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  1. #1

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    Rebuild or buy: FX 140 engine, get an SBT, used one & from where?

    I have a 2003 FX 140 Yamaha engine with a spun bearing at the connecting rod. All else is ok. A Crank weld, true & regrind to specs runs about $350 (Falicon). I will need 1 connecting rod, the set of pistons, and cylinder hones, plus gaskets & time to assemble. Boat was shelved for several years post knock. it eventually locked.

    A rebuild w/1 year warranty (excluding labor to remove & install) is about $1,700 plus shipping, and i'm not looking to spend that much.

    Haven't shopped salvage PWC's w/ low hours on motor, but welcome some leads.

    My concern is that an itemized take-off to rebuild the current motor would probably end up costing close to, if not the same as a 3rd party rebuild. However, i would make sure to use Yamaha OEM seals, o-rings & matched pistons, etc. The rebuild would certainly save time assuming no issues arise.

    I have successfully re-powered several 66 power valve engines, Chevy 350, LS's & Buick turbo GN's, but this would be the first PWC 4 stroke, which is a completely different & costly animal.

    Any advice?


  2. #2
    Ski Hacks MG's Avatar
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    Just say no to SBT engines.

  3. #3

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    The $1795 that SBT charges does not include any welding/repair to the parts of your motor. You'll pay for the crank repair and the con-rod on top of their advertised price.

    On the other hand, the MR1 motor is a bit more complex than any of the other motors I've repaired. You'll need to spend about $150 on bolts that are not re-useable. There are quite a few hoses and clamps that common sense says to replace while you have the motor out. I have an 04 that just needs the pistons replaced. I already picked up a good used set and honed the cylinders pretty clean. But I can't seem to convince myself that it's worth the time and expense to repair the ski when I can pick up a good-working used one for $3-4K and get most of that back by parting out this one. If I do rebuild it, it will just be so that I can say I did it.

    Where in NY are you?

  4. #4
    Ski Hacks MG's Avatar
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    Quote Originally Posted by FlMike View Post
    Theres nothing wrong with SBT engines if you fix the problem that caused the original motor to fail.
    How long have you been in and around the PWC industry?

  5. #5

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    Quote Originally Posted by grumpy_steven View Post
    The $1795 that SBT charges does not include any welding/repair to the parts of your motor. You'll pay for the crank repair and the con-rod on top of their advertised price.

    On the other hand, the MR1 motor is a bit more complex than any of the other motors I've repaired. You'll need to spend about $150 on bolts that are not re-useable. There are quite a few hoses and clamps that common sense says to replace while you have the motor out. I have an 04 that just needs the pistons replaced. I already picked up a good used set and honed the cylinders pretty clean. But I can't seem to convince myself that it's worth the time and expense to repair the ski when I can pick up a good-working used one for $3-4K and get most of that back by parting out this one. If I do rebuild it, it will just be so that I can say I did it.

    Where in NY are you?

    I'm in the Brooklyn/Queens Border

    I think this will be my first and last MR1 rebuild.
    So far, I've spent:
    250 Crank Conn: weld, re-grind, polish, true
    100 Pistons (set)
    160 Hone Block
    My next big ticket item will be a valve head and boy am i thinking long and hard about it.

    If you come accross anything i can use, let me know.

  6. #6

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    Quote Originally Posted by CCW View Post
    Quote Originally Posted by FlMike View Post
    Theres nothing wrong with SBT engines if you fix the problem that caused the original motor to fail.
    How long have you been in and around the PWC industry?
    about 7 years

  7. #7
    Ski Hacks MG's Avatar
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    Quote Originally Posted by FlMike View Post
    Quote Originally Posted by CCW View Post
    Quote Originally Posted by FlMike View Post
    Theres nothing wrong with SBT engines if you fix the problem that caused the original motor to fail.
    How long have you been in and around the PWC industry?
    10 years
    And you support SBT's engine rebuild service?

  8. #8
    powerstroke specialist mikegp's Avatar
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    Quote Originally Posted by FlMike View Post
    Theres nothing wrong with SBT engines if you fix the problem that caused the original motor to fail.
    wait , wait , wait , you are 100% right , there's nothing good about SBT engines . plain and simple .

  9. #9
    powerstroke specialist mikegp's Avatar
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    Quote Originally Posted by CCW View Post
    Quote Originally Posted by FlMike View Post
    Theres nothing wrong with SBT engines if you fix the problem that caused the original motor to fail.
    How long have you been in and around the PWC industry?
    let's see , looking at the date he join this beautiful forum , 2 years . lol

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