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  1. #1
    Murfs66
    Join Date
    Apr 2008
    Location
    So-Cal
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    3

    Oldschool JS300 modifications

    Newbie /olbie..... I am getting back into the ski thing. Just wanted to ask if there is anything I can do to a JS300 that will make it better. i just found one for a good deal. It runs great.


  2. #2
    South Atlanta white trash MILF Hunta's Avatar
    Join Date
    Apr 2008
    Posts
    47
    +1
    1
    Put a JS 550 motor in it.

  3. #3

    Join Date
    Apr 2008
    Location
    wisconsin
    Posts
    4
    Back in the day I had a js 300.
    I put a Mariner chrome pipe on it, bigger carb (a 38 mm mikuni I THINK)
    boysen reeds, KN filter and a S.S. impeller (15.5 or 16.0 pitch).
    It was faster than my buddys stock js 650!!
    It was my first jetski, and alot of fun.


    CHRIS

  4. #4
    Murfs66
    Join Date
    Apr 2008
    Location
    So-Cal
    Posts
    3
    I'm gettin gthis ski for about $20 into the deal. I'm trading him for a few things. The guy says it runs and the body is in great shape. The only thing it has wrong is the DMV fees. No matter.


    What parts will fit on this ski from other 440's and 550's?

    how about a prop? Is it the same as the others?

    I definately want to fix this thing up to make it fast, but I want to do it right the first time.

    Remeber I only have $20 in the deal, so I'm open for performance parts to buy. I dont know whats on the motor yet.

  5. #5
    thesepaperwings's Avatar
    Join Date
    May 2007
    Location
    South East Kansas
    Posts
    1,283
    +1
    1
    Go to groupk.com and read the file on the 300.

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