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  1. #1
    It got WIFI and touchscreen ! PWCGUY's Avatar
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    Stock or Light Weight Valves for 9K

    I'm going through the motor on my RXP-X this winter installing a 3Rude, Motec ECU, Riva valve train upgrade and Riva pistons and rings. I would like to set rev limiter to 9K and was wondering if I needed light weight valves for this or will the stock valves work with Riva valve train upgrade. Any feedback would be helpful !


  2. #2
    Site Admin Green Hulk's Avatar
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    For 9000 RPM's you are definitely going to need the lightweight valves.

  3. #3
    Site Admin Green Hulk's Avatar
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    However, i do know of one instance where JD 1 ran stock weight valves with the Riva valve train upgrade and revved the ski 9000 RPM without issue.

    I wouldn't recommend this and I don't think Dan would take this chance again. It's just not worth it.

  4. #4
    It got WIFI and touchscreen ! PWCGUY's Avatar
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    Quote Originally Posted by Green Hulk View Post
    However, i do know of one instance where JD 1 ran stock weight valves with the Riva valve train upgrade and revved the ski 9000 RPM without issue.

    I wouldn't recommend this and I don't think Dan would take this chance again. It's just not worth it.

    Thanks for the feedback. I'll go with the lightweight valves. Motor only has 22 hrs on it.... can I just lap them in or would the seats need to be cut ?

  5. #5
    Site Admin Green Hulk's Avatar
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    I always bring the head to the machine shop to have the valves seated.

  6. #6
    Duke's Avatar
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    Seats have to be cut to the new valves.

    Anything over 9k needs lightweight valves. Have run 10,500 with lightened valves and Riva springs and retainers with no issue what so ever.

  7. #7
    REID2168's Avatar
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    my friend do yourself a BIG favor and send Erik/Speedfreek your head & stock valves and have him lighten the stock valves and three angle grind the valve seats to match the valves to the head ....................BINESS!!!!!!!!!!!!!

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  9. #9
    R88ory RXP's Avatar
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    Quote Originally Posted by REID2168 View Post
    my friend do yourself a BIG favor and send Erik/Speedfreek your head & stock valves and have him lighten the stock valves and three angle grind the valve seats to match the valves to the head ....................BINESS!!!!!!!!!!!!!
    +1 if your valves are in good condition this would be the way forward either have your valves lightened and do the work yourself or send it out to a pro such as Erik

    Les Cooke runs lightened stock valves in his engines upto 9200. The Ferrea Valves are good as well but having yours lightened will be cheaper.
    R88

  10. #10

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    Quote Originally Posted by Green Hulk View Post
    I always bring the head to the machine shop to have the valves seated.
    I think this is not true. If he replace valves he can do to pounce.

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