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Thread: R&D Powervalves

  1. #1
    Chrisrokc's Avatar
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    R&D Powervalves

    Does anyone use these? They claim it ups the compression slightly. I am thinking about swapping to them just to give them a try. That and they will never break.





    The new R&D Billet Exhaust Valves reduce the clearance between the valve and piston. This reduced clearance improves the seal which boosts the valve down compression ratio delivering greater bottom and mid range power. The billet engineered design is a direct performance bolt-on, guaranteed to never break in any application. Now being used by Factory Yamaha Racing.


  2. #2
    flyboy's Avatar
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    Kep what you have, no need for these.

  3. #3
    I run them. I haven't checked for a compression increase. They work, and they won't break. That's about all I can say

  4. #4
    Chrisrokc's Avatar
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    Quote Originally Posted by NateGP1300R View Post
    I run them. I haven't checked for a compression increase. They work, and they won't break. That's about all I can say
    What is your compression? Elevation? Milled or Aftermarket head and what psi is it?

  5. #5
    slydogge's Avatar
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    Is there any other good replacement valve? or are these about it?

  6. #6
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by slydogge View Post
    Is there any other good replacement valve? or are these about it?
    these are about it for electric operated valves

  7. #7
    vomitspot's Avatar
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    ive put in several sets for peeps never any failures
    never herd of the comp increase
    jason

  8. #8
    what would you guys reccomend out of these and gas vavles? mostly reliabilty wise.

  9. #9

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    Quote Originally Posted by jplowman2005 View Post
    what would you guys reccomend out of these and gas vavles? mostly reliabilty wise.
    I would say gas valves!! theres just not as many things to go wrong!! no servo,no cables, no shafts, no seals i think you can see my point. not saying the R&D`s arent good valves but just a lot more moving parts!!! Oh`` and they can break maybe just not as soon as the stock ones.

  10. #10
    African-American
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    power valves are better than gas operated for performance.

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