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  1. #1
    Mr. Millennium's Avatar
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    gp1200r triples slow top end

    i have a 2000 gp1200r that i took to the river to test it out and see how it would run i just put triple pipes on it it is ported and has jims plate and all stage 2 racing bolt ons cut r&D heads 165 psi compression and a 14/22 prop its turning 6500 rpms i rejetted carbs to 160 main and it is only running 65.8 mph its messed up what is wrong with it?


  2. #2
    Mr. Millennium's Avatar
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    now it shows about 130 psi per cylinder?????

  3. #3
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    Quote Originally Posted by Mr. Millennium View Post
    i have a 2000 gp1200r that i took to the river to test it out and see how it would run i just put triple pipes on it it is ported and has jims plate and all stage 2 racing bolt ons cut r&D heads 165 psi compression and a 14/23 prop its turning 6500 rpms i rejetted carbs to 160 main and it is only running 65.8 mph its messed up what is wrong with it?
    too tall of a prop 13/19
    missing a ton of rpm for a triple piper - real tach or dreamometer tach ??
    stock ignition or ??

  4. #4
    Moderator beerdart's Avatar
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    What ignition are you running? you are way low on the RRR''ss..

  5. #5

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    I've said before on another of your post. Your prop is way too big. Needs to be turning 7800rpm+
    Also that is a huge main jet. I bet its way rich. But I would change prop first.

  6. #6
    Mr. Millennium's Avatar
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    looks like im gonna have to run a 13/19 even though it was pretty fast with a 12/18

  7. #7
    PolarisNut's Avatar
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    Why don't you start one thread and put everything for your build in there, that way we can keep track of what you have/have not done. No doubt about it, that prop is too tall. 13/19 Concord. Your RPM is down more than it should be though, even with a 14/22. You should be able to turn a 14/22 at 7500, I'd think. Ronn is right, the main jet is wayy big. I'm running a 160 in my 48 Novis, but that is because of the booster design. Are you sure the pipes aren't leaking? Did you do a pressure test on them? Compression sounds low, but it could be the gauge.

  8. #8
    Crash Test Dummy Smitty's Avatar
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    Make sure the parking brake isn't on also.... that gets me every time.

  9. #9
    mudslanger's Avatar
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    Quote Originally Posted by Smitty View Post
    Make sure the parking brake isn't on also.... that gets me every time.

    LOL parking brake

    Hey Brad the next time we go riding ill bring a tow rope and hook it behind my single piper well get you up there some how. HA HA HA HA HA Just kidding (jets prop and turning some screws) Should do the trick.

  10. #10
    Mr. Millennium's Avatar
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