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  1. #1

    2 stroke vs 4 stroke waterbox

    doing an fxho mr-1 4 stroke conversion in an xlt hull. wondering about the waterbox. is the 2 stroke waterbox going to have too much restriction? should it be modified?

  2. #2
    o uncola o's Avatar
    Join Date
    Aug 2008
    Pittsburgh, PA
    I am running a 2 stroke waterbox with the 1500sc rotax and it does not seem to be too restrictive.

  3. #3
    cheatin' piston popper addicted's Avatar
    Join Date
    Jul 2006
    north jersey
    its actually less restrictive.

  4. #4
    i ended up using a wave venture 1100 waterbox in my xlt hull. they are same dimensions externally with the exception the inlet pipe is correct size for a 4 stroke not the huge opening for the 2 stroke pipe. i cut the waterbox open and gutted it. removed all the restrictive baffles. the inlet pipe points up now to the top of the waterbox, and the outlet pipe is cut and angled to control the height of water in the waterbox. i also shortened it quite a bit. no longer have the silver submarine in the back of my hull just a small waterbox that should do the job.
    should be alrite on a slightly modified fxho motor in an xlt hull.

  5. #5
    some pics if anyone is interested.
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