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  1. #1

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    pump exit bore???

    i was wondering what the best size is to bore my pump exit to for the best hole shot? its a 92 sl650 with upgraded 95 pump and soon to be 750 engine ! also what is the best pitch impeller to run for holeshot and would a 3 or 4 blade be better or is there a choice?


  2. #2
    Water Bum Rodneyae's Avatar
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    Welcome to the HULK!!!

  3. #3

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    Thanks!!!!!!!!

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  6. #6
    ph2ocraft's Avatar
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    WELCOME to the Green Hulk Warrior!!

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Welcome to the Hulk Warrior.
    The pump venturi seems to do well with the 87mm exit, stock is 84.
    Skat Trak swirl impellers will give yopu the best hole shot. A 13/18 does well with a 750.
    Also consider a longer ride plate for quicker planing, and add trim if you don't already have it.
    Jet works valve will also help on acceleration as well as a performance waterbox. BUT the waterbox will make your ski alot louder than stock.

  8. #8

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    what is the jet works valve? and would a 650 performance water box work or do i need to get a 750 ? what is the best?

  9. #9
    AWA Member 32DegH2O's Avatar
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    Quote Originally Posted by 450warrior View Post
    what is the jet works valve? and would a 650 performance water box work or do i need to get a 750 ? what is the best?
    It's an adjustable waterflow devise that fits on the waterline to the exhaust pipe stinger. It restricts the amount of water to the stinger which prevents the waterbox from loading up while at idle...also reduces waterflow at low rpms...helps give better throttle response for acceleration. Definitely worth the $30 for one.

    http://www.jetworks.net/

  10. #10
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by JetskiMN View Post
    It's an adjustable waterflow devise that fits on the waterline to the exhaust pipe stinger. It restricts the amount of water to the stinger which prevents the waterbox from loading up while at idle...also reduces waterflow at low rpms...helps give better throttle response for acceleration. Definitely worth the $30 for one.

    http://www.jetworks.net/
    What he said ^^^^^

    And the 650 would be the same as a 750 or 780 waterbox. Group K used to supply DG tri oval water boxes on their beefed up 750 packages. I have one for sale if interested.

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