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  1. #1
    5Bulldogs's Avatar
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    sfx15f sheared crankshaft woodruff key?

    Have a 08 kawasaki stx15f that I thought had a bad starter bendix. I pulled the motor today to find the flywheel loose and spinning on the crankshaft. There is a slot on the flywheel for a woodruff key but I can not find one on the crankshaft.

    This is a SBT motor that was installed a few years back and has been sitting since it was installed. I assume whoever installed it got it back together and gave up.

    Do all 15f motors have a slot for a woodruff key?

    thanks,
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  3. #3

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    Is there a keyway milled anywhere in that crank. Hard to tell by the pics supplied. That other post really does not go anywhere either. I know these rotors are pressed on pretty good. I assume your "press fit" came away. Best way to pin it (without removing the crank) if the crank does not have a slot is look at the GM LS crank pin kit cause the GM engineers figure a keyway is not needed either. Ebay has them. Let us know how you progress.

  4. #4

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    The newer 15F (2008+), Ultra LX and Ultra 250 motors have a newer crankshaft with no woodruff key slot.

  5. #5
    5Bulldogs's Avatar
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    Quote Originally Posted by grumpy_steven View Post
    The newer 15F (2008+), Ultra LX and Ultra 250 motors have a newer crankshaft with no woodruff key slot.
    Correct, I called and talked to sbt. They said to apply locktite and really torque it down. Just finished installing the motor back in the jetski and fired it up. So far so good.

    thanks for the help,

  6. #6

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    I wonder if you'd be better off with the newer flywheel, which also doesn't have a slot for the woodruff key. It might hold tighter without that gap. It seems unusual that the flywheel would come loose.

  7. #7
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    without the liberal application of red loctite, they WILL come loose the first time the pump hooks up after being airborne at redline

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