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  1. #1
    Turbonut's Avatar
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    Ferrea valve upgrade

    Hi,
    Can I use Ferrea valves with Riva retainers and standard springs?? The workhop told me there was a 10 pound seat pressure drop when using this combination.
    I am not looking for high RPM, maybe 8400 one day. Just doing this for reliabilty while I have the head off.
    Any info would greatly appreciated
    Thanks


  2. #2
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    You're good to go...

    I use Ferrea valves, slightly used 06 stock springs, and Les Cooke retainers...Thats a decent combo good to 8800ish, but me staying stock ECU...

  3. #3
    Turbonut's Avatar
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    Quote Originally Posted by Danny View Post
    You're good to go...

    I use Ferrea valves, slightly used 06 stock springs, and Les Cooke retainers...Thats a decent combo good to 8800ish, but me staying stock ECU...
    Thanks Danny, do u know if there is a difference between Riva and Les Cooke retainers? Did u check any difference in spring tension when you changed yours? Lower spring tension means lower valve float RPM doesn't it? I know lighter valves and retainers will help this, I just don't want this to end in a dropped valve!!

  4. #4
    Eric Ocman's Avatar
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    Quote Originally Posted by Danny View Post
    You're good to go...

    I use Ferrea valves, slightly used 06 stock springs, and Les Cooke retainers...Thats a decent combo good to 8800ish, but me staying stock ECU...
    People are turning 9200+ with stock valves and just the riva valvetrain upgrade with no issues.

  5. #5
    richrxp's Avatar
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    I have to disagree on this one,it's like playing with fire running at those high rpm's without the light weight valves.

    Read the thread:http://www.greenhulk.net/forums/show...ight=rotax+ecu



    Quote Originally Posted by Ocman View Post
    People are turning 9200+ with stock valves and just the riva valvetrain upgrade with no issues.

  6. #6
    Quote Originally Posted by Ocman View Post
    People are turning 9200+ with stock valves and just the riva valvetrain upgrade with no issues.
    I'm 100% sure that the stock intake valves are floating at 9200 with just the Riva valvetrain.

  7. #7
    Eric Ocman's Avatar
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    The skis that I know that are doing this have not had any issues at all that im aware of and they have 50 hours or more on these setups. Not saying it's ideal but just that it appears to be working well.

  8. #8
    richrxp's Avatar
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    Is this on flat water?
    In heavy chop this might give problems,i was thinking of running rotax 8800 ecu,with only the Riva valvetrain upgrade,but after reading a lot i just dont want to take the risk.
    Now i have the rotax 8600 ecu,i was thinking of upgrading,but i dont want to pull the head off.
    But i believe that some are running without any issues.
    But then again,some had troubles also.



    Quote Originally Posted by Ocman View Post
    The skis that I know that are doing this have not had any issues at all that im aware of and they have 50 hours or more on these setups. Not saying it's ideal but just that it appears to be working well.

  9. #9
    Eric Ocman's Avatar
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    Yes, flat water but also chop at times.

  10. #10

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    I would have to agree with the others on this Ocman. 9200+ rpm on stock valves and Riva valve train upgrade is begging for trouble. It is not a matter of "if" but "when" will it blow up.

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