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  1. #1
    Chine Walker
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    GPR 2005-08 exhuast upgrade. What results?

    Has anyone with pre 05 motors tried the 2005-08 pre stinger exhuast part as an option to increase HP for earlier skis?
    I'm talking about the section that cames after the 3 into 1 header section; the first part of the U shaped exhuast section.

    Thanks,
    jp


  2. #2
    philip_gpr's Avatar
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    I have one on my BB ski which uses fixed PVs, but I don't have any before and after test results using it.

    I am guessing Yamaha made this change to increase the HP below 5800 rpm to help compensate for the removal of the PVs.

    But they also gained 5 hp that year at peak rpm - I have no idea where this extra HP came from - I do know the 2005 cylinders in addition to not having PVs have different timing.

    Typically when Yamaha makes a change from one model year to another it provides an improvement - I would be very surprised if adding this exhaust pipe section to a pre 2005 ski didn't provide a HP gain somewhere in the power curve.

  3. #3
    Chine Walker
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    Time to search the classifieds. Any chance you have an extra?

    jp

  4. #4
    Chrisrokc's Avatar
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    I searched on this a while back. The exhaust part couldn't be found used since no one is selling their 2005+ single pipe setup for tripples. I also looked at the new cost and it was 255+ shipping. I decided to forget about it since it might have shown no gain. If you do this though and you see gain PLEASE let us know. No one has tried it last time I checked.

  5. #5
    Chine Walker
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    CR,
    I found out about this through R&D's website. I was calling about their "Power Sleeve", and that's when they told me about the 05+ part. I only saw it once on eBay new, but didn't jump on it.

    jp

  6. #6
    Chrisrokc's Avatar
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    Quote Originally Posted by jpa1300 View Post
    CR,
    I found out about this through R&D's website. I was calling about their "Power Sleeve", and that's when they told me about the 05+ part. I only saw it once on eBay new, but didn't jump on it.

    jp
    Did they say if they tried it or not? This would be interesting to hear!

  7. #7
    Chine Walker
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    Yes, they said the Power Sleeve/Tube gives the non PV motors the same mid range punch of the PV type motors; seems that the sleeve increases exhuast velocity and scavenging. I asked if there would be an improvement using the power sleeve on PV motors and of course the answer was yes; that's when the topic of replacing the pre stinger from the 2005+ came up. Apparently it will help the pre 2005 1300 motors.
    Last edited by jpa1300; 04-04-2008 at 04:55 AM.

  8. #8
    R1SideWayz's Avatar
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    Search over at pwctoday.com. There was someone who tried the power sleeve with the 05-08 header pipe section and he didn't notice any gains. He said it was a complete waste of $$$.

  9. #9
    Chrisrokc's Avatar
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    Quote Originally Posted by R1SideWayz View Post
    Search over at pwctoday.com. There was someone who tried the power sleeve with the 05-08 header pipe section and he didn't notice any gains. He said it was a complete waste of $$$.
    I have always heard that was a waist of cash also....

  10. #10
    Happily Self-Employed WFO's Avatar
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    I have an R&D sleeve if someone wants to test it.

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