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  1. #1

    how to more speed out of a group k 1390 in xlt 1200

    have vf 3 reeds ,novi carbs 48 mm, ir holeshot kit, jims plate,ho pump with dynafly 14/23 prop


  2. #2
    badjoka's Avatar
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    whew! The group K big bore high octane maxes out the moror correct? Are you thinking very high compression and race gas?

  3. #3
    Yellow93's Avatar
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    Quote Originally Posted by rideryamaha View Post
    have vf 3 reeds ,novi carbs 48 mm, ir holeshot kit, jims plate,ho pump with dynafly 14/23 prop
    What speeds are you getting right now?

  4. #4
    zx11rider's Avatar
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    Quote Originally Posted by Yellow93 View Post
    What speeds are you getting right now?
    +1 lol you never said what speed or rpms, you need to talk to Jim he can make that ski fast. http://www.greenhulk.net/forums/show...XLL&highlight=

  5. #5
    Crash Test Dummy Smitty's Avatar
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    +1 on Jim. He's the man when it comes to making those big hulls go fast.

  6. #6
    Add triples and an advent, and be prepared to use lots of fuel.

  7. #7
    around 71 mph

  8. #8
    Yellow93's Avatar
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    Advent... get porting done if its not already... my XLT was probably similar to yours but with TJ porting, advent and gas valves and my ski ran right around 74. Jim knows all the tricks!

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