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  1. #1
    just GOT TO DO IT! great lakes gpr 1200's Avatar
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    1200/ 1300 pump?

    What is the differnts between the 1200 and 1300 pump drives? can they be swapped?
    can I put a 2003 1300 jet pump on a 2002 1200? would it be worth buying( the 1300 pump) For interchange able parts? What is differnt?


  2. #2
    just GOT TO DO IT! great lakes gpr 1200's Avatar
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    see LOOK AT THIS: cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=4602082267

  3. #3
    ramnj's Avatar
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    I believe the difference is the addition of the impeller housing (2 inches). The rest of the parts are the same, at least according to the part numbers on boats.net..

  4. #4
    ABBOTT's Avatar
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    here is the post on the 2" extention.

    http://www.greenhulk.net/yamaha/viewtopic.php?t=338

    here is information on the parts conversion list.

    http://www.greenhulk.net/yamaha/viewtopic.php?t=486

    The 2005 and 2006 GPR's have an 87mm Diameter Pump also known as the "high pressure" pump

    2000-2004 i believe have the 85mm Diameter Pump

    2000-2002 GPRs do not have the 2" extension, but the 2002 has a shorter drive shaft for some reason. The year 2002 GP12R will NOT require intermmediate shaft, but will instead require the longer driveshaft.

    So to put this easier - 2002 and down do not have the 2" extention.
    2002 has the correct intermediatte shaft, but a shorter driveshaft.

    2000-2002 were 1200cc's w/85mm pumps and with powervalves / but no 2'' extention
    2003-2004 were 1300cc's w/85mm pumps and with powervalves (165hp) / with the 2'' extention / with lighter (SMC) hulls than 00-02.
    2005-2006 are 1300cc's w/87mm pumps and no powervalves (170hp) / with the 2'' extention / with lighter hulls than all models before.

  5. #5
    Quote Originally Posted by ABBOTT

    The 2005 and 2006 GPR's have an 87mm Diameter Pump also known as the "high pressure" pump

    2005-2006 are 1300cc's w/87mm pumps and no powervalves (170hp) / with the 2'' extention / with lighter hulls than all models before.
    All GP1300R's from 03-06 come with a 155mm pump and an 85.5 mm 5 degree exit nozzle!!!!!! The 05-06 uses a housing with a larger (75mm) hub than the 03-04 which pressurizes the water.

  6. #6
    ABBOTT's Avatar
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    oops, sorry about that. My bad.

  7. #7
    Moderator OsideBill's Avatar
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    What benefits can be expected by changing to the high pressure pump?
    I was under the impression that at some point they increased the driveshaft size also. Was this with the increased hub diameter in the 2005-2006 models?

    I have a 2002 with the 2" extension added and an 87mm reduction nozzle.

    Thanks,
    OsideBill

  8. #8
    Quote Originally Posted by osidebill
    What benefits can be expected by changing to the high pressure pump?
    I was under the impression that at some point they increased the driveshaft size also. Was this with the increased hub diameter in the 2005-2006 models?

    I have a 2002 with the 2" extension added and an 87mm reduction nozzle.

    Thanks,
    OsideBill
    You can bolt the 05' pump to your 02', all you need to change is the prop. You can expect a little more speed, if propped right and better hook up with less cavitation. The 02' comes with an 87mm exit nozzle and many recommend changing that to an 85mm. I'm currently using the 05' pump with the 87mm nozzle and it's working well. I have an 85mm nozzle on the way, we'll see how that works as many report an increase in speed with the 85.

  9. #9
    Moderator OsideBill's Avatar
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    So if I understand this I can use my existing driveshaft acquire an 05-06 pump with cone and swap out the internals? New prop would be to accomadate the benfits of the pump?

    Thanks,
    OsideBill

  10. #10
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by osidebill
    So if I understand this I can use my existing driveshaft acquire an 05-06 pump with cone and swap out the internals? New prop would be to accomadate the benfits of the pump?

    Thanks,
    OsideBill
    Yes you can use your driveshaft and swap internals. I strongly recommend not re-using the old bearings. Get yourself new bearings and seals. We have not been very sucessful re-using old bearings or seals.

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