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  1. All of the major bearing manufacturers sell...

    All of the major bearing manufacturers sell various lines of Chinese made bearings.
    While manufactured in China they are built to each companies specs. Which isn't what you get when buying from...
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    Jet chart picture rotated correctly. Rob

    Jet chart picture rotated correctly.

    Rob
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    These are pictures of the Link&Sync instructions...

    These are pictures of the Link&Sync instructions in one of my service manuals. Maybe it will help.

    One picture is a factory jet chart.

    Rob

    P.S.
    Carburetors are very sensitive to float...
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    These are the flow numbers of a stock reed plate...

    These are the flow numbers of a stock reed plate versus a Yamaha 500CC jetski V reed block shown in the pictures.

    71385

    Rob
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    I will just leave these here for discussion...

    I will just leave these here for discussion fodder.


    71381

    71382

    71383

    71384
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    I purchased this engine used so I am not sure of...

    I purchased this engine used so I am not sure of the lineage of the carb. The motor itself is a 1981 25hp Commercial Engine (mistakenly identified as 35hp above in previous post).

    The carb does...
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    I am running a 59D jet. Let us know how that...

    I am running a 59D jet.

    Let us know how that carb works out.

    Rob
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    Sticky: Is spark plug heat range a possible culprit? ...

    Is spark plug heat range a possible culprit?

    Edit:
    Too cold of a plug can give you fits.

    Rob

    Sent from my SAMSUNG-SM-G900A using Tapatalk
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    You might try a full lenght cavitation plate to...

    You might try a full lenght cavitation plate to keep more water around the prop to prevent blow out at the upper height if you want to stay with the Power tech prop. Not saying it will go faster, but...
  10. WebCam Racing Cams can modify factory camshafts...

    WebCam Racing Cams can modify factory camshafts to a certain degree. That would be my first goto if hp gains were wanting to be had on a 4-stroke.

    Webcamshafts.com

    RobT

    Sent from my...
  11. Oh my. That was the first boat race I have...

    Oh my.

    That was the first boat race I have ever watched on YouTube that actually had me setting on the edge of my seat chomping my nails. The action was good, but that announcer was great. He...
  12. This is a quote from Larry Meaux, the man I would...

    This is a quote from Larry Meaux, the man I would argue has dyno'ed and collected more data on automotive racing engines than anyone I know of.

    This is from a forum post over on speedtalk.com...
  13. This is a quote from Larry Meaux, the man I would...

    This is a quote from Larry Meaux, the man I would argue has dyno'ed and collected more data on automotive racing engines than anyone I know of.

    This is from a forum post over on speedtalk.com...
  14. Mike covered the main points above perfectly. ...

    Mike covered the main points above perfectly.

    Also keep in kind the following..

    All non metal components in the fuel system must be compatible with methanol.

    The fuel pump and fuel lines...
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    Nothing special about my $100 motor other than...

    Nothing special about my $100 motor other than cheap.

    The picture tells the tale. The wheel I have does not have that tube-like feature.
    Mine is what is called for in my service manual though. ...
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    The factory test wheel... I have an '81 35hp...

    The factory test wheel...

    I have an '81 35hp commercial engine that I recently picked up. I can tell the power head has been removed so I have no idea what all has been done to it.

    I do know it...
  17. Thread: Johnson "70mod"

    by PPRINT
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    Looking really nice. Did you machine those...

    Looking really nice.

    Did you machine those stacks? Or were they off-the-shelf item?


    Rob


    Sent from my SAMSUNG-SM-G900A using Tapatalk
  18. Is that out of a CAD system? Or something out of...

    Is that out of a CAD system? Or something out of Dynomation?

    Rob

    Sent from my SAMSUNG-SM-G900A using Tapatalk
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    Thanks for the response Dean. I ran across...

    Thanks for the response Dean.

    I ran across some older posts that made reference to Seaway possibly having stock on them but was not sure if that still held true today. I will call on Monday and...
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    Race lower unit with water pump?

    Hello all,
    I'm gathering data and parts for an OMC SST45 clone engine that will be mounted on a fabricated tower.

    My question is, are there any racing lower units that have provisions for a water...
  21. Dynomation requires the input of the cross...

    Dynomation requires the input of the cross sectional area of the intake and exhaust system at various locations in the port, along with their port lenghts, the crankcase compression ratio, and the...
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    https://www.seawaymarine.com/sst-race-parts ...

    https://www.seawaymarine.com/sst-race-parts

    Seaway has the parts list online.

    Rob
  23. There is a 2-stroke version of Dynomation sold by...

    There is a 2-stroke version of Dynomation sold by motionsoftware.


    Rob



    Sent from my SAMSUNG-SM-G900A using Tapatalk
  24. You have my curiosity up. Are you looking for...

    You have my curiosity up.

    Are you looking for port data from a sample engine?

    Just port window size data, or discharge vectors? Maybe port cross section data?

    Rob
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