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Thread: GPR Pumps

  1. #1

    GPR Pumps

    What is the difference between the regular GPR pump and the GPR HO pump?


  2. #2
    hub size. ho pump is larger diameter hub. also the gpr ho has a longer driveshaft with the 2" pump spacer.

  3. #3
    westy's Avatar
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    Quote Originally Posted by slociviccoupe View Post
    hub size. ho pump is larger diameter hub. also the gpr ho has a longer driveshaft with the 2" pump spacer.
    almost correct the 2 inch extension and shaft was fitted to the 03 GPR and 04 GPR with old small hub pump, the Ho pump came out in 05

  4. #4
    Sayers's Avatar
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    Quote Originally Posted by westy View Post
    Quote Originally Posted by slociviccoupe View Post
    hub size. ho pump is larger diameter hub. also the gpr ho has a longer driveshaft with the 2" pump spacer.
    almost correct the 2 inch extension and shaft was fitted to the 03 GPR and 04 GPR with old small hub pump, the Ho pump came out in 05
    What are the advantages of going from a HO to a Seadoo pump? Apart from the HO pump being 155 and SD 159? Any other options?

  5. #5
    Steve-m31164's Avatar
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    I think just the availability of seadoo props /holeshot/ but loss of top speed ........but I'm probably wrong ....
    Quote Originally Posted by Sayers View Post
    Quote Originally Posted by westy View Post
    Quote Originally Posted by slociviccoupe View Post
    hub size. ho pump is larger diameter hub. also the gpr ho has a longer driveshaft with the 2" pump spacer.
    almost correct the 2 inch extension and shaft was fitted to the 03 GPR and 04 GPR with old small hub pump, the Ho pump came out in 05
    What are the advantages of going from a HO to a Seadoo pump? Apart from the HO pump being 155 and SD 159? Any other options?

  6. #6
    Sayers's Avatar
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    What year yammi pumps fit on them? Is there other options? (Sorry this is all new to me).

  7. #7
    westy's Avatar
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    All year gpr pumps fit a gpr
    Small hub pumps from 2000-2004
    Then large hub pumps from 2005-2008 large hub=ho pump
    Drive shafts are different lenghts though i cant remember the lengths but 2000 and 2002 are the same 2001 is different
    2003-2008 are the same and are used for 2 inch extension

  8. #8
    maybe dumb question but what hp and tq can either a yamaha or rotax pump hold? i know of a lot making estimated 400 hp but whats the tq? and would one of these pumpps be suitable for say a 300 hp honda 3.7l v6 in an 18' speed boat?? Im looking for a pump and dont want to max it out or hit a dead end not being able to get a prop big enough for it.

  9. #9
    Happily Self-Employed WFO's Avatar
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    2002 is the only oddball with a 28" drive shaft

    All other GPRs have a 30" driveshaft. They made up the difference with the intermediate shaft when they went with the 2" spacer

  10. #10
    westy's Avatar
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    Quote Originally Posted by WFO View Post
    2002 is the only oddball with a 28" drive shaft

    All other GPRs have a 30" driveshaft. They made up the difference with the intermediate shaft when they went with the 2" spacer
    Thanks for clearing that up Rich

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