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  1. #1

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    slx 1200 conversion

    I have a 1999 slx 1050 that i am converting to a 1200 so i picked up my donor ski which is a 1999 genesis i just took it apart and im going to replace the top end and put a new crank in it because the crank was rusted stuck. my first question of many is i have an extra 1050 crank oem that is nos brand new never run and ive been told that the 1200 cranks are different so i put the two side by side and they looked identical and the strokes lined up so can i use that in my 1200 engine or do i need to buy a 1200 crank.


  2. #2
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    You need a 1200 crank. 1050 is a 68 stroke 1200 is 70.

  3. #3

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    okay im glad i asked do you know if the reeds are different i have the 1200 stock reeds but i have a nice set of v force reeds for a 1050 or are those also different.

  4. #4

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    reeds are the same and as far as the cranks go post pics they shouldn't look the same one is a full circle crank and one is a pork chop crank

  5. #5

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    Okay thanks, the cranks do look identical for some reason

  6. #6
    Im doing this swap this summer. The 1200 Cdi plugs into the 1050 box correct? Just a direct swap out with the 1200 motor and cdi? No surprises? I wouldnt think so.
    I think mines a 99 1050 hull.

  7. #7
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    Quote Originally Posted by caliburst View Post
    Im doing this swap this summer. The 1200 Cdi plugs into the 1050 box correct? Just a direct swap out with the 1200 motor and cdi? No surprises? I wouldnt think so.
    I think mines a 99 1050 hull.
    One potential gotcha, and there is a workaround, is if the compared terminal boards have or don't have diodes in the warning/HOT/RPM limit configuration.

    Check the OEM wiring diagrams for both the donor model/year and the recipient model/year. Look at the electrical box wiring for the Tan and/or Gray wire signals. If one terminal board has diode(s) and the other does not, that is your heads up to check further.

    Related to this is that some of the earlier MFD (1996, 1997 ...?) needed the diode(s) to prevent false HOT warnings on the display.

    Note to self; Perhaps I should spend some time figuring out what MFD and CDI combos needed those isolating diodes
    It might be the case that only the Gen I and Gen II domestic original CDI cause trouble with the early MFD. I could not say for sure without doing some testing and cross referencing...

  8. #8

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    Yup I plan to just switch everything over I'm not to sure on the mfd I need to look what a 1200 pro uses and then see from there that way the mfd will work.

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