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  1. #1

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    2010 STX 15F Has no key slot in crankshaft for Rotor. How does it stay tight?

    Hi, I have a 2010 STX 15F and I bought a SBT Premium engine to replace my defective original engine. The new engine does not have a key slot in the crankshaft for a woodruff key for the generator rotor. I cant remember if the original engine had one or not. I already turned it in as my core replacement. Is this normal and if so, how does the rotor keep from rotating on the crankshaft when the starter turns it? Also, do I need to put anything on the shaft when I install the generator rotor? I am surprised to not see a keyed shaft. Thanks.


  2. #2

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    Im not 100% familiar with the 15f but i know on the 250-260-300-310's its splined to keep it from spinning. So you'd slide it onto the crank, bolt the pto cover on and once you tighten the output shaft thats what keeps it from moving.... give me a bit and ill post some pictures

  3. #3

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    Here's a coupleClick image for larger version. 

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  4. #4

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    Thanks for the reply. That setup is totally different than the 15F. My crankshaft has a tapered shaft that I would think should be keyed but its not. The output shaft threads on and tightens the rotor down onto the crankshaft. The inside diameter of the rotor shaft is tapered and matches the crankshaft taper. I guess its machined so close that it fits tight without the need for a key. Your rotor looks about the same as mine. But I dont have splines. According to the part numbers at SBT, the 2007 through present dont have the keyed shaft. The 2006 and before do. I guess its OK or Kawasaki would have changed it by now. It just seems strange to me. I've never seen a tapered shaft that is just a pressed fit. Most have keyways and woodruff keys.

  5. #5
    steve45's Avatar
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    Does your flywheel have a keyway?

  6. #6

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    Yes, The flywheel has a keyway. I got a feeling that Kawasaki uses the same flywheel for several models. And, its the same for the older STX15Fs. What you are calling the flywheel, I call the Rotor. Its the part that the starter engages with during starting. Its also the generator housing that has the magnets in it.

  7. #7
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    best to call SBT on this one, there are some references in the parts diagram to the woodruff key and I make it as 06 and previous. no blue tape on the nose of the crankshaft?

    You'll need some direct access to a kawasaki wizard who would know the specifics of the vauge reference to the 06 crankshaft picture on the parts diagram showing the key. They key is only listed on 06 and earlier, not listed for the later models

  8. #8

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    nmpeter,
    Yeah, I agree. I actually called them first but they are not in on weekends. Unfortunately, the weekend is when I have the most time to dedicate to projects like this. I will call them Monday. Im pretty sure all is fine but I need to check. Thanks.

  9. #9
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    And.....?

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