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  1. #1
    Mongoose's Avatar
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    Gpr exit nozzle clarification needed!

    I have a 05 gpr.
    Got my new digital calipers today, and they confirmed what I suspected.
    The exit nozzle diamiter is 85.5 mm, NOT 87mm!
    Everybody says the 05 skis and this year come with 87mm. NOT TRUE.
    People, you should accuratley check yours.
    What should it be to get the best from the Solas 14/20????
    Going to post at Riva as well, as they say the 05 skiis have 87mm


  2. #2
    Happily Self-Employed WFO's Avatar
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    Thats some bad info you have been getting. Stock 03,04,05,06 come with 85mm.

  3. #3
    ABBOTT's Avatar
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    That is true ---the 03,04,05,06 all come with 85mm "exit" nozzles, HOWEVER the pump diameter just in front of the exit nozz is larger ---hence the reason why its called a "high pressure" pump----larger diameter reducing down to the same size exit nozz as before.

    Just like a garden hose running ---then sticking a nozz on the end to make it shoot a stream.

  4. #4
    r33pwrd's Avatar
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    FYI calipers are NOT a good way to measure the ID of something! you need to use a bore gauge (and they are very expensive) im sure this is what lowell and the other guys use to measure the bore of cylinders as well. Ill measure mine and see what it is for you.

  5. #5
    Mongoose's Avatar
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    Yes, I think I've got it wrong
    Reread info on the Riva site regarding their staged kits, and they have edited it. They originally said the 05's come with a 87mm, but now say they are 85mm.
    Now, another problem>R&D say you need to change to the 87mm to get the revs back up when fitting the 14/20 Dynafly.
    Are you all doing that?

  6. #6
    Happily Self-Employed WFO's Avatar
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    Use the 85mm with the Dynafly.

  7. #7
    Fast1's Avatar
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    Quote Originally Posted by Mongoose
    Yes, I think I've got it wrong
    Reread info on the Riva site regarding their staged kits, and they have edited it. They originally said the 05's come with a 87mm, but now say they are 85mm.
    Now, another problem>R&D say you need to change to the 87mm to get the revs back up when fitting the 14/20 Dynafly.
    Are you all doing that?
    I've read and agred with what R&D indicate also. With a near stock engine you will need to ensure you are getting the proper rpms to avoid uneccessary load and failure.

  8. #8
    Moderator RX951's Avatar
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    FYI calipers are NOT a good way to measure the ID of something! you need to use a bore gauge (and they are very expensive) im sure this is what lowell and the other guys use to measure the bore of cylinders as well. Ill measure mine and see what it is for you.
    Calipers are great tool to have. For just checking the outer lip of the reduction nozzle, a caliper will do just fine, i.e.) 3>9 o/clock and 12>6 oclock.

    But for checking a cylinder, then yes a bore guage is appropriate as you need to measure the full perimeter top to bottom.

  9. #9
    r33pwrd's Avatar
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    You can use calipers for a very rough # but look at your calipers the to prongs for measuring the inside of two things are offset they can never measure at exact opposite sides IE 3 and 9 oclock this is splitting hairs but for a exact measurement of the nozzle calipers are not acurate.

  10. #10
    Moderator RX951's Avatar
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    For just checking the outer lip of the reduction nozzle

    for determining something quickly, it will do just fine




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