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  1. #1
    Enufpwr's Avatar
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    May 2005
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    Lake St. Clair, Michigan
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    446

    Has anyone used Rotax Racing Valve Spring shims with the Riva Valve train kit?

    Has anyone used Rotax Racing Valve Spring shims with the Riva Valve train kit?

    Shims---
    http://www.4-tecperformance.com/inde...roducts_id=386

    Riva Valve train upgrade kit---
    http://www.4-tecperformance.com/inde...roducts_id=380

    I know we are not suppose to mix and match things, but I'm sure someone on the board has tried this to add a little extra security for valve float at high rpms.

    I know these shim go under the valve seals and was wondering if these would provide too much tension on the Riva valve springs and cause binding.

    I have a Riva Valve train kit that has 90hours on it and was thinking the shims might help gain back a little tension. I'm going to have the spring rates tested this week, but not sure what the stock tension values are and debating on replacing the springs.

    Application is RXPX at 8600rpms.

    Thanks


  2. #2
    Eric Ocman's Avatar
    Join Date
    Aug 2008
    Location
    Cataula, Georgia, United States
    Posts
    4,700
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    77
    I dont pretend to be more knowledgable than you but I thought most of us just dropped in the les cooke retainers?

    Just did this to mine and picked up a Riva ECU.

  3. #3
    Quote Originally Posted by Enufpwr View Post
    Has anyone used Rotax Racing Valve Spring shims with the Riva Valve train kit?

    Shims---
    http://www.4-tecperformance.com/inde...roducts_id=386

    Riva Valve train upgrade kit---
    http://www.4-tecperformance.com/inde...roducts_id=380

    I know we are not suppose to mix and match things, but I'm sure someone on the board has tried this to add a little extra security for valve float at high rpms.

    I know these shim go under the valve seals and was wondering if these would provide too much tension on the Riva valve springs and cause binding.

    I have a Riva Valve train kit that has 90hours on it and was thinking the shims might help gain back a little tension. I'm going to have the spring rates tested this week, but not sure what the stock tension values are and debating on replacing the springs.

    Application is RXPX at 8600rpms.

    Thanks
    I used them on my x ski with the big valves 9160rpm

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