Re: Winter project Wave venture 700’s

    Adjust pilot (low speed) screws with the flame arrestor, and
    head stay removed. I use to force my hands into tight spaces
    to work on ski's. You might not want too.

    I had 4 different ways to...
  20. Replies
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    Re: Winter project Wave venture 700’s

    No, but I am curios if you ski has the one-way (3psi) valves in between
    the pump and the flame arrestors?

    Yamaha used to have a problem with there watercraft smoking a lot on
    start up. It was a...
  21. Replies
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    Re: 1996 Wave Venture 1100 Running Rough

    If there is still a small exhaust leak at a exhaust gasket, it is very likely that
    a water is also present. A water leak will also affect the power.

    Because Yamaha used composite gaskets on the...
  22. Re: '91 550 SX Fuel Tank Pressure/ flooding after sitting?

    That set-up should work with an 80gr spring, even a 65gr
    spring! @18psi (but I don't recommend it) without leaking.

    What will get you in trouble is chasing a specific pop-off,
    and modifying the...
  23. Re: '91 550 SX Fuel Tank Pressure/ flooding after sitting?

    That used to be a common problem with 440, and 550's with 2.5
    seats, low pop-off, or a leaking needle and seat.



    ++1

    Your fuel pump works on a pressure differential. The fuel pump ...
  24. Replies
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    Re: fuel primer frustration

    Doubtful.

    But back in ~1985 or so, Kawasaki had a service bulletin on Mikuni
    BN carbs because the choke screws backed out. I replaced many
    cylinders.

    Mikuni failed to properly stake the...
  25. Re: NOS / NWT PJS windbreakers - safety pink and safety yellow/green - SIZE SMALL

    Everything on the shelves were either those colors (all florescent colors), black, or aluminum.

    There were boxes of the same decal in those colors.


    Bill M.
  26. Re: 95 Yamaha WaveRunner (WRA700T) Trouble starting

    Hopefully you don't have to use the choke to start when warm.

    A 700 is hard starting if after sitting for a week or longer, it takes longer
    than 1 minute to start using the choke.


    Bill M.
  27. Replies
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    Re: WTB Kawasaki MSD flywheel and pickup plate

    The size is the only clear advantage I can see. We recently stuffed
    2 Kawasaki pick-ups and a custom reluctor inside a BP750 stroker.

    Hall sensors, or hall sensors with a neo magnet glued to it...
  28. Replies
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    543

    Re: Kawasaki 750 Crankshaft "Slipped" (Broken)?

    ++1


    Bill M.
  29. Replies
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    Re: MSD timing setting old school

    .040" squish offers better performance, and minimizes the possibility
    of detonation.

    Stay away from the early PJS 440, 550 short pipes. The 2550 is best.


    Bill M.
  30. Replies
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    Re: Winter project Wave venture 700’s

    All the manufactures used lean low speed jets. Especially Yamaha.

    The oem Yamaha carbs have a different throttle butterfly angle,
    and the low speed by pass holes were drilled in a different...
  31. Replies
    5
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    580

    Re: MSD timing setting old school

    I remember setting the type1 & type2 ignitions at 28 deg btdc.

    28 to 30 should work fine with an MSD.

    28 deg -> 4.31mm
    29 deg -> 4.61mm
    30 deg -> 4.92mm
    31 deg -> 5.24mm
    32 deg -> 5.57mm
  32. Re: SXR-800 possible Oil Water Mix in combustion chamber ????

    First, head gaskets fail for a reason, Second composite (paper) head
    gaskets are the WORST because they increase the squish clearance
    .030" plus the deck height, plus the step in the combustion...
  33. Replies
    5
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    580

    Re: MSD timing setting old school

    What timing (in deg) do you need. The engine (bore & stroke if not stock),
    are the con rods stock length?


    Bill M.
  34. Re: SXR-800 possible Oil Water Mix in combustion chamber ????

    I sincerely hope you are correct.

    I could be wrong, but this is what I saw in your tiny picture:

    (1) A dark residue over the entire piston crown.

    (2) light (gray) color vertical patches...
  35. Replies
    11
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    1,905

    Re: 1996 Wave Venture 1100 Running Rough

    ++1

    If there is an exhaust leak, what caused it?


    Bill M.
  36. Replies
    19
    Views
    2,044

    Re: Winter project Wave venture 700’s

    Most people wouldn't make a change, but I think even a bone
    stock 700 would benefit from a small increase in the low jet,
    (2 sizes) #72.5. I would try leaning the pilot screw a little too.
    Start...
  37. Replies
    6
    Views
    578

    Re: WTB Kawasaki MSD flywheel and pickup plate

    How are you going to handle the static margin setting?

    You need some way to trigger the ignition, and still have time to
    calculate the curve.

    I don't see an advantage over the pickup coil....
  38. Replies
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    1,841

    Re: 97 GTI carb settings?

    So this is really just a chance to learn more about your carburetor, than a
    problem that affects the performance of the GTi in normal riding conditions.

    At a dealership, this would not be...
  39. Replies
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    1,841

    Re: 97 GTI carb settings?

    Does your bog occur when you give the engine throttle slowly?

    If not, how do you recreate the bog while testing?


    Bill M.

    Did you reuse the carb base gasket?
  40. Replies
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    1,841

    Re: 97 GTI carb settings?

    All too often people on this forum seem to think "pop-off" is
    some kind of silver bullet. Problems occur for a reason, something
    causes that problem and because someone !%@#** POS posted
    his...
  41. Replies
    6
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    542

    Re: 787 rotory valve clearance

    Do you have any pictures of the rotary valve cover? If it has
    too much clearance, the RV cover was worn from something like
    water ingestion, or it does not show signs of wear and is clean
    with no...
  42. Replies
    16
    Views
    1,841

    Re: 97 GTI carb settings?

    It has been too long since I tuned a 97' GTI, but the idle drop test will get you
    close, especially if you decreased the pop-off.

    On many of the SeaDoo's the idle drop test settled in ~3/4 turn,...
  43. Replies
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    481

    Re: 95 xp motor swap question

    Both engines basically have race porting near 200 degrees of
    exhaust duration. The 720 can make good power despite the
    short stroke.


    Bill M.
  44. Replies
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    481

    Re: 95 xp motor swap question

    Maybe you can find an HX 785 conversion thread?


    Bill M.
  45. Re: SXR-800 possible Oil Water Mix in combustion chamber ????

    Seized.

    Was the head gasket blown?

    If I was to guess, when you were riding and the engine shut off
    like it ran out of gas or something. Then it restarted and seemed
    to run fine.

    That...
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